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494 lines
14 KiB
C
494 lines
14 KiB
C
/* Target-dependent code for GNU/Linux running on the Fujitsu FR-V,
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for GDB.
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Copyright (C) 2004-2021 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 "gdbcore.h"
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#include "target.h"
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#include "frame.h"
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#include "osabi.h"
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#include "regcache.h"
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#include "elf-bfd.h"
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#include "elf/frv.h"
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#include "frv-tdep.h"
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#include "trad-frame.h"
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#include "frame-unwind.h"
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#include "regset.h"
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#include "linux-tdep.h"
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#include "gdbarch.h"
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/* Define the size (in bytes) of an FR-V instruction. */
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static const int frv_instr_size = 4;
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enum {
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NORMAL_SIGTRAMP = 1,
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RT_SIGTRAMP = 2
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};
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static int
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frv_linux_pc_in_sigtramp (struct gdbarch *gdbarch, CORE_ADDR pc,
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const char *name)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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gdb_byte buf[frv_instr_size];
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LONGEST instr;
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int retval = 0;
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if (target_read_memory (pc, buf, sizeof buf) != 0)
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return 0;
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instr = extract_unsigned_integer (buf, sizeof buf, byte_order);
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if (instr == 0x8efc0077) /* setlos #__NR_sigreturn, gr7 */
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retval = NORMAL_SIGTRAMP;
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else if (instr == 0x8efc00ad) /* setlos #__NR_rt_sigreturn, gr7 */
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retval = RT_SIGTRAMP;
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else
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return 0;
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if (target_read_memory (pc + frv_instr_size, buf, sizeof buf) != 0)
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return 0;
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instr = extract_unsigned_integer (buf, sizeof buf, byte_order);
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if (instr != 0xc0700000) /* tira gr0, 0 */
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return 0;
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/* If we get this far, we'll return a non-zero value, either
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NORMAL_SIGTRAMP (1) or RT_SIGTRAMP (2). */
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return retval;
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}
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/* Given NEXT_FRAME, the "callee" frame of the sigtramp frame that we
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wish to decode, and REGNO, one of the frv register numbers defined
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in frv-tdep.h, return the address of the saved register (corresponding
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to REGNO) in the sigtramp frame. Return -1 if the register is not
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found in the sigtramp frame. The magic numbers in the code below
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were computed by examining the following kernel structs:
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From arch/frv/kernel/signal.c:
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struct sigframe
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{
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void (*pretcode)(void);
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int sig;
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struct sigcontext sc;
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unsigned long extramask[_NSIG_WORDS-1];
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uint32_t retcode[2];
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};
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struct rt_sigframe
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{
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void (*pretcode)(void);
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int sig;
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struct siginfo *pinfo;
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void *puc;
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struct siginfo info;
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struct ucontext uc;
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uint32_t retcode[2];
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};
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From include/asm-frv/ucontext.h:
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struct ucontext {
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unsigned long uc_flags;
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struct ucontext *uc_link;
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stack_t uc_stack;
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struct sigcontext uc_mcontext;
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sigset_t uc_sigmask;
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};
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From include/asm-frv/signal.h:
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typedef struct sigaltstack {
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void *ss_sp;
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int ss_flags;
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size_t ss_size;
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} stack_t;
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From include/asm-frv/sigcontext.h:
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struct sigcontext {
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struct user_context sc_context;
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unsigned long sc_oldmask;
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} __attribute__((aligned(8)));
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From include/asm-frv/registers.h:
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struct user_int_regs
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{
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unsigned long psr;
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unsigned long isr;
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unsigned long ccr;
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unsigned long cccr;
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unsigned long lr;
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unsigned long lcr;
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unsigned long pc;
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unsigned long __status;
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unsigned long syscallno;
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unsigned long orig_gr8;
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unsigned long gner[2];
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unsigned long long iacc[1];
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union {
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unsigned long tbr;
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unsigned long gr[64];
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};
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};
