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32d0add0a6
gdb/ChangeLog: Update year range in copyright notice of all files.
1644 lines
52 KiB
C
1644 lines
52 KiB
C
/* GNU/Linux on ARM target support.
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Copyright (C) 1999-2015 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "target.h"
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#include "value.h"
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#include "gdbtypes.h"
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#include "floatformat.h"
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#include "gdbcore.h"
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#include "frame.h"
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#include "regcache.h"
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#include "doublest.h"
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#include "solib-svr4.h"
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#include "osabi.h"
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#include "regset.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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#include "breakpoint.h"
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#include "auxv.h"
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#include "xml-syscall.h"
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#include "arm-tdep.h"
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#include "arm-linux-tdep.h"
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#include "linux-tdep.h"
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#include "glibc-tdep.h"
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#include "arch-utils.h"
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#include "inferior.h"
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#include "infrun.h"
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#include "gdbthread.h"
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#include "symfile.h"
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#include "record-full.h"
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#include "linux-record.h"
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#include "cli/cli-utils.h"
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#include "stap-probe.h"
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#include "parser-defs.h"
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#include "user-regs.h"
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#include <ctype.h>
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#include "elf/common.h"
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extern int arm_apcs_32;
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/* Under ARM GNU/Linux the traditional way of performing a breakpoint
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is to execute a particular software interrupt, rather than use a
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particular undefined instruction to provoke a trap. Upon exection
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of the software interrupt the kernel stops the inferior with a
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SIGTRAP, and wakes the debugger. */
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static const gdb_byte arm_linux_arm_le_breakpoint[] = { 0x01, 0x00, 0x9f, 0xef };
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static const gdb_byte arm_linux_arm_be_breakpoint[] = { 0xef, 0x9f, 0x00, 0x01 };
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/* However, the EABI syscall interface (new in Nov. 2005) does not look at
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the operand of the swi if old-ABI compatibility is disabled. Therefore,
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use an undefined instruction instead. This is supported as of kernel
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version 2.5.70 (May 2003), so should be a safe assumption for EABI
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binaries. */
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static const gdb_byte eabi_linux_arm_le_breakpoint[] = { 0xf0, 0x01, 0xf0, 0xe7 };
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static const gdb_byte eabi_linux_arm_be_breakpoint[] = { 0xe7, 0xf0, 0x01, 0xf0 };
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/* All the kernels which support Thumb support using a specific undefined
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instruction for the Thumb breakpoint. */
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static const gdb_byte arm_linux_thumb_be_breakpoint[] = {0xde, 0x01};
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static const gdb_byte arm_linux_thumb_le_breakpoint[] = {0x01, 0xde};
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/* Because the 16-bit Thumb breakpoint is affected by Thumb-2 IT blocks,
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we must use a length-appropriate breakpoint for 32-bit Thumb
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instructions. See also thumb_get_next_pc. */
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static const gdb_byte arm_linux_thumb2_be_breakpoint[] = { 0xf7, 0xf0, 0xa0, 0x00 };
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static const gdb_byte arm_linux_thumb2_le_breakpoint[] = { 0xf0, 0xf7, 0x00, 0xa0 };
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/* Description of the longjmp buffer. The buffer is treated as an array of
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elements of size ARM_LINUX_JB_ELEMENT_SIZE.
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The location of saved registers in this buffer (in particular the PC
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to use after longjmp is called) varies depending on the ABI (in
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particular the FP model) and also (possibly) the C Library.
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For glibc, eglibc, and uclibc the following holds: If the FP model is
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SoftVFP or VFP (which implies EABI) then the PC is at offset 9 in the
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buffer. This is also true for the SoftFPA model. However, for the FPA
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model the PC is at offset 21 in the buffer. */
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#define ARM_LINUX_JB_ELEMENT_SIZE INT_REGISTER_SIZE
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#define ARM_LINUX_JB_PC_FPA 21
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#define ARM_LINUX_JB_PC_EABI 9
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/*
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Dynamic Linking on ARM GNU/Linux
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--------------------------------
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Note: PLT = procedure linkage table
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GOT = global offset table
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As much as possible, ELF dynamic linking defers the resolution of
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jump/call addresses until the last minute. The technique used is
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inspired by the i386 ELF design, and is based on the following
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constraints.
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1) The calling technique should not force a change in the assembly
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code produced for apps; it MAY cause changes in the way assembly
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code is produced for position independent code (i.e. shared
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libraries).
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2) The technique must be such that all executable areas must not be
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modified; and any modified areas must not be executed.
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To do this, there are three steps involved in a typical jump:
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1) in the code
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2) through the PLT
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3) using a pointer from the GOT
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When the executable or library is first loaded, each GOT entry is
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initialized to point to the code which implements dynamic name
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resolution and code finding. This is normally a function in the
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program interpreter (on ARM GNU/Linux this is usually
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ld-linux.so.2, but it does not have to be). On the first
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invocation, the function is located and the GOT entry is replaced
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with the real function address. Subsequent calls go through steps
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1, 2 and 3 and end up calling the real code.
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1) In the code:
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b function_call
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bl function_call
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This is typical ARM code using the 26 bit relative branch or branch
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and link instructions. The target of the instruction
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(function_call is usually the address of the function to be called.
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In position independent code, the target of the instruction is
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actually an entry in the PLT when calling functions in a shared
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library. Note that this call is identical to a normal function
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call, only the target differs.
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2) In the PLT:
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The PLT is a synthetic area, created by the linker. It exists in
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both executables and libraries. It is an array of stubs, one per
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imported function call. It looks like this:
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PLT[0]:
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str lr, [sp, #-4]! @push the return address (lr)
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ldr lr, [pc, #16] @load from 6 words ahead
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add lr, pc, lr @form an address for GOT[0]
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ldr pc, [lr, #8]! @jump to the contents of that addr
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The return address (lr) is pushed on the stack and used for
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calculations. The load on the second line loads the lr with
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&GOT[3] - . - 20. The addition on the third leaves:
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lr = (&GOT[3] - . - 20) + (. + 8)
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lr = (&GOT[3] - 12)
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lr = &GOT[0]
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On the fourth line, the pc and lr are both updated, so that:
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pc = GOT[2]
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lr = &GOT[0] + 8
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= &GOT[2]
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NOTE: PLT[0] borrows an offset .word from PLT[1]. This is a little
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"tight", but allows us to keep all the PLT entries the same size.
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PLT[n+1]:
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ldr ip, [pc, #4] @load offset from gotoff
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add ip, pc, ip @add the offset to the pc
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ldr pc, [ip] @jump to that address
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gotoff: .word GOT[n+3] - .
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The load on the first line, gets an offset from the fourth word of
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the PLT entry. The add on the second line makes ip = &GOT[n+3],
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which contains either a pointer to PLT[0] (the fixup trampoline) or
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a pointer to the actual code.
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3) In the GOT:
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The GOT contains helper pointers for both code (PLT) fixups and
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data fixups. The first 3 entries of the GOT are special. The next
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M entries (where M is the number of entries in the PLT) belong to
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the PLT fixups. The next D (all remaining) entries belong to
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various data fixups. The actual size of the GOT is 3 + M + D.
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The GOT is also a synthetic area, created by the linker. It exists
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in both executables and libraries. When the GOT is first
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initialized , all the GOT entries relating to PLT fixups are
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pointing to code back at PLT[0].
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The special entries in the GOT are:
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GOT[0] = linked list pointer used by the dynamic loader
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GOT[1] = pointer to the reloc table for this module
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GOT[2] = pointer to the fixup/resolver code
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The first invocation of function call comes through and uses the
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fixup/resolver code. On the entry to the fixup/resolver code:
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ip = &GOT[n+3]
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lr = &GOT[2]
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stack[0] = return address (lr) of the function call
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[r0, r1, r2, r3] are still the arguments to the function call
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This is enough information for the fixup/resolver code to work
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with. Before the fixup/resolver code returns, it actually calls
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the requested function and repairs &GOT[n+3]. */
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/* The constants below were determined by examining the following files
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in the linux kernel sources:
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arch/arm/kernel/signal.c
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- see SWI_SYS_SIGRETURN and SWI_SYS_RT_SIGRETURN
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include/asm-arm/unistd.h
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- see __NR_sigreturn, __NR_rt_sigreturn, and __NR_SYSCALL_BASE */
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#define ARM_LINUX_SIGRETURN_INSTR 0xef900077
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#define ARM_LINUX_RT_SIGRETURN_INSTR 0xef9000ad
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/* For ARM EABI, the syscall number is not in the SWI instruction
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(instead it is loaded into r7). We recognize the pattern that
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glibc uses... alternatively, we could arrange to do this by
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function name, but they are not always exported. */
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#define ARM_SET_R7_SIGRETURN 0xe3a07077
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#define ARM_SET_R7_RT_SIGRETURN 0xe3a070ad
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#define ARM_EABI_SYSCALL 0xef000000
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/* Equivalent patterns for Thumb2. */
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#define THUMB2_SET_R7_SIGRETURN1 0xf04f
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#define THUMB2_SET_R7_SIGRETURN2 0x0777
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#define THUMB2_SET_R7_RT_SIGRETURN1 0xf04f
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#define THUMB2_SET_R7_RT_SIGRETURN2 0x07ad
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#define THUMB2_EABI_SYSCALL 0xdf00
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/* OABI syscall restart trampoline, used for EABI executables too
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whenever OABI support has been enabled in the kernel. */
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#define ARM_OABI_SYSCALL_RESTART_SYSCALL 0xef900000
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#define ARM_LDR_PC_SP_12 0xe49df00c
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#define ARM_LDR_PC_SP_4 0xe49df004
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static void
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arm_linux_sigtramp_cache (struct frame_info *this_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func, int regs_offset)
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{
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CORE_ADDR sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM);
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CORE_ADDR base = sp + regs_offset;
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int i;
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for (i = 0; i < 16; i++)
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trad_frame_set_reg_addr (this_cache, i, base + i * 4);
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trad_frame_set_reg_addr (this_cache, ARM_PS_REGNUM, base + 16 * 4);
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/* The VFP or iWMMXt registers may be saved on the stack, but there's
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no reliable way to restore them (yet). */
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/* Save a frame ID. */
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trad_frame_set_id (this_cache, frame_id_build (sp, func));
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}
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/* There are a couple of different possible stack layouts that
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we need to support.
