359 lines
9.7 KiB
C
359 lines
9.7 KiB
C
/* Target-dependent code for PowerPC systems running FreeBSD.
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Copyright (C) 2013-2014 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 "arch-utils.h"
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#include "frame.h"
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#include "gdbcore.h"
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#include "frame-unwind.h"
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#include "gdbtypes.h"
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#include "osabi.h"
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#include "regcache.h"
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#include "regset.h"
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#include "symtab.h"
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#include "target.h"
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#include "trad-frame.h"
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#include "gdb_assert.h"
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#include <string.h>
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#include "ppc-tdep.h"
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#include "ppc64-tdep.h"
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#include "ppcfbsd-tdep.h"
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#include "solib-svr4.h"
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/* 32-bit regset descriptions. */
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static const struct ppc_reg_offsets ppc32_fbsd_reg_offsets =
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{
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/* General-purpose registers. */
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/* .r0_offset = */ 0,
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/* .gpr_size = */ 4,
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/* .xr_size = */ 4,
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/* .pc_offset = */ 144,
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/* .ps_offset = */ -1,
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/* .cr_offset = */ 132,
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/* .lr_offset = */ 128,
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/* .ctr_offset = */ 140,
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/* .xer_offset = */ 136,
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/* .mq_offset = */ -1,
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/* Floating-point registers. */
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/* .f0_offset = */ 0,
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/* .fpscr_offset = */ 256,
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/* .fpscr_size = */ 8,
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#ifdef NOTYET
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/* AltiVec registers. */
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/* .vr0_offset = */ 0,
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/* .vscr_offset = */ 512 + 12,
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/* .vrsave_offset = */ 512
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#endif
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};
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/* 64-bit regset descriptions. */
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static const struct ppc_reg_offsets ppc64_fbsd_reg_offsets =
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{
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/* General-purpose registers. */
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/* .r0_offset = */ 0,
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/* .gpr_size = */ 8,
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/* .xr_size = */ 8,
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/* .pc_offset = */ 288,
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/* .ps_offset = */ -1,
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/* .cr_offset = */ 264,
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/* .lr_offset = */ 256,
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/* .ctr_offset = */ 280,
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/* .xer_offset = */ 272,
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/* .mq_offset = */ -1,
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/* Floating-point registers. */
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/* .f0_offset = */ 0,
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/* .fpscr_offset = */ 256,
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/* .fpscr_size = */ 8,
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#ifdef NOYET
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/* AltiVec registers. */
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/* .vr0_offset = */ 0,
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/* .vscr_offset = */ 512 + 12,
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/* .vrsave_offset = */ 528
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#endif
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};
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/* 32-bit general-purpose register set. */
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static const struct regset ppc32_fbsd_gregset = {
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&ppc32_fbsd_reg_offsets,
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ppc_supply_gregset,
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ppc_collect_gregset,
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NULL
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};
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/* 64-bit general-purpose register set. */
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static const struct regset ppc64_fbsd_gregset = {
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&ppc64_fbsd_reg_offsets,
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ppc_supply_gregset,
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ppc_collect_gregset,
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NULL
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};
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/* 32-/64-bit floating-point register set. */
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static const struct regset ppc32_fbsd_fpregset = {
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&ppc32_fbsd_reg_offsets,
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ppc_supply_fpregset,
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ppc_collect_fpregset
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};
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const struct regset *
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ppc_fbsd_gregset (int wordsize)
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{
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return wordsize == 8 ? &ppc64_fbsd_gregset : &ppc32_fbsd_gregset;
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}
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const struct regset *
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ppc_fbsd_fpregset (void)
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{
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return &ppc32_fbsd_fpregset;
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}
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/* Return the appropriate register set for the core section identified
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by SECT_NAME and SECT_SIZE. */
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static const struct regset *
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ppcfbsd_regset_from_core_section (struct gdbarch *gdbarch,
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const char *sect_name, size_t sect_size)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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if (strcmp (sect_name, ".reg") == 0 && sect_size >= 148)
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{
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if (tdep->wordsize == 4)
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return &ppc32_fbsd_gregset;
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else
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return &ppc64_fbsd_gregset;
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}
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if (strcmp (sect_name, ".reg2") == 0 && sect_size >= 264)
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return &ppc32_fbsd_fpregset;
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return NULL;
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}
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/* Default page size. */
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static const int ppcfbsd_page_size = 4096;
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/* Offset for sigreturn(2). */
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static const int ppcfbsd_sigreturn_offset[] = {
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0xc, /* FreeBSD 32-bit */
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-1
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};
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/* Signal trampolines. */
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static int
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ppcfbsd_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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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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CORE_ADDR pc = get_frame_pc (this_frame);
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CORE_ADDR start_pc = (pc & ~(ppcfbsd_page_size - 1));
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const int *offset;
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const char *name;
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/* A stack trampoline is detected if no name is associated
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to the current pc and if it points inside a trampoline
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sequence. */
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find_pc_partial_function (pc, &name, NULL, NULL);
