mirror of
https://sourceware.org/git/binutils-gdb.git
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61012eef84
This commit introduces a new inline common function "startswith" which takes two string arguments and returns nonzero if the first string starts with the second. It also updates the 295 places where this logic was written out longhand to use the new function. gdb/ChangeLog: * common/common-utils.h (startswith): New inline function. All places where this logic was used updated to use the above.
271 lines
7.6 KiB
C
271 lines
7.6 KiB
C
/* Target-dependent code for SDE on MIPS processors.
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Copyright (C) 2014-2015 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 "osabi.h"
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#include "elf-bfd.h"
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#include "block.h"
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#include "symtab.h"
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#include "frame.h"
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#include "frame-unwind.h"
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#include "frame-base.h"
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#include "trad-frame.h"
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#include "mips-tdep.h"
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/* Fill in the register cache *THIS_CACHE for THIS_FRAME for use
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in the SDE frame unwinder. */
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static struct trad_frame_cache *
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mips_sde_frame_cache (struct frame_info *this_frame, void **this_cache)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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const struct mips_regnum *regs = mips_regnum (gdbarch);
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const int sizeof_reg_t = mips_abi_regsize (gdbarch);
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enum mips_abi abi = mips_abi (gdbarch);
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struct trad_frame_cache *cache;
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CORE_ADDR xcpt_frame;
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CORE_ADDR start_addr;
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CORE_ADDR stack_addr;
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CORE_ADDR pc;
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int i;
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if (*this_cache != NULL)
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return *this_cache;
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cache = trad_frame_cache_zalloc (this_frame);
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*this_cache = cache;
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/* The previous registers are held in struct xcptcontext
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which is at $sp+offs
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struct xcptcontext {
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reg_t sr; CP0 Status
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reg_t cr; CP0 Cause
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reg_t epc; CP0 EPC
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reg_t vaddr; CP0 BadVAddr
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reg_t regs[32]; General registers
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reg_t mdlo; LO
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reg_t mdhi; HI
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reg_t mdex; ACX
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...
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};
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*/
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stack_addr = get_frame_register_signed (this_frame,
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gdbarch_sp_regnum (gdbarch));
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switch (abi)
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{
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case MIPS_ABI_O32:
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/* 40: XCPTCONTEXT
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24: xcpt_gen() argspace (16 bytes)
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16: _xcptcall() saved ra, rounded up ( 8 bytes)
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00: _xcptcall() argspace (16 bytes) */
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xcpt_frame = stack_addr + 40;
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break;
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case MIPS_ABI_N32:
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case MIPS_ABI_N64:
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default: /* Wild guess. */
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/* 16: XCPTCONTEXT
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16: xcpt_gen() argspace ( 0 bytes)
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00: _xcptcall() saved ra, rounded up (16 bytes) */
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xcpt_frame = stack_addr + 16;
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break;
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}
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trad_frame_set_reg_addr (cache,
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MIPS_PS_REGNUM + gdbarch_num_regs (gdbarch),
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xcpt_frame + 0 * sizeof_reg_t);
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trad_frame_set_reg_addr (cache,
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regs->cause + gdbarch_num_regs (gdbarch),
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xcpt_frame + 1 * sizeof_reg_t);
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trad_frame_set_reg_addr (cache,
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regs->pc + gdbarch_num_regs (gdbarch),
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xcpt_frame + 2 * sizeof_reg_t);
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trad_frame_set_reg_addr (cache,
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regs->badvaddr + gdbarch_num_regs (gdbarch),
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xcpt_frame + 3 * sizeof_reg_t);
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for (i = 0; i < MIPS_NUMREGS; i++)
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trad_frame_set_reg_addr (cache,
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i + MIPS_ZERO_REGNUM + gdbarch_num_regs (gdbarch),
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xcpt_frame + (4 + i) * sizeof_reg_t);
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trad_frame_set_reg_addr (cache,
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regs->lo + gdbarch_num_regs (gdbarch),
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xcpt_frame + 36 * sizeof_reg_t);
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trad_frame_set_reg_addr (cache,
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regs->hi + gdbarch_num_regs (gdbarch),
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xcpt_frame + 37 * sizeof_reg_t);
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pc = get_frame_pc (this_frame);
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find_pc_partial_function (pc, NULL, &start_addr, NULL);
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trad_frame_set_id (cache, frame_id_build (start_addr, stack_addr));
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return cache;
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}
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/* Implement the this_id function for the SDE frame unwinder. */
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static void
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mips_sde_frame_this_id (struct frame_info *this_frame, void **this_cache,
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struct frame_id *this_id)
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{
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struct trad_frame_cache *this_trad_cache
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= mips_sde_frame_cache (this_frame, this_cache);
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trad_frame_get_id (this_trad_cache, this_id);
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}