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Before version 2.6.18, the kernel used completely independent
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layouts for non-RT and RT signals. For non-RT signals the stack
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began directly with a struct sigcontext. For RT signals the stack
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began with two redundant pointers (to the siginfo and ucontext),
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and then the siginfo and ucontext.
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As of version 2.6.18, the non-RT signal frame layout starts with
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a ucontext and the RT signal frame starts with a siginfo and then
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a ucontext. Also, the ucontext now has a designated save area
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for coprocessor registers.
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For RT signals, it's easy to tell the difference: we look for
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pinfo, the pointer to the siginfo. If it has the expected
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value, we have an old layout. If it doesn't, we have the new
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layout.
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For non-RT signals, it's a bit harder. We need something in one
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layout or the other with a recognizable offset and value. We can't
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use the return trampoline, because ARM usually uses SA_RESTORER,
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in which case the stack return trampoline is not filled in.
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We can't use the saved stack pointer, because sigaltstack might
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be in use. So for now we guess the new layout... */
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/* There are three words (trap_no, error_code, oldmask) in
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struct sigcontext before r0. */
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#define ARM_SIGCONTEXT_R0 0xc
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/* There are five words (uc_flags, uc_link, and three for uc_stack)
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in the ucontext_t before the sigcontext. */
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#define ARM_UCONTEXT_SIGCONTEXT 0x14
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/* There are three elements in an rt_sigframe before the ucontext:
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pinfo, puc, and info. The first two are pointers and the third
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is a struct siginfo, with size 128 bytes. We could follow puc
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to the ucontext, but it's simpler to skip the whole thing. */
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#define ARM_OLD_RT_SIGFRAME_SIGINFO 0x8
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#define ARM_OLD_RT_SIGFRAME_UCONTEXT 0x88
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#define ARM_NEW_RT_SIGFRAME_UCONTEXT 0x80
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#define ARM_NEW_SIGFRAME_MAGIC 0x5ac3c35a
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static void
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arm_linux_sigreturn_init (const struct tramp_frame *self,
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struct frame_info *this_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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CORE_ADDR sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM);
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ULONGEST uc_flags = read_memory_unsigned_integer (sp, 4, byte_order);
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if (uc_flags == ARM_NEW_SIGFRAME_MAGIC)
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arm_linux_sigtramp_cache (this_frame, this_cache, func,
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ARM_UCONTEXT_SIGCONTEXT
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+ ARM_SIGCONTEXT_R0);
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else
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arm_linux_sigtramp_cache (this_frame, this_cache, func,
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ARM_SIGCONTEXT_R0);
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}
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static void
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arm_linux_rt_sigreturn_init (const struct tramp_frame *self,
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struct frame_info *this_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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CORE_ADDR sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM);
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ULONGEST pinfo = read_memory_unsigned_integer (sp, 4, byte_order);
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if (pinfo == sp + ARM_OLD_RT_SIGFRAME_SIGINFO)
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arm_linux_sigtramp_cache (this_frame, this_cache, func,
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ARM_OLD_RT_SIGFRAME_UCONTEXT
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+ ARM_UCONTEXT_SIGCONTEXT
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+ ARM_SIGCONTEXT_R0);
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else
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arm_linux_sigtramp_cache (this_frame, this_cache, func,
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ARM_NEW_RT_SIGFRAME_UCONTEXT
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+ ARM_UCONTEXT_SIGCONTEXT
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+ ARM_SIGCONTEXT_R0);
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}
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static void
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arm_linux_restart_syscall_init (const struct tramp_frame *self,
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struct frame_info *this_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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CORE_ADDR sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM);
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CORE_ADDR pc = get_frame_memory_unsigned (this_frame, sp, 4);
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CORE_ADDR cpsr = get_frame_register_unsigned (this_frame, ARM_PS_REGNUM);
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ULONGEST t_bit = arm_psr_thumb_bit (gdbarch);
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int sp_offset;
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/* There are two variants of this trampoline; with older kernels, the
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stub is placed on the stack, while newer kernels use the stub from
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the vector page. They are identical except that the older version
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increments SP by 12 (to skip stored PC and the stub itself), while
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the newer version increments SP only by 4 (just the stored PC). */
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if (self->insn[1].bytes == ARM_LDR_PC_SP_4)
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sp_offset = 4;
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else
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sp_offset = 12;
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/* Update Thumb bit in CPSR. */
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if (pc & 1)
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cpsr |= t_bit;
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else