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struct user_fpmedia_regs
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{
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unsigned long fr[64];
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unsigned long fner[2];
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unsigned long msr[2];
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unsigned long acc[8];
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unsigned char accg[8];
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unsigned long fsr[1];
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};
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struct user_context
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{
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struct user_int_regs i;
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struct user_fpmedia_regs f;
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void *extension;
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} __attribute__((aligned(8))); */
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static LONGEST
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frv_linux_sigcontext_reg_addr (struct frame_info *this_frame, int regno,
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CORE_ADDR *sc_addr_cache_ptr)
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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 sc_addr;
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if (sc_addr_cache_ptr && *sc_addr_cache_ptr)
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{
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sc_addr = *sc_addr_cache_ptr;
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}
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else
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{
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CORE_ADDR pc, sp;
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gdb_byte buf[4];
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int tramp_type;
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pc = get_frame_pc (this_frame);
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tramp_type = frv_linux_pc_in_sigtramp (gdbarch, pc, 0);
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get_frame_register (this_frame, sp_regnum, buf);
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sp = extract_unsigned_integer (buf, sizeof buf, byte_order);
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if (tramp_type == NORMAL_SIGTRAMP)
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{
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/* For a normal sigtramp frame, the sigcontext struct starts
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at SP + 8. */
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sc_addr = sp + 8;
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}
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else if (tramp_type == RT_SIGTRAMP)
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{
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/* For a realtime sigtramp frame, SP + 12 contains a pointer
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to a ucontext struct. The ucontext struct contains a
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sigcontext struct starting 24 bytes in. (The offset of
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uc_mcontext within struct ucontext is derived as follows:
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stack_t is a 12-byte struct and struct sigcontext is
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8-byte aligned. This gives an offset of 8 + 12 + 4 (for
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padding) = 24.) */
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if (target_read_memory (sp + 12, buf, sizeof buf) != 0)
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{
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warning (_("Can't read realtime sigtramp frame."));
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return 0;
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}
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sc_addr = extract_unsigned_integer (buf, sizeof buf, byte_order);
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sc_addr += 24;
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}
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else
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internal_error (__FILE__, __LINE__, _("not a signal trampoline"));
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if (sc_addr_cache_ptr)
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*sc_addr_cache_ptr = sc_addr;
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}
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switch (regno)
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{
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case psr_regnum :
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return sc_addr + 0;
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/* sc_addr + 4 has "isr", the Integer Status Register. */
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case ccr_regnum :
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return sc_addr + 8;
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case cccr_regnum :
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return sc_addr + 12;
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case lr_regnum :
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return sc_addr + 16;
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case lcr_regnum :
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return sc_addr + 20;
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case pc_regnum :
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return sc_addr + 24;
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/* sc_addr + 28 is __status, the exception status.
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sc_addr + 32 is syscallno, the syscall number or -1.
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sc_addr + 36 is orig_gr8, the original syscall arg #1.
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sc_addr + 40 is gner[0].
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sc_addr + 44 is gner[1]. */
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case iacc0h_regnum :
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return sc_addr + 48;
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case iacc0l_regnum :
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return sc_addr + 52;
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default :
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if (first_gpr_regnum <= regno && regno <= last_gpr_regnum)
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return sc_addr + 56 + 4 * (regno - first_gpr_regnum);
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else if (first_fpr_regnum <= regno && regno <= last_fpr_regnum)
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return sc_addr + 312 + 4 * (regno - first_fpr_regnum);
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else
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return -1; /* not saved. */
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}
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}
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/* Signal trampolines. */
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static struct trad_frame_cache *
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frv_linux_sigtramp_frame_cache (struct frame_info *this_frame,
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void **this_cache)
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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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struct trad_frame_cache *cache;
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CORE_ADDR addr;
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gdb_byte buf[4];
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int regnum;
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CORE_ADDR sc_addr_cache_val = 0;
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struct frame_id this_id;
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if (*this_cache)
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return (struct trad_frame_cache *) *this_cache;
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cache = trad_frame_cache_zalloc (this_frame);
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/* FIXME: cagney/2004-05-01: This is is long standing broken code.