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/* Implement the prev_register function for the SDE frame unwinder. */
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static struct value *
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mips_sde_frame_prev_register (struct frame_info *this_frame,
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void **this_cache,
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int prev_regnum)
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{
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struct trad_frame_cache *trad_cache
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= mips_sde_frame_cache (this_frame, this_cache);
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return trad_frame_get_register (trad_cache, this_frame, prev_regnum);
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}
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/* Implement the sniffer function for the SDE frame unwinder. */
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static int
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mips_sde_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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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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return (name
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&& (strcmp (name, "_xcptcall") == 0
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|| strcmp (name, "_sigtramp") == 0));
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}
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/* Data structure for the SDE frame unwinder. */
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static const struct frame_unwind mips_sde_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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mips_sde_frame_this_id,
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mips_sde_frame_prev_register,
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NULL,
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mips_sde_frame_sniffer
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};
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/* Implement the this_base, this_locals, and this_args hooks
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for the normal unwinder. */
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static CORE_ADDR
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mips_sde_frame_base_address (struct frame_info *this_frame, void **this_cache)
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{
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struct trad_frame_cache *this_trad_cache
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= mips_sde_frame_cache (this_frame, this_cache);
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return trad_frame_get_this_base (this_trad_cache);
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}
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static const struct frame_base mips_sde_frame_base =
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{
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&mips_sde_frame_unwind,
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mips_sde_frame_base_address,
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mips_sde_frame_base_address,
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mips_sde_frame_base_address
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};
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static const struct frame_base *
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mips_sde_frame_base_sniffer (struct frame_info *this_frame)
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{
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if (mips_sde_frame_sniffer (&mips_sde_frame_unwind, this_frame, NULL))
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return &mips_sde_frame_base;
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else
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return NULL;
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}
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static void
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mips_sde_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect,
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void *obj)
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{
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enum gdb_osabi *os_ident_ptr = obj;
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const char *name;
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name = bfd_get_section_name (abfd, sect);
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/* The presence of a section with a ".sde" prefix is indicative
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of an SDE binary. */
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if (startswith (name, ".sde"))
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*os_ident_ptr = GDB_OSABI_SDE;
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}
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/* OSABI sniffer for MIPS SDE. */
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static enum gdb_osabi
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mips_sde_elf_osabi_sniffer (bfd *abfd)
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{
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enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
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unsigned int elfosabi;
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/* If the generic sniffer gets a hit, return and let other sniffers
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get a crack at it. */
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bfd_map_over_sections (abfd,
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generic_elf_osabi_sniff_abi_tag_sections,
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&osabi);
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if (osabi != GDB_OSABI_UNKNOWN)
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return GDB_OSABI_UNKNOWN;
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elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI];
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if (elfosabi == ELFOSABI_NONE)
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{
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/* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the
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file are conforming to the base specification for that machine
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(there are no OS-specific extensions). In order to determine the
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real OS in use we must look for OS notes that have been added.
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For SDE, we simply look for sections named with .sde as prefixes. */
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bfd_map_over_sections (abfd,
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mips_sde_elf_osabi_sniff_abi_tag_sections,
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&osabi);
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}
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return osabi;
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}
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static void
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mips_sde_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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frame_unwind_append_unwinder (gdbarch, &mips_sde_frame_unwind);
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frame_base_append_sniffer (gdbarch, mips_sde_frame_base_sniffer);
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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extern initialize_file_ftype _initialize_mips_sde_tdep;
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void
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_initialize_mips_sde_tdep (void)
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{
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gdbarch_register_osabi_sniffer (bfd_arch_mips,
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bfd_target_elf_flavour,
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mips_sde_elf_osabi_sniffer);
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gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_SDE, mips_sde_init_abi);
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}
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