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cpsr &= ~t_bit;
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/* Remove Thumb bit from PC. */
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pc = gdbarch_addr_bits_remove (gdbarch, pc);
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/* Save previous register values. */
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trad_frame_set_reg_value (this_cache, ARM_SP_REGNUM, sp + sp_offset);
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trad_frame_set_reg_value (this_cache, ARM_PC_REGNUM, pc);
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trad_frame_set_reg_value (this_cache, ARM_PS_REGNUM, cpsr);
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/* Save a frame ID. */
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trad_frame_set_id (this_cache, frame_id_build (sp, func));
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}
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static struct tramp_frame arm_linux_sigreturn_tramp_frame = {
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SIGTRAMP_FRAME,
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4,
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{
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{ ARM_LINUX_SIGRETURN_INSTR, -1 },
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{ TRAMP_SENTINEL_INSN }
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},
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arm_linux_sigreturn_init
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};
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static struct tramp_frame arm_linux_rt_sigreturn_tramp_frame = {
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SIGTRAMP_FRAME,
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4,
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{
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{ ARM_LINUX_RT_SIGRETURN_INSTR, -1 },
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{ TRAMP_SENTINEL_INSN }
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},
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arm_linux_rt_sigreturn_init
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};
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static struct tramp_frame arm_eabi_linux_sigreturn_tramp_frame = {
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SIGTRAMP_FRAME,
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4,
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{
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{ ARM_SET_R7_SIGRETURN, -1 },
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{ ARM_EABI_SYSCALL, -1 },
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{ TRAMP_SENTINEL_INSN }
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},
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arm_linux_sigreturn_init
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};
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static struct tramp_frame arm_eabi_linux_rt_sigreturn_tramp_frame = {
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SIGTRAMP_FRAME,
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4,
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{
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{ ARM_SET_R7_RT_SIGRETURN, -1 },
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{ ARM_EABI_SYSCALL, -1 },
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{ TRAMP_SENTINEL_INSN }
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},
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arm_linux_rt_sigreturn_init
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};
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static struct tramp_frame thumb2_eabi_linux_sigreturn_tramp_frame = {
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SIGTRAMP_FRAME,
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2,
|
|
{
|
|
{ THUMB2_SET_R7_SIGRETURN1, -1 },
|
|
{ THUMB2_SET_R7_SIGRETURN2, -1 },
|
|
{ THUMB2_EABI_SYSCALL, -1 },
|
|
{ TRAMP_SENTINEL_INSN }
|
|
},
|
|
arm_linux_sigreturn_init
|
|
};
|
|
|
|
static struct tramp_frame thumb2_eabi_linux_rt_sigreturn_tramp_frame = {
|
|
SIGTRAMP_FRAME,
|
|
2,
|
|
{
|
|
{ THUMB2_SET_R7_RT_SIGRETURN1, -1 },
|
|
{ THUMB2_SET_R7_RT_SIGRETURN2, -1 },
|
|
{ THUMB2_EABI_SYSCALL, -1 },
|
|
{ TRAMP_SENTINEL_INSN }
|
|
},
|
|
arm_linux_rt_sigreturn_init
|
|
};
|
|
|
|
static struct tramp_frame arm_linux_restart_syscall_tramp_frame = {
|
|
NORMAL_FRAME,
|
|
4,
|
|
{
|
|
{ ARM_OABI_SYSCALL_RESTART_SYSCALL, -1 },
|
|
{ ARM_LDR_PC_SP_12, -1 },
|
|
{ TRAMP_SENTINEL_INSN }
|
|
},
|
|
arm_linux_restart_syscall_init
|
|
};
|
|
|
|
static struct tramp_frame arm_kernel_linux_restart_syscall_tramp_frame = {
|
|
NORMAL_FRAME,
|
|
4,
|
|
{
|
|
{ ARM_OABI_SYSCALL_RESTART_SYSCALL, -1 },
|
|
{ ARM_LDR_PC_SP_4, -1 },
|
|
{ TRAMP_SENTINEL_INSN }
|
|
},
|
|
arm_linux_restart_syscall_init
|
|
};
|
|
|
|
/* Core file and register set support. */
|
|
|
|
#define ARM_LINUX_SIZEOF_GREGSET (18 * INT_REGISTER_SIZE)
|
|
|
|
void
|
|
arm_linux_supply_gregset (const struct regset *regset,
|
|
struct regcache *regcache,
|
|
int regnum, const void *gregs_buf, size_t len)
|
|
{
|
|
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
const gdb_byte *gregs = gregs_buf;
|
|
int regno;
|
|
CORE_ADDR reg_pc;
|
|
gdb_byte pc_buf[INT_REGISTER_SIZE];
|
|
|
|
for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++)
|
|
if (regnum == -1 || regnum == regno)
|
|
regcache_raw_supply (regcache, regno,
|
|
gregs + INT_REGISTER_SIZE * regno);
|
|
|
|
if (regnum == ARM_PS_REGNUM || regnum == -1)
|
|
{
|
|
if (arm_apcs_32)
|
|
regcache_raw_supply (regcache, ARM_PS_REGNUM,
|
|
gregs + INT_REGISTER_SIZE * ARM_CPSR_GREGNUM);
|
|
else
|
|
regcache_raw_supply (regcache, ARM_PS_REGNUM,
|
|
gregs + INT_REGISTER_SIZE * ARM_PC_REGNUM);
|
|
}
|
|
|
|
if (regnum == ARM_PC_REGNUM || regnum == -1)
|
|
{
|
|
reg_pc = extract_unsigned_integer (gregs
|
|
+ INT_REGISTER_SIZE * ARM_PC_REGNUM,
|
|
INT_REGISTER_SIZE, byte_order);
|
|
reg_pc = gdbarch_addr_bits_remove (gdbarch, reg_pc);
|
|
store_unsigned_integer (pc_buf, INT_REGISTER_SIZE, byte_order, reg_pc);
|
|
regcache_raw_supply (regcache, ARM_PC_REGNUM, pc_buf);
|
|
}
|
|
}
|
|
|
|
void
|
|
arm_linux_collect_gregset (const struct regset *regset,
|
|
const struct regcache *regcache,
|
|
int regnum, void *gregs_buf, size_t len)
|
|
{
|
|
gdb_byte *gregs = gregs_buf;
|
|
int regno;
|
|
|
|
for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++)
|
|
if (regnum == -1 || regnum == regno)
|
|
regcache_raw_collect (regcache, regno,
|
|
gregs + INT_REGISTER_SIZE * regno);
|
|
|
|
if (regnum == ARM_PS_REGNUM || regnum == -1)
|
|
{
|
|
if (arm_apcs_32)
|
|
regcache_raw_collect (regcache, ARM_PS_REGNUM,
|
|
gregs + INT_REGISTER_SIZE * ARM_CPSR_GREGNUM);
|
|
else
|
|
regcache_raw_collect (regcache, ARM_PS_REGNUM,
|
|
gregs + INT_REGISTER_SIZE * ARM_PC_REGNUM);
|
|
}
|
|
|
|
if (regnum == ARM_PC_REGNUM || regnum == -1)
|
|
regcache_raw_collect (regcache, ARM_PC_REGNUM,
|
|
gregs + INT_REGISTER_SIZE * ARM_PC_REGNUM);
|
|
}
|
|
|
|
/* Support for register format used by the NWFPE FPA emulator. */
|
|
|
|
#define typeNone 0x00
|
|
#define typeSingle 0x01
|
|
#define typeDouble 0x02
|
|
#define typeExtended 0x03
|
|
|
|
void
|
|
supply_nwfpe_register (struct regcache *regcache, int regno,
|
|
const gdb_byte *regs)
|
|
{
|
|
const gdb_byte *reg_data;
|
|
gdb_byte reg_tag;
|
|
gdb_byte buf[FP_REGISTER_SIZE];
|
|
|
|
reg_data = regs + (regno - ARM_F0_REGNUM) * FP_REGISTER_SIZE;
|
|
reg_tag = regs[(regno - ARM_F0_REGNUM) + NWFPE_TAGS_OFFSET];
|
|
memset (buf, 0, FP_REGISTER_SIZE);
|
|
|
|
switch (reg_tag)
|
|
{
|
|
case typeSingle:
|
|
memcpy (buf, reg_data, 4);
|
|
break;
|
|
case typeDouble:
|
|
memcpy (buf, reg_data + 4, 4);
|
|
memcpy (buf + 4, reg_data, 4);
|
|
break;
|
|
case typeExtended:
|
|
/* We want sign and exponent, then least significant bits,
|
|
then most significant. NWFPE does sign, most, least. */
|
|
memcpy (buf, reg_data, 4);
|
|
memcpy (buf + 4, reg_data + 8, 4);
|
|
memcpy (buf + 8, reg_data + 4, 4);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