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The frame ID's code address should be the start-address of the
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signal trampoline and not the current PC within that
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trampoline. */
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get_frame_register (this_frame, sp_regnum, buf);
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addr = extract_unsigned_integer (buf, sizeof buf, byte_order);
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this_id = frame_id_build (addr, get_frame_pc (this_frame));
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trad_frame_set_id (cache, this_id);
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for (regnum = 0; regnum < frv_num_regs; regnum++)
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{
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LONGEST reg_addr = frv_linux_sigcontext_reg_addr (this_frame, regnum,
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&sc_addr_cache_val);
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if (reg_addr != -1)
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trad_frame_set_reg_addr (cache, regnum, reg_addr);
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}
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*this_cache = cache;
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return cache;
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}
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static void
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frv_linux_sigtramp_frame_this_id (struct frame_info *this_frame,
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void **this_cache,
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struct frame_id *this_id)
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{
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struct trad_frame_cache *cache
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= frv_linux_sigtramp_frame_cache (this_frame, this_cache);
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trad_frame_get_id (cache, this_id);
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}
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static struct value *
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frv_linux_sigtramp_frame_prev_register (struct frame_info *this_frame,
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void **this_cache, int regnum)
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{
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/* Make sure we've initialized the cache. */
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struct trad_frame_cache *cache
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= frv_linux_sigtramp_frame_cache (this_frame, this_cache);
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return trad_frame_get_register (cache, this_frame, regnum);
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}
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static int
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frv_linux_sigtramp_frame_sniffer (const struct frame_unwind *self,
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struct frame_info *this_frame,
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void **this_cache)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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CORE_ADDR pc = get_frame_pc (this_frame);
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const char *name;
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find_pc_partial_function (pc, &name, NULL, NULL);
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if (frv_linux_pc_in_sigtramp (gdbarch, pc, name))
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return 1;
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return 0;
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}
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static const struct frame_unwind frv_linux_sigtramp_frame_unwind =
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{
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SIGTRAMP_FRAME,
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default_frame_unwind_stop_reason,
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frv_linux_sigtramp_frame_this_id,
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frv_linux_sigtramp_frame_prev_register,
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NULL,
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frv_linux_sigtramp_frame_sniffer
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};
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/* The FRV kernel defines ELF_NGREG as 46. We add 2 in order to include
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the loadmap addresses in the register set. (See below for more info.) */
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#define FRV_ELF_NGREG (46 + 2)
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typedef unsigned char frv_elf_greg_t[4];
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typedef struct { frv_elf_greg_t reg[FRV_ELF_NGREG]; } frv_elf_gregset_t;
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typedef unsigned char frv_elf_fpreg_t[4];
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typedef struct
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{
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frv_elf_fpreg_t fr[64];
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frv_elf_fpreg_t fner[2];
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frv_elf_fpreg_t msr[2];
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frv_elf_fpreg_t acc[8];
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unsigned char accg[8];
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frv_elf_fpreg_t fsr[1];
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} frv_elf_fpregset_t;
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/* Register maps. */
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static const struct regcache_map_entry frv_linux_gregmap[] =
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{
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{ 1, psr_regnum, 4 },
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{ 1, REGCACHE_MAP_SKIP, 4 }, /* isr */
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{ 1, ccr_regnum, 4 },
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{ 1, cccr_regnum, 4 },
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{ 1, lr_regnum, 4 },
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{ 1, lcr_regnum, 4 },
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{ 1, pc_regnum, 4 },
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{ 1, REGCACHE_MAP_SKIP, 4 }, /* __status */
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{ 1, REGCACHE_MAP_SKIP, 4 }, /* syscallno */
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{ 1, REGCACHE_MAP_SKIP, 4 }, /* orig_gr8 */
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{ 1, gner0_regnum, 4 },
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{ 1, gner1_regnum, 4 },
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{ 1, REGCACHE_MAP_SKIP, 8 }, /* iacc0 */
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{ 1, tbr_regnum, 4 },
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{ 31, first_gpr_regnum + 1, 4 }, /* gr1 ... gr31 */
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/* Technically, the loadmap addresses are not part of `pr_reg' as