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/* If we have a name, we have no trampoline, return. */
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if (name)
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return 0;
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for (offset = ppcfbsd_sigreturn_offset; *offset != -1; offset++)
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{
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gdb_byte buf[2 * PPC_INSN_SIZE];
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unsigned long insn;
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if (!safe_frame_unwind_memory (this_frame, start_pc + *offset,
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buf, sizeof buf))
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continue;
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/* Check for "li r0,SYS_sigreturn". */
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insn = extract_unsigned_integer (buf, PPC_INSN_SIZE, byte_order);
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if (insn != 0x380001a1)
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continue;
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/* Check for "sc". */
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insn = extract_unsigned_integer (buf + PPC_INSN_SIZE,
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PPC_INSN_SIZE, byte_order);
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if (insn != 0x44000002)
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continue;
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return 1;
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}
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return 0;
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}
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static struct trad_frame_cache *
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ppcfbsd_sigtramp_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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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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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, base, func;
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gdb_byte buf[PPC_INSN_SIZE];
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int i;
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if (*this_cache)
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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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func = get_frame_pc (this_frame);
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func &= ~(ppcfbsd_page_size - 1);
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if (!safe_frame_unwind_memory (this_frame, func, buf, sizeof buf))
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return cache;
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base = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch));
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addr = base + 0x10 + 2 * tdep->wordsize;
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for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize)
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{
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int regnum = i + tdep->ppc_gp0_regnum;
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trad_frame_set_reg_addr (cache, regnum, addr);
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}
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trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, addr);
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addr += tdep->wordsize;
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trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, addr);
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addr += tdep->wordsize;
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trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, addr);
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addr += tdep->wordsize;
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trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, addr);
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addr += tdep->wordsize;
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trad_frame_set_reg_addr (cache, gdbarch_pc_regnum (gdbarch), addr);
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/* SRR0? */
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addr += tdep->wordsize;
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/* Construct the frame ID using the function start. */
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trad_frame_set_id (cache, frame_id_build (base, func));
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return cache;
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}
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static void
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ppcfbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
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void **this_cache, struct frame_id *this_id)
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{
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struct trad_frame_cache *cache =
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ppcfbsd_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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ppcfbsd_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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struct trad_frame_cache *cache =
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ppcfbsd_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 const struct frame_unwind ppcfbsd_sigtramp_frame_unwind = {
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SIGTRAMP_FRAME,
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default_frame_unwind_stop_reason,
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ppcfbsd_sigtramp_frame_this_id,
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ppcfbsd_sigtramp_frame_prev_register,
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NULL,
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ppcfbsd_sigtramp_frame_sniffer
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};
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static enum return_value_convention
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ppcfbsd_return_value (struct gdbarch *gdbarch, struct value *function,
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struct type *valtype, struct regcache *regcache,
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gdb_byte *readbuf, const gdb_byte *writebuf)
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{
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return ppc_sysv_abi_broken_return_value (gdbarch, function, valtype,
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regcache, readbuf, writebuf);
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}
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static void
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ppcfbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* FreeBSD doesn't support the 128-bit `long double' from the psABI. */
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set_gdbarch_long_double_bit (gdbarch, 64);
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set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
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if (tdep->wordsize == 4)
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{
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set_gdbarch_return_value (gdbarch, ppcfbsd_return_value);
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set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
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set_solib_svr4_fetch_link_map_offsets (gdbarch,
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svr4_ilp32_fetch_link_map_offsets);
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frame_unwind_append_unwinder (gdbarch, &ppcfbsd_sigtramp_frame_unwind);
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set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc");
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}
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if (tdep->wordsize == 8)
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{
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set_gdbarch_convert_from_func_ptr_addr
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(gdbarch, ppc64_convert_from_func_ptr_addr);
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set_gdbarch_elf_make_msymbol_special (gdbarch,
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ppc64_elf_make_msymbol_special);
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set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code);
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set_solib_svr4_fetch_link_map_offsets (gdbarch,
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svr4_lp64_fetch_link_map_offsets);
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set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc");
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}
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set_gdbarch_regset_from_core_section
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(gdbarch, ppcfbsd_regset_from_core_section);
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set_gdbarch_fetch_tls_load_module_address (gdbarch,
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svr4_fetch_objfile_link_map);
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_ppcfbsd_tdep (void);
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void
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_initialize_ppcfbsd_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_FREEBSD_ELF,
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ppcfbsd_init_abi);
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gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64,
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GDB_OSABI_FREEBSD_ELF,
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ppcfbsd_init_abi);
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gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_FREEBSD_ELF,
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ppcfbsd_init_abi);
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}
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