regcache_raw_supply (regcache, regno, buf);
|
|
}
|
|
|
|
void
|
|
collect_nwfpe_register (const struct regcache *regcache, int regno,
|
|
gdb_byte *regs)
|
|
{
|
|
gdb_byte *reg_data;
|
|
gdb_byte reg_tag;
|
|
gdb_byte buf[FP_REGISTER_SIZE];
|
|
|
|
regcache_raw_collect (regcache, regno, buf);
|
|
|
|
/* NOTE drow/2006-06-07: This code uses the tag already in the
|
|
register buffer. I've preserved that when moving the code
|
|
from the native file to the target file. But this doesn't
|
|
always make sense. */
|
|
|
|
reg_data = regs + (regno - ARM_F0_REGNUM) * FP_REGISTER_SIZE;
|
|
reg_tag = regs[(regno - ARM_F0_REGNUM) + NWFPE_TAGS_OFFSET];
|
|
|
|
switch (reg_tag)
|
|
{
|
|
case typeSingle:
|
|
memcpy (reg_data, buf, 4);
|
|
break;
|
|
case typeDouble:
|
|
memcpy (reg_data, buf + 4, 4);
|
|
memcpy (reg_data + 4, buf, 4);
|
|
break;
|
|
case typeExtended:
|
|
memcpy (reg_data, buf, 4);
|
|
memcpy (reg_data + 4, buf + 8, 4);
|
|
memcpy (reg_data + 8, buf + 4, 4);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
arm_linux_supply_nwfpe (const struct regset *regset,
|
|
struct regcache *regcache,
|
|
int regnum, const void *regs_buf, size_t len)
|
|
{
|
|
const gdb_byte *regs = regs_buf;
|
|
int regno;
|
|
|
|
if (regnum == ARM_FPS_REGNUM || regnum == -1)
|
|
regcache_raw_supply (regcache, ARM_FPS_REGNUM,
|
|
regs + NWFPE_FPSR_OFFSET);
|
|
|
|
for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
|
|
if (regnum == -1 || regnum == regno)
|
|
supply_nwfpe_register (regcache, regno, regs);
|
|
}
|
|
|
|
void
|
|
arm_linux_collect_nwfpe (const struct regset *regset,
|
|
const struct regcache *regcache,
|
|
int regnum, void *regs_buf, size_t len)
|
|
{
|
|
gdb_byte *regs = regs_buf;
|
|
int regno;
|
|
|
|
for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
|
|
if (regnum == -1 || regnum == regno)
|
|
collect_nwfpe_register (regcache, regno, regs);
|
|
|
|
if (regnum == ARM_FPS_REGNUM || regnum == -1)
|
|
regcache_raw_collect (regcache, ARM_FPS_REGNUM,
|
|
regs + INT_REGISTER_SIZE * ARM_FPS_REGNUM);
|
|
}
|
|
|
|
/* Support VFP register format. */
|
|
|
|
#define ARM_LINUX_SIZEOF_VFP (32 * 8 + 4)
|
|
|
|
static void
|
|
arm_linux_supply_vfp (const struct regset *regset,
|
|
struct regcache *regcache,
|
|
int regnum, const void *regs_buf, size_t len)
|
|
{
|
|
const gdb_byte *regs = regs_buf;
|
|
int regno;
|
|
|
|
if (regnum == ARM_FPSCR_REGNUM || regnum == -1)
|
|
regcache_raw_supply (regcache, ARM_FPSCR_REGNUM, regs + 32 * 8);
|
|
|
|
for (regno = ARM_D0_REGNUM; regno <= ARM_D31_REGNUM; regno++)
|
|
if (regnum == -1 || regnum == regno)
|
|
regcache_raw_supply (regcache, regno,
|
|
regs + (regno - ARM_D0_REGNUM) * 8);
|
|
}
|
|
|
|
static void
|
|
arm_linux_collect_vfp (const struct regset *regset,
|
|
const struct regcache *regcache,
|
|
int regnum, void *regs_buf, size_t len)
|
|
{
|
|
gdb_byte *regs = regs_buf;
|
|
int regno;
|
|
|
|
if (regnum == ARM_FPSCR_REGNUM || regnum == -1)
|
|
regcache_raw_collect (regcache, ARM_FPSCR_REGNUM, regs + 32 * 8);
|
|
|
|
for (regno = ARM_D0_REGNUM; regno <= ARM_D31_REGNUM; regno++)
|
|
if (regnum == -1 || regnum == regno)
|
|
regcache_raw_collect (regcache, regno,
|
|
regs + (regno - ARM_D0_REGNUM) * 8);
|
|
}
|
|
|
|
static const struct regset arm_linux_gregset =
|
|
{
|
|
NULL, arm_linux_supply_gregset, arm_linux_collect_gregset
|
|
};
|
|
|
|
static const struct regset arm_linux_fpregset =
|
|
{
|
|
NULL, arm_linux_supply_nwfpe, arm_linux_collect_nwfpe
|
|
};
|
|
|
|
static const struct regset arm_linux_vfpregset =
|
|
{
|
|
NULL, arm_linux_supply_vfp, arm_linux_collect_vfp
|
|
};
|
|
|
|
/* Iterate over core file register note sections. */
|
|
|
|
static void
|
|
arm_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
|
|
iterate_over_regset_sections_cb *cb,
|
|
void *cb_data,
|
|
const struct regcache *regcache)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
cb (".reg", ARM_LINUX_SIZEOF_GREGSET, &arm_linux_gregset, NULL, cb_data);
|
|
|
|
if (tdep->have_vfp_registers)
|
|
cb (".reg-arm-vfp", ARM_LINUX_SIZEOF_VFP, &arm_linux_vfpregset,
|
|
"VFP floating-point", cb_data);
|
|
else if (tdep->have_fpa_registers)
|
|
cb (".reg2", ARM_LINUX_SIZEOF_NWFPE, &arm_linux_fpregset,
|
|
"FPA floating-point", cb_data);
|
|
}
|
|
|
|
/* Determine target description from core file. */
|
|
|
|
static const struct target_desc *
|
|
arm_linux_core_read_description (struct gdbarch *gdbarch,
|
|
struct target_ops *target,
|
|
bfd *abfd)
|
|
{
|
|
CORE_ADDR arm_hwcap = 0;
|
|
|
|
if (target_auxv_search (target, AT_HWCAP, &arm_hwcap) != 1)
|
|
return NULL;
|
|
|
|
if (arm_hwcap & HWCAP_VFP)
|
|
{
|
|
/* NEON implies VFPv3-D32 or no-VFP unit. Say that we only support
|
|
Neon with VFPv3-D32. */
|
|
if (arm_hwcap & HWCAP_NEON)
|
|
return tdesc_arm_with_neon;
|
|
else if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
|
|
return tdesc_arm_with_vfpv3;
|
|
else
|
|
return tdesc_arm_with_vfpv2;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/* Copy the value of next pc of sigreturn and rt_sigrturn into PC,
|
|
return 1. In addition, set IS_THUMB depending on whether we
|
|
will return to ARM or Thumb code. Return 0 if it is not a
|
|
rt_sigreturn/sigreturn syscall. */
|
|
static int
|
|
arm_linux_sigreturn_return_addr (struct frame_info *frame,
|
|
unsigned long svc_number,
|
|
CORE_ADDR *pc, int *is_thumb)
|
|
{
|
|
/* Is this a sigreturn or rt_sigreturn syscall? */
|
|
if (svc_number == 119 || svc_number == 173)
|
|
{
|
|
if (get_frame_type (frame) == SIGTRAMP_FRAME)
|
|
{
|
|
ULONGEST t_bit = arm_psr_thumb_bit (frame_unwind_arch (frame));
|
|
CORE_ADDR cpsr
|
|
= frame_unwind_register_unsigned (frame, ARM_PS_REGNUM);
|
|
|
|
*is_thumb = (cpsr & t_bit) != 0;
|
|
*pc = frame_unwind_caller_pc (frame);
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* At a ptrace syscall-stop, return the syscall number. This either
|
|
comes from the SWI instruction (OABI) or from r7 (EABI).
|
|
|
|
When the function fails, it should return -1. */
|
|
|
|
static LONGEST
|
|
arm_linux_get_syscall_number (struct gdbarch *gdbarch,
|
|
ptid_t ptid)
|
|
{
|
|
struct regcache *regs = get_thread_regcache (ptid);
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
ULONGEST pc;
|
|
ULONGEST cpsr;
|
|
ULONGEST t_bit = arm_psr_thumb_bit (gdbarch);
|
|
int is_thumb;
|
|
ULONGEST svc_number = -1;
|
|
|
|
regcache_cooked_read_unsigned (regs, ARM_PC_REGNUM, &pc);
|
|
regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &cpsr);
|
|
is_thumb = (cpsr & t_bit) != 0;
|
|
|
|
if (is_thumb)
|
|
{
|
|
regcache_cooked_read_unsigned (regs, 7, &svc_number);
|
|
}
|
|
else
|
|
{
|
|
enum bfd_endian byte_order_for_code =
|
|
gdbarch_byte_order_for_code (gdbarch);
|
|
|
|
/* PC gets incremented before the syscall-stop, so read the
|
|
previous instruction. */
|
|
unsigned long this_instr =
|
|
read_memory_unsigned_integer (pc - 4, 4, byte_order_for_code);
|
|
|
|
unsigned long svc_operand = (0x00ffffff & this_instr);
|
|
|
|
if (svc_operand)
|
|
{
|
|
/* OABI */
|
|
svc_number = svc_operand - 0x900000;
|
|
}
|
|
else
|
|
{
|
|
/* EABI */
|
|
regcache_cooked_read_unsigned (regs, 7, &svc_number);
|
|
}
|
|
}
|
|
|
|
return svc_number;
|
|
}
|
|
|
|
/* When FRAME is at a syscall instruction, return the PC of the next
|
|
instruction to be executed. */
|
|
|
|
static CORE_ADDR
|
|
arm_linux_syscall_next_pc (struct frame_info *frame)
|
|
{
|
|
CORE_ADDR pc = get_frame_pc (frame);
|
|
CORE_ADDR return_addr = 0;
|
|
int is_thumb = arm_frame_is_thumb (frame);
|
|
ULONGEST svc_number = 0;
|
|
|
|
if (is_thumb)
|
|
{
|
|
svc_number = get_frame_register_unsigned (frame, 7);
|
|
return_addr = pc + 2;
|
|
}
|
|
else
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (frame);
|
|
enum bfd_endian byte_order_for_code =
|
|
gdbarch_byte_order_for_code (gdbarch);
|
|
unsigned long this_instr =
|
|
read_memory_unsigned_integer (pc, 4, byte_order_for_code);
|
|
|
|
unsigned long svc_operand = (0x00ffffff & this_instr);
|
|
if (svc_operand) /* OABI. */
|
|
{
|
|
svc_number = svc_operand - 0x900000;
|
|
}
|
|
else /* EABI. */
|
|
{
|
|
svc_number = get_frame_register_unsigned (frame, 7);
|
|
}
|
|
|
|
return_addr = pc + 4;
|
|
}
|
|
|
|