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found in the elf_prstatus struct. The fields which communicate
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the loadmap address appear (by design) immediately after
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`pr_reg' though, and the BFD function elf32_frv_grok_prstatus()
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has been implemented to include these fields in the register
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section that it extracts from the core file. So, for our
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purposes, they may be viewed as registers. */
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{ 1, fdpic_loadmap_exec_regnum, 4 },
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{ 1, fdpic_loadmap_interp_regnum, 4 },
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{ 0 }
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};
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static const struct regcache_map_entry frv_linux_fpregmap[] =
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{
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{ 64, first_fpr_regnum, 4 }, /* fr0 ... fr63 */
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{ 1, fner0_regnum, 4 },
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{ 1, fner1_regnum, 4 },
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{ 1, msr0_regnum, 4 },
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{ 1, msr1_regnum, 4 },
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{ 8, acc0_regnum, 4 }, /* acc0 ... acc7 */
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{ 1, accg0123_regnum, 4 },
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{ 1, accg4567_regnum, 4 },
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{ 1, fsr0_regnum, 4 },
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{ 0 }
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};
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/* Unpack an frv_elf_gregset_t into GDB's register cache. */
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static void
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frv_linux_supply_gregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *gregs, size_t len)
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{
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int regi;
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/* gr0 always contains 0. Also, the kernel passes the TBR value in
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this slot. */
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regcache->raw_supply_zeroed (first_gpr_regnum);
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/* Fill gr32, ..., gr63 with zeros. */
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for (regi = first_gpr_regnum + 32; regi <= last_gpr_regnum; regi++)
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regcache->raw_supply_zeroed (regi);
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regcache_supply_regset (regset, regcache, regnum, gregs, len);
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}
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/* FRV Linux kernel register sets. */
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static const struct regset frv_linux_gregset =
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{
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frv_linux_gregmap,
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frv_linux_supply_gregset, regcache_collect_regset
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};
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static const struct regset frv_linux_fpregset =
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{
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frv_linux_fpregmap,
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regcache_supply_regset, regcache_collect_regset
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};
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static void
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frv_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
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iterate_over_regset_sections_cb *cb,
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void *cb_data,
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const struct regcache *regcache)
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{
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cb (".reg", sizeof (frv_elf_gregset_t), sizeof (frv_elf_gregset_t),
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&frv_linux_gregset, NULL, cb_data);
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cb (".reg2", sizeof (frv_elf_fpregset_t), sizeof (frv_elf_fpregset_t),
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&frv_linux_fpregset, NULL, cb_data);
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}
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static void
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frv_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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linux_init_abi (info, gdbarch, 0);
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/* Set the sigtramp frame sniffer. */
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frame_unwind_append_unwinder (gdbarch, &frv_linux_sigtramp_frame_unwind);
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set_gdbarch_iterate_over_regset_sections
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(gdbarch, frv_linux_iterate_over_regset_sections);
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}
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static enum gdb_osabi
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frv_linux_elf_osabi_sniffer (bfd *abfd)
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{
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int elf_flags;
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elf_flags = elf_elfheader (abfd)->e_flags;
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/* Assume GNU/Linux if using the FDPIC ABI. If/when another OS shows
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up that uses this ABI, we'll need to start using .note sections
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or some such. */
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if (elf_flags & EF_FRV_FDPIC)
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return GDB_OSABI_LINUX;
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else
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return GDB_OSABI_UNKNOWN;
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}
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void _initialize_frv_linux_tdep ();
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void
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_initialize_frv_linux_tdep ()
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{
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gdbarch_register_osabi (bfd_arch_frv, 0, GDB_OSABI_LINUX,
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frv_linux_init_abi);
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gdbarch_register_osabi_sniffer (bfd_arch_frv,
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bfd_target_elf_flavour,
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frv_linux_elf_osabi_sniffer);
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}
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