arm_linux_sigreturn_return_addr (frame, svc_number, &return_addr, &is_thumb);
|
|
|
|
/* Addresses for calling Thumb functions have the bit 0 set. */
|
|
if (is_thumb)
|
|
return_addr |= 1;
|
|
|
|
return return_addr;
|
|
}
|
|
|
|
|
|
/* Insert a single step breakpoint at the next executed instruction. */
|
|
|
|
static int
|
|
arm_linux_software_single_step (struct frame_info *frame)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (frame);
|
|
struct address_space *aspace = get_frame_address_space (frame);
|
|
CORE_ADDR next_pc;
|
|
|
|
if (arm_deal_with_atomic_sequence (frame))
|
|
return 1;
|
|
|
|
next_pc = arm_get_next_pc (frame, get_frame_pc (frame));
|
|
|
|
/* The Linux kernel offers some user-mode helpers in a high page. We can
|
|
not read this page (as of 2.6.23), and even if we could then we couldn't
|
|
set breakpoints in it, and even if we could then the atomic operations
|
|
would fail when interrupted. They are all called as functions and return
|
|
to the address in LR, so step to there instead. */
|
|
if (next_pc > 0xffff0000)
|
|
next_pc = get_frame_register_unsigned (frame, ARM_LR_REGNUM);
|
|
|
|
arm_insert_single_step_breakpoint (gdbarch, aspace, next_pc);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Support for displaced stepping of Linux SVC instructions. */
|
|
|
|
static void
|
|
arm_linux_cleanup_svc (struct gdbarch *gdbarch,
|
|
struct regcache *regs,
|
|
struct displaced_step_closure *dsc)
|
|
{
|
|
CORE_ADDR from = dsc->insn_addr;
|
|
ULONGEST apparent_pc;
|
|
int within_scratch;
|
|
|
|
regcache_cooked_read_unsigned (regs, ARM_PC_REGNUM, &apparent_pc);
|
|
|
|
within_scratch = (apparent_pc >= dsc->scratch_base
|
|
&& apparent_pc < (dsc->scratch_base
|
|
+ DISPLACED_MODIFIED_INSNS * 4 + 4));
|
|
|
|
if (debug_displaced)
|
|
{
|
|
fprintf_unfiltered (gdb_stdlog, "displaced: PC is apparently %.8lx after "
|
|
"SVC step ", (unsigned long) apparent_pc);
|
|
if (within_scratch)
|
|
fprintf_unfiltered (gdb_stdlog, "(within scratch space)\n");
|
|
else
|
|
fprintf_unfiltered (gdb_stdlog, "(outside scratch space)\n");
|
|
}
|
|
|
|
if (within_scratch)
|
|
displaced_write_reg (regs, dsc, ARM_PC_REGNUM, from + 4, BRANCH_WRITE_PC);
|
|
}
|
|
|
|
static int
|
|
arm_linux_copy_svc (struct gdbarch *gdbarch, struct regcache *regs,
|
|
struct displaced_step_closure *dsc)
|
|
{
|
|
CORE_ADDR return_to = 0;
|
|
|
|
struct frame_info *frame;
|
|
unsigned int svc_number = displaced_read_reg (regs, dsc, 7);
|
|
int is_sigreturn = 0;
|
|
int is_thumb;
|
|
|
|
frame = get_current_frame ();
|
|
|
|
is_sigreturn = arm_linux_sigreturn_return_addr(frame, svc_number,
|
|
&return_to, &is_thumb);
|
|
if (is_sigreturn)
|
|
{
|
|
struct symtab_and_line sal;
|
|
|
|
if (debug_displaced)
|
|
fprintf_unfiltered (gdb_stdlog, "displaced: found "
|
|
"sigreturn/rt_sigreturn SVC call. PC in frame = %lx\n",
|
|
(unsigned long) get_frame_pc (frame));
|
|
|
|
if (debug_displaced)
|
|
fprintf_unfiltered (gdb_stdlog, "displaced: unwind pc = %lx. "
|
|
"Setting momentary breakpoint.\n", (unsigned long) return_to);
|
|
|
|
gdb_assert (inferior_thread ()->control.step_resume_breakpoint
|
|
== NULL);
|
|
|
|
sal = find_pc_line (return_to, 0);
|
|
sal.pc = return_to;
|
|
sal.section = find_pc_overlay (return_to);
|
|
sal.explicit_pc = 1;
|
|
|
|
frame = get_prev_frame (frame);
|
|
|
|
if (frame)
|
|
{
|
|
inferior_thread ()->control.step_resume_breakpoint
|
|
= set_momentary_breakpoint (gdbarch, sal, get_frame_id (frame),
|
|
bp_step_resume);
|
|
|
|
/* set_momentary_breakpoint invalidates FRAME. */
|
|
frame = NULL;
|
|
|
|
/* We need to make sure we actually insert the momentary
|
|
breakpoint set above. */
|
|
insert_breakpoints ();
|
|
}
|
|
else if (debug_displaced)
|
|
fprintf_unfiltered (gdb_stderr, "displaced: couldn't find previous "
|
|
"frame to set momentary breakpoint for "
|
|
"sigreturn/rt_sigreturn\n");
|
|
}
|
|
else if (debug_displaced)
|
|
fprintf_unfiltered (gdb_stdlog, "displaced: sigreturn/rt_sigreturn "
|
|
"SVC call not in signal trampoline frame\n");
|
|
|
|
|
|
/* Preparation: If we detect sigreturn, set momentary breakpoint at resume
|
|
location, else nothing.
|
|
Insn: unmodified svc.
|
|
Cleanup: if pc lands in scratch space, pc <- insn_addr + 4
|
|
else leave pc alone. */
|
|
|
|
|
|
dsc->cleanup = &arm_linux_cleanup_svc;
|
|
/* Pretend we wrote to the PC, so cleanup doesn't set PC to the next
|
|
instruction. */
|
|
dsc->wrote_to_pc = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* The following two functions implement single-stepping over calls to Linux
|
|
kernel helper routines, which perform e.g. atomic operations on architecture
|
|
variants which don't support them natively.
|
|
|
|
When this function is called, the PC will be pointing at the kernel helper
|
|
(at an address inaccessible to GDB), and r14 will point to the return
|
|
address. Displaced stepping always executes code in the copy area:
|
|
so, make the copy-area instruction branch back to the kernel helper (the
|
|
"from" address), and make r14 point to the breakpoint in the copy area. In
|
|
that way, we regain control once the kernel helper returns, and can clean
|
|
up appropriately (as if we had just returned from the kernel helper as it
|
|
would have been called from the non-displaced location). */
|
|
|
|
static void
|
|
cleanup_kernel_helper_return (struct gdbarch *gdbarch,
|
|
struct regcache *regs,
|
|
struct displaced_step_closure *dsc)
|
|
{
|
|
displaced_write_reg (regs, dsc, ARM_LR_REGNUM, dsc->tmp[0], CANNOT_WRITE_PC);
|
|
displaced_write_reg (regs, dsc, ARM_PC_REGNUM, dsc->tmp[0], BRANCH_WRITE_PC);
|
|
}
|
|
|
|
static void
|
|
arm_catch_kernel_helper_return (struct gdbarch *gdbarch, CORE_ADDR from,
|
|
CORE_ADDR to, struct regcache *regs,
|
|
struct displaced_step_closure *dsc)
|
|
{
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
|
|
dsc->numinsns = 1;
|
|
dsc->insn_addr = from;
|
|
dsc->cleanup = &cleanup_kernel_helper_return;
|
|
/* Say we wrote to the PC, else cleanup will set PC to the next
|
|
instruction in the helper, which isn't helpful. */
|
|
dsc->wrote_to_pc = 1;
|
|
|
|
/* Preparation: tmp[0] <- r14
|
|
r14 <- <scratch space>+4
|
|
*(<scratch space>+8) <- from
|
|
Insn: ldr pc, [r14, #4]
|
|
Cleanup: r14 <- tmp[0], pc <- tmp[0]. */
|
|
|
|
dsc->tmp[0] = displaced_read_reg (regs, dsc, ARM_LR_REGNUM);
|
|
displaced_write_reg (regs, dsc, ARM_LR_REGNUM, (ULONGEST) to + 4,
|
|
CANNOT_WRITE_PC);
|
|
write_memory_unsigned_integer (to + 8, 4, byte_order, from);
|
|
|
|
dsc->modinsn[0] = 0xe59ef004; /* ldr pc, [lr, #4]. */
|
|
}
|
|
|
|
/* Linux-specific displaced step instruction copying function. Detects when
|
|
the program has stepped into a Linux kernel helper routine (which must be
|
|
handled as a special case), falling back to arm_displaced_step_copy_insn()
|
|
if it hasn't. */
|
|
|
|
static struct displaced_step_closure *
|
|
arm_linux_displaced_step_copy_insn (struct gdbarch *gdbarch,
|
|
CORE_ADDR from, CORE_ADDR to,
|
|
struct regcache *regs)
|
|
{
|
|
struct displaced_step_closure *dsc
|
|
= xmalloc (sizeof (struct displaced_step_closure));
|
|
|
|
/* Detect when we enter an (inaccessible by GDB) Linux kernel helper, and
|
|
stop at the return location. */
|
|
if (from > 0xffff0000)
|
|
{
|
|
if (debug_displaced)
|
|
fprintf_unfiltered (gdb_stdlog, "displaced: detected kernel helper "
|
|
"at %.8lx\n", (unsigned long) from);
|
|
|
|
arm_catch_kernel_helper_return (gdbarch, from, to, regs, dsc);
|
|
}
|
|
else
|
|
{
|
|
/* Override the default handling of SVC instructions. */
|
|
dsc->u.svc.copy_svc_os = arm_linux_copy_svc;
|
|
|
|
arm_process_displaced_insn (gdbarch, from, to, regs, dsc);
|
|
}
|
|
|
|
arm_displaced_init_closure (gdbarch, from, to, dsc);
|
|
|
|
return dsc;
|
|
}
|
|
|
|
/* Implementation of `gdbarch_stap_is_single_operand', as defined in
|
|
gdbarch.h. */
|
|
|
|
static int
|
|
arm_stap_is_single_operand (struct gdbarch *gdbarch, const char *s)
|
|
{
|
|
return (*s == '#' || *s == '$' || isdigit (*s) /* Literal number. */
|
|
|| *s == '[' /* Register indirection or
|
|
displacement. */
|
|
|| isalpha (*s)); /* Register value. */
|
|
}
|
|
|
|
/* This routine is used to parse a special token in ARM's assembly.
|
|
|
|
The special tokens parsed by it are:
|
|
|
|
- Register displacement (e.g, [fp, #-8])
|
|
|
|
It returns one if the special token has been parsed successfully,
|
|
or zero if the current token is not considered special. */
|
|
|
|
static int
|
|
arm_stap_parse_special_token (struct gdbarch *gdbarch,
|
|
struct stap_parse_info *p)
|
|
{
|
|
if (*p->arg == '[')
|
|
{
|
|
/* Temporary holder for lookahead. */
|
|
const char *tmp = p->arg;
|
|
char *endp;
|
|
/* Used to save the register name. */
|
|
const char *start;
|
|
char *regname;
|
|
int len, offset;
|
|
int got_minus = 0;
|
|
long displacement;
|
|
struct stoken str;
|
|
|
|
++tmp;
|
|
start = tmp;
|
|
|
|
/* Register name. */
|
|
while (isalnum (*tmp))
|
|
++tmp;
|
|
|
|
if (*tmp != ',')
|
|
return 0;
|
|
|
|
len = tmp - start;
|
|
regname = alloca (len + 2);
|
|
|
|
offset = 0;
|
|
if (isdigit (*start))
|
|
{
|
|
/* If we are dealing with a register whose name begins with a
|
|
digit, it means we should prefix the name with the letter
|
|
`r', because GDB expects this name pattern. Otherwise (e.g.,
|
|
we are dealing with the register `fp'), we don't need to
|
|
add such a prefix. */
|
|
regname[0] = 'r';
|
|
offset = 1;
|
|
}
|
|
|
|
strncpy (regname + offset, start, len);
|
|
len += offset;
|
|
regname[len] = '\0';
|
|
|
|
if (user_reg_map_name_to_regnum (gdbarch, regname, len) == -1)
|
|
error (_("Invalid register name `%s' on expression `%s'."),
|
|
regname, p->saved_arg);
|
|
|
|
++tmp;
|
|
tmp = skip_spaces_const (tmp);
|
|
if (*tmp == '#' || *tmp == '$')
|
|
++tmp;
|
|
|
|
if (*tmp == '-')
|
|
{
|
|
++tmp;
|
|
got_minus = 1;
|
|
}
|
|
|
|
displacement = strtol (tmp, &endp, 10);
|
|
tmp = endp;
|
|
|
|
/* Skipping last `]'. */
|
|
if (*tmp++ != ']')
|
|
return 0;
|
|
|
|
/* The displacement. */
|
|
write_exp_elt_opcode (&p->pstate, OP_LONG);
|
|
write_exp_elt_type (&p->pstate, builtin_type (gdbarch)->builtin_long);
|
|
write_exp_elt_longcst (&p->pstate, displacement);
|
|
write_exp_elt_opcode (&p->pstate, OP_LONG);
|
|
if (got_minus)
|
|
write_exp_elt_opcode (&p->pstate, UNOP_NEG);
|
|
|
|
/* The register name. */
|
|
write_exp_elt_opcode (&p->pstate, OP_REGISTER);
|
|
str.ptr = regname;
|
|
str.length = len;
|
|
write_exp_string (&p->pstate, str);
|
|
write_exp_elt_opcode (&p->pstate, OP_REGISTER);
|
|
|
|
write_exp_elt_opcode (&p->pstate, BINOP_ADD);
|
|
|
|
/* Casting to the expected type. */
|
|
write_exp_elt_opcode (&p->pstate, UNOP_CAST);
|
|
write_exp_elt_type (&p->pstate, lookup_pointer_type (p->arg_type));
|
|
write_exp_elt_opcode (&p->pstate, UNOP_CAST);
|
|
|
|
write_exp_elt_opcode (&p->pstate, UNOP_IND);
|
|
|
|
p->arg = tmp;
|
|
}
|
|
else
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* ARM process record-replay constructs: syscall, signal etc. */
|
|
|
|
struct linux_record_tdep arm_linux_record_tdep;
|
|
|
|
/* arm_canonicalize_syscall maps from the native arm Linux set
|
|
of syscall ids into a canonical set of syscall ids used by
|
|
process record. */
|
|
|
|
static enum gdb_syscall
|
|
arm_canonicalize_syscall (int syscall)
|
|
{
|
|
enum { sys_process_vm_writev = 377 };
|
|
|
|
if (syscall <= gdb_sys_sched_getaffinity)
|
|
return syscall;
|
|
else if (syscall >= 243 && syscall <= 247)
|
|
return syscall + 2;
|
|
else if (syscall >= 248 && syscall <= 253)
|
|
return syscall + 4;
|
|
|
|
return -1;
|
|
}
|
|
|
|
/* Record all registers but PC register for process-record. */
|
|
|
|
static int
|
|
arm_all_but_pc_registers_record (struct regcache *regcache)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARM_PC_REGNUM; i++)
|
|
{
|
|
if (record_full_arch_list_add_reg (regcache, ARM_A1_REGNUM + i))
|
|
return -1;
|
|
}
|
|
|
|
if (record_full_arch_list_add_reg (regcache, ARM_PS_REGNUM))
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Handler for arm system call instruction recording. */
|
|
|
|
static int
|
|
arm_linux_syscall_record (struct regcache *regcache, unsigned long svc_number)
|
|
{
|
|
int ret = 0;
|
|
enum gdb_syscall syscall_gdb;
|
|
|
|
syscall_gdb = arm_canonicalize_syscall (svc_number);
|
|
|
|
if (syscall_gdb < 0)
|
|
{
|
|
printf_unfiltered (_("Process record and replay target doesn't "
|
|
"support syscall number %s\n"),
|
|
plongest (svc_number));
|
|
return -1;
|
|
}
|
|
|
|
if (syscall_gdb == gdb_sys_sigreturn
|
|
|| syscall_gdb == gdb_sys_rt_sigreturn)
|
|
{
|
|
if (arm_all_but_pc_registers_record (regcache))
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
ret = record_linux_system_call (syscall_gdb, regcache,
|
|
&arm_linux_record_tdep);
|
|
if (ret != 0)
|
|
return ret;
|
|
|
|
/* Record the return value of the system call. */
|
|
if (record_full_arch_list_add_reg (regcache, ARM_A1_REGNUM))
|
|
return -1;
|
|
/* Record LR. */
|
|
if (record_full_arch_list_add_reg (regcache, ARM_LR_REGNUM))
|
|
return -1;
|
|
/* Record CPSR. */
|
|
if (record_full_arch_list_add_reg (regcache, ARM_PS_REGNUM))
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Implement the skip_trampoline_code gdbarch method. */
|
|
|
|
static CORE_ADDR
|
|
arm_linux_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
|
|
{
|
|
CORE_ADDR target_pc = arm_skip_stub (frame, pc);
|
|
|
|
if (target_pc != 0)
|
|
return target_pc;
|
|
|
|
return find_solib_trampoline_target (frame, pc);
|
|
}
|
|
|
|
static void
|
|
arm_linux_init_abi (struct gdbarch_info info,
|
|
struct gdbarch *gdbarch)
|
|
{
|
|
static const char *const stap_integer_prefixes[] = { "#", "$", "", NULL };
|
|
static const char *const stap_register_prefixes[] = { "r", NULL };
|
|
static const char *const stap_register_indirection_prefixes[] = { "[",
|
|
NULL };
|
|
static const char *const stap_register_indirection_suffixes[] = { "]",
|
|
NULL };
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
linux_init_abi (info, gdbarch);
|
|
|
|
tdep->lowest_pc = 0x8000;
|
|
if (info.byte_order_for_code == BFD_ENDIAN_BIG)
|
|
{
|
|
if (tdep->arm_abi == ARM_ABI_AAPCS)
|
|
tdep->arm_breakpoint = eabi_linux_arm_be_breakpoint;
|
|
else
|
|
tdep->arm_breakpoint = arm_linux_arm_be_breakpoint;
|
|
tdep->thumb_breakpoint = arm_linux_thumb_be_breakpoint;
|
|
tdep->thumb2_breakpoint = arm_linux_thumb2_be_breakpoint;
|
|
}
|
|
else
|
|
{
|
|
if (tdep->arm_abi == ARM_ABI_AAPCS)
|
|
tdep->arm_breakpoint = eabi_linux_arm_le_breakpoint;
|
|
else
|
|
tdep->arm_breakpoint = arm_linux_arm_le_breakpoint;
|
|
tdep->thumb_breakpoint = arm_linux_thumb_le_breakpoint;
|
|
tdep->thumb2_breakpoint = arm_linux_thumb2_le_breakpoint;
|
|
}
|
|
tdep->arm_breakpoint_size = sizeof (arm_linux_arm_le_breakpoint);
|
|
tdep->thumb_breakpoint_size = sizeof (arm_linux_thumb_le_breakpoint);
|
|
tdep->thumb2_breakpoint_size = sizeof (arm_linux_thumb2_le_breakpoint);
|
|
|
|
if (tdep->fp_model == ARM_FLOAT_AUTO)
|
|
tdep->fp_model = ARM_FLOAT_FPA;
|
|
|
|
switch (tdep->fp_model)
|
|
{
|
|
case ARM_FLOAT_FPA:
|
|
tdep->jb_pc = ARM_LINUX_JB_PC_FPA;
|
|
break;
|
|
case ARM_FLOAT_SOFT_FPA:
|
|
case ARM_FLOAT_SOFT_VFP:
|
|
case ARM_FLOAT_VFP:
|
|
tdep->jb_pc = ARM_LINUX_JB_PC_EABI;
|
|
break;
|
|
default:
|
|
internal_error
|
|
(__FILE__, __LINE__,
|
|
_("arm_linux_init_abi: Floating point model not supported"));
|
|
break;
|
|
}
|
|
tdep->jb_elt_size = ARM_LINUX_JB_ELEMENT_SIZE;
|
|
|
|
set_solib_svr4_fetch_link_map_offsets
|
|
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
|
|
|
|
/* Single stepping. */
|
|
set_gdbarch_software_single_step (gdbarch, arm_linux_software_single_step);
|
|
|
|
/* Shared library handling. */
|
|
set_gdbarch_skip_trampoline_code (gdbarch, arm_linux_skip_trampoline_code);
|
|
set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
|
|
|
|
/* Enable TLS support. */
|
|
set_gdbarch_fetch_tls_load_module_address (gdbarch,
|
|
svr4_fetch_objfile_link_map);
|
|
|
|
tramp_frame_prepend_unwinder (gdbarch,
|
|
&arm_linux_sigreturn_tramp_frame);
|
|
tramp_frame_prepend_unwinder (gdbarch,
|
|
&arm_linux_rt_sigreturn_tramp_frame);
|
|
tramp_frame_prepend_unwinder (gdbarch,
|
|
&arm_eabi_linux_sigreturn_tramp_frame);
|
|
tramp_frame_prepend_unwinder (gdbarch,
|
|
&arm_eabi_linux_rt_sigreturn_tramp_frame);
|
|
tramp_frame_prepend_unwinder (gdbarch,
|
|
&thumb2_eabi_linux_sigreturn_tramp_frame);
|
|
tramp_frame_prepend_unwinder (gdbarch,
|
|
&thumb2_eabi_linux_rt_sigreturn_tramp_frame);
|
|
tramp_frame_prepend_unwinder (gdbarch,
|
|
&arm_linux_restart_syscall_tramp_frame);
|
|
tramp_frame_prepend_unwinder (gdbarch,
|
|
&arm_kernel_linux_restart_syscall_tramp_frame);
|
|
|
|
/* Core file support. */
|
|
set_gdbarch_iterate_over_regset_sections
|
|
(gdbarch, arm_linux_iterate_over_regset_sections);
|
|
set_gdbarch_core_read_description (gdbarch, arm_linux_core_read_description);
|
|
|
|
set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type);
|
|
|
|
/* Displaced stepping. */
|
|
set_gdbarch_displaced_step_copy_insn (gdbarch,
|
|
arm_linux_displaced_step_copy_insn);
|
|
set_gdbarch_displaced_step_fixup (gdbarch, arm_displaced_step_fixup);
|
|
set_gdbarch_displaced_step_free_closure (gdbarch,
|
|
simple_displaced_step_free_closure);
|
|
set_gdbarch_displaced_step_location (gdbarch, displaced_step_at_entry_point);
|
|
|
|
/* Reversible debugging, process record. */
|
|
set_gdbarch_process_record (gdbarch, arm_process_record);
|
|
|
|
/* SystemTap functions. */
|
|
set_gdbarch_stap_integer_prefixes (gdbarch, stap_integer_prefixes);
|
|
set_gdbarch_stap_register_prefixes (gdbarch, stap_register_prefixes);
|
|
set_gdbarch_stap_register_indirection_prefixes (gdbarch,
|
|
stap_register_indirection_prefixes);
|
|
set_gdbarch_stap_register_indirection_suffixes (gdbarch,
|
|
stap_register_indirection_suffixes);
|
|
set_gdbarch_stap_gdb_register_prefix (gdbarch, "r");
|
|
set_gdbarch_stap_is_single_operand (gdbarch, arm_stap_is_single_operand);
|
|
set_gdbarch_stap_parse_special_token (gdbarch,
|
|
arm_stap_parse_special_token);
|
|
|
|
tdep->syscall_next_pc = arm_linux_syscall_next_pc;
|
|
|
|
/* `catch syscall' */
|
|
set_xml_syscall_file_name (gdbarch, "syscalls/arm-linux.xml");
|
|
set_gdbarch_get_syscall_number (gdbarch, arm_linux_get_syscall_number);
|
|
|
|
/* Syscall record. */
|
|
tdep->arm_syscall_record = arm_linux_syscall_record;
|
|
|
|
/* Initialize the arm_linux_record_tdep. */
|
|
/* These values are the size of the type that will be used in a system
|
|
call. They are obtained from Linux Kernel source. */
|
|
arm_linux_record_tdep.size_pointer
|
|
= gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT;
|
|
arm_linux_record_tdep.size__old_kernel_stat = 32;
|
|
arm_linux_record_tdep.size_tms = 16;
|
|
arm_linux_record_tdep.size_loff_t = 8;
|
|
arm_linux_record_tdep.size_flock = 16;
|
|
arm_linux_record_tdep.size_oldold_utsname = 45;
|
|
arm_linux_record_tdep.size_ustat = 20;
|
|
arm_linux_record_tdep.size_old_sigaction = 140;
|
|
arm_linux_record_tdep.size_old_sigset_t = 128;
|
|
arm_linux_record_tdep.size_rlimit = 8;
|
|
arm_linux_record_tdep.size_rusage = 72;
|
|
arm_linux_record_tdep.size_timeval = 8;
|
|
arm_linux_record_tdep.size_timezone = 8;
|
|
arm_linux_record_tdep.size_old_gid_t = 2;
|
|
arm_linux_record_tdep.size_old_uid_t = 2;
|
|
arm_linux_record_tdep.size_fd_set = 128;
|
|
arm_linux_record_tdep.size_dirent = 268;
|
|
arm_linux_record_tdep.size_dirent64 = 276;
|
|
arm_linux_record_tdep.size_statfs = 64;
|
|
arm_linux_record_tdep.size_statfs64 = 84;
|
|
arm_linux_record_tdep.size_sockaddr = 16;
|
|
arm_linux_record_tdep.size_int
|
|
= gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT;
|
|
arm_linux_record_tdep.size_long
|
|
= gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
|
|
arm_linux_record_tdep.size_ulong
|
|
= gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
|
|
arm_linux_record_tdep.size_msghdr = 28;
|
|
arm_linux_record_tdep.size_itimerval = 16;
|
|
arm_linux_record_tdep.size_stat = 88;
|
|
arm_linux_record_tdep.size_old_utsname = 325;
|
|
arm_linux_record_tdep.size_sysinfo = 64;
|
|
arm_linux_record_tdep.size_msqid_ds = 88;
|
|
arm_linux_record_tdep.size_shmid_ds = 84;
|
|
arm_linux_record_tdep.size_new_utsname = 390;
|
|
arm_linux_record_tdep.size_timex = 128;
|
|
arm_linux_record_tdep.size_mem_dqinfo = 24;
|
|
arm_linux_record_tdep.size_if_dqblk = 68;
|
|
arm_linux_record_tdep.size_fs_quota_stat = 68;
|
|
arm_linux_record_tdep.size_timespec = 8;
|
|
arm_linux_record_tdep.size_pollfd = 8;
|
|
arm_linux_record_tdep.size_NFS_FHSIZE = 32;
|
|
arm_linux_record_tdep.size_knfsd_fh = 132;
|
|
arm_linux_record_tdep.size_TASK_COMM_LEN = 16;
|
|
arm_linux_record_tdep.size_sigaction = 140;
|
|
arm_linux_record_tdep.size_sigset_t = 8;
|
|
arm_linux_record_tdep.size_siginfo_t = 128;
|
|
arm_linux_record_tdep.size_cap_user_data_t = 12;
|
|
arm_linux_record_tdep.size_stack_t = 12;
|
|
arm_linux_record_tdep.size_off_t = arm_linux_record_tdep.size_long;
|
|
arm_linux_record_tdep.size_stat64 = 96;
|
|
arm_linux_record_tdep.size_gid_t = 2;
|
|
arm_linux_record_tdep.size_uid_t = 2;
|
|
arm_linux_record_tdep.size_PAGE_SIZE = 4096;
|
|
arm_linux_record_tdep.size_flock64 = 24;
|
|
arm_linux_record_tdep.size_user_desc = 16;
|
|
arm_linux_record_tdep.size_io_event = 32;
|
|
arm_linux_record_tdep.size_iocb = 64;
|
|
arm_linux_record_tdep.size_epoll_event = 12;
|
|
arm_linux_record_tdep.size_itimerspec
|
|
= arm_linux_record_tdep.size_timespec * 2;
|
|
arm_linux_record_tdep.size_mq_attr = 32;
|
|
arm_linux_record_tdep.size_siginfo = 128;
|
|
arm_linux_record_tdep.size_termios = 36;
|
|
arm_linux_record_tdep.size_termios2 = 44;
|
|
arm_linux_record_tdep.size_pid_t = 4;
|
|
arm_linux_record_tdep.size_winsize = 8;
|
|
arm_linux_record_tdep.size_serial_struct = 60;
|
|
arm_linux_record_tdep.size_serial_icounter_struct = 80;
|
|
arm_linux_record_tdep.size_hayes_esp_config = 12;
|
|
arm_linux_record_tdep.size_size_t = 4;
|
|
arm_linux_record_tdep.size_iovec = 8;
|
|
|
|
/* These values are the second argument of system call "sys_ioctl".
|
|
They are obtained from Linux Kernel source. */
|
|
arm_linux_record_tdep.ioctl_TCGETS = 0x5401;
|
|
arm_linux_record_tdep.ioctl_TCSETS = 0x5402;
|
|
arm_linux_record_tdep.ioctl_TCSETSW = 0x5403;
|
|
arm_linux_record_tdep.ioctl_TCSETSF = 0x5404;
|
|
arm_linux_record_tdep.ioctl_TCGETA = 0x5405;
|
|
arm_linux_record_tdep.ioctl_TCSETA = 0x5406;
|
|
arm_linux_record_tdep.ioctl_TCSETAW = 0x5407;
|
|
arm_linux_record_tdep.ioctl_TCSETAF = 0x5408;
|
|
arm_linux_record_tdep.ioctl_TCSBRK = 0x5409;
|
|
arm_linux_record_tdep.ioctl_TCXONC = 0x540a;
|
|
arm_linux_record_tdep.ioctl_TCFLSH = 0x540b;
|
|
arm_linux_record_tdep.ioctl_TIOCEXCL = 0x540c;
|
|
arm_linux_record_tdep.ioctl_TIOCNXCL = 0x540d;
|
|
arm_linux_record_tdep.ioctl_TIOCSCTTY = 0x540e;
|
|
arm_linux_record_tdep.ioctl_TIOCGPGRP = 0x540f;
|
|
arm_linux_record_tdep.ioctl_TIOCSPGRP = 0x5410;
|
|
arm_linux_record_tdep.ioctl_TIOCOUTQ = 0x5411;
|
|
arm_linux_record_tdep.ioctl_TIOCSTI = 0x5412;
|
|
arm_linux_record_tdep.ioctl_TIOCGWINSZ = 0x5413;
|
|
arm_linux_record_tdep.ioctl_TIOCSWINSZ = 0x5414;
|
|
arm_linux_record_tdep.ioctl_TIOCMGET = 0x5415;
|
|
arm_linux_record_tdep.ioctl_TIOCMBIS = 0x5416;
|
|
arm_linux_record_tdep.ioctl_TIOCMBIC = 0x5417;
|
|
arm_linux_record_tdep.ioctl_TIOCMSET = 0x5418;
|
|
arm_linux_record_tdep.ioctl_TIOCGSOFTCAR = 0x5419;
|
|
arm_linux_record_tdep.ioctl_TIOCSSOFTCAR = 0x541a;
|
|
arm_linux_record_tdep.ioctl_FIONREAD = 0x541b;
|
|
arm_linux_record_tdep.ioctl_TIOCINQ = arm_linux_record_tdep.ioctl_FIONREAD;
|
|
arm_linux_record_tdep.ioctl_TIOCLINUX = 0x541c;
|
|
arm_linux_record_tdep.ioctl_TIOCCONS = 0x541d;
|
|
arm_linux_record_tdep.ioctl_TIOCGSERIAL = 0x541e;
|
|
arm_linux_record_tdep.ioctl_TIOCSSERIAL = 0x541f;
|
|
arm_linux_record_tdep.ioctl_TIOCPKT = 0x5420;
|
|
arm_linux_record_tdep.ioctl_FIONBIO = 0x5421;
|
|
arm_linux_record_tdep.ioctl_TIOCNOTTY = 0x5422;
|
|
arm_linux_record_tdep.ioctl_TIOCSETD = 0x5423;
|
|
arm_linux_record_tdep.ioctl_TIOCGETD = 0x5424;
|
|
arm_linux_record_tdep.ioctl_TCSBRKP = 0x5425;
|
|
arm_linux_record_tdep.ioctl_TIOCTTYGSTRUCT = 0x5426;
|
|
arm_linux_record_tdep.ioctl_TIOCSBRK = 0x5427;
|
|
arm_linux_record_tdep.ioctl_TIOCCBRK = 0x5428;
|
|
arm_linux_record_tdep.ioctl_TIOCGSID = 0x5429;
|
|
arm_linux_record_tdep.ioctl_TCGETS2 = 0x802c542a;
|
|
arm_linux_record_tdep.ioctl_TCSETS2 = 0x402c542b;
|
|
arm_linux_record_tdep.ioctl_TCSETSW2 = 0x402c542c;
|
|
arm_linux_record_tdep.ioctl_TCSETSF2 = 0x402c542d;
|
|
arm_linux_record_tdep.ioctl_TIOCGPTN = 0x80045430;
|
|
arm_linux_record_tdep.ioctl_TIOCSPTLCK = 0x40045431;
|
|
arm_linux_record_tdep.ioctl_FIONCLEX = 0x5450;
|
|
arm_linux_record_tdep.ioctl_FIOCLEX = 0x5451;
|
|
arm_linux_record_tdep.ioctl_FIOASYNC = 0x5452;
|
|
arm_linux_record_tdep.ioctl_TIOCSERCONFIG = 0x5453;
|
|
arm_linux_record_tdep.ioctl_TIOCSERGWILD = 0x5454;
|
|
arm_linux_record_tdep.ioctl_TIOCSERSWILD = 0x5455;
|
|
arm_linux_record_tdep.ioctl_TIOCGLCKTRMIOS = 0x5456;
|
|
arm_linux_record_tdep.ioctl_TIOCSLCKTRMIOS = 0x5457;
|
|
arm_linux_record_tdep.ioctl_TIOCSERGSTRUCT = 0x5458;
|
|
arm_linux_record_tdep.ioctl_TIOCSERGETLSR = 0x5459;
|
|
arm_linux_record_tdep.ioctl_TIOCSERGETMULTI = 0x545a;
|
|
arm_linux_record_tdep.ioctl_TIOCSERSETMULTI = 0x545b;
|
|
arm_linux_record_tdep.ioctl_TIOCMIWAIT = 0x545c;
|
|
arm_linux_record_tdep.ioctl_TIOCGICOUNT = 0x545d;
|
|
arm_linux_record_tdep.ioctl_TIOCGHAYESESP = 0x545e;
|
|
arm_linux_record_tdep.ioctl_TIOCSHAYESESP = 0x545f;
|
|
arm_linux_record_tdep.ioctl_FIOQSIZE = 0x5460;
|
|
|
|
/* These values are the second argument of system call "sys_fcntl"
|
|
and "sys_fcntl64". They are obtained from Linux Kernel source. */
|
|
arm_linux_record_tdep.fcntl_F_GETLK = 5;
|
|
arm_linux_record_tdep.fcntl_F_GETLK64 = 12;
|
|
arm_linux_record_tdep.fcntl_F_SETLK64 = 13;
|
|
arm_linux_record_tdep.fcntl_F_SETLKW64 = 14;
|
|
|
|
arm_linux_record_tdep.arg1 = ARM_A1_REGNUM + 1;
|
|
arm_linux_record_tdep.arg2 = ARM_A1_REGNUM + 2;
|
|
arm_linux_record_tdep.arg3 = ARM_A1_REGNUM + 3;
|
|
arm_linux_record_tdep.arg4 = ARM_A1_REGNUM + 3;
|
|
}
|
|
|
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
|
extern initialize_file_ftype _initialize_arm_linux_tdep;
|
|
|
|
void
|
|
_initialize_arm_linux_tdep (void)
|
|
{
|
|
gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_LINUX,
|
|
arm_linux_init_abi);
|
|
}
|