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- /* libunwind - a platform-independent unwind library
- Copyright (C) 2010 Konstantin Belousov <kib@freebsd.org>
- This file is part of libunwind.
- Permission is hereby granted, free of charge, to any person obtaining
- a copy of this software and associated documentation files (the
- "Software"), to deal in the Software without restriction, including
- without limitation the rights to use, copy, modify, merge, publish,
- distribute, sublicense, and/or sell copies of the Software, and to
- permit persons to whom the Software is furnished to do so, subject to
- the following conditions:
- The above copyright notice and this permission notice shall be
- included in all copies or substantial portions of the Software.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
- #include <sys/types.h>
- #include <signal.h>
- #include <stddef.h>
- #include <ucontext.h>
- #include <machine/sigframe.h>
- #include "unwind_i.h"
- #include "offsets.h"
- PROTECTED int
- unw_is_signal_frame (unw_cursor_t *cursor)
- {
- struct cursor *c = (struct cursor *) cursor;
- unw_word_t w0, w1, w2, w3, w4, w5, ip;
- unw_addr_space_t as;
- unw_accessors_t *a;
- void *arg;
- int ret;
- as = c->dwarf.as;
- a = unw_get_accessors (as);
- arg = c->dwarf.as_arg;
- /* Check if EIP points at sigreturn() sequence. It can be:
- sigcode+4: from amd64 freebsd32 environment
- 8d 44 24 20 lea 0x20(%esp),%eax
- 50 push %eax
- b8 a1 01 00 00 mov $0x1a1,%eax
- 50 push %eax
- cd 80 int $0x80
- sigcode+4: from real i386
- 8d 44 24 20 lea 0x20(%esp),%eax
- 50 push %eax
- f7 40 54 00 02 00 testl $0x20000,0x54(%eax)
- 75 03 jne sigcode+21
- 8e 68 14 mov 0x14(%eax),%gs
- b8 a1 01 00 00 mov $0x1a1,%eax
- 50 push %eax
- cd 80 int $0x80
- freebsd4_sigcode+4:
- XXX
- osigcode:
- XXX
- */
- ip = c->dwarf.ip;
- ret = X86_SCF_NONE;
- c->sigcontext_format = ret;
- if ((*a->access_mem) (as, ip, &w0, 0, arg) < 0 ||
- (*a->access_mem) (as, ip + 4, &w1, 0, arg) < 0 ||
- (*a->access_mem) (as, ip + 8, &w2, 0, arg) < 0 ||
- (*a->access_mem) (as, ip + 12, &w3, 0, arg) < 0)
- return ret;
- if (w0 == 0x2024448d && w1 == 0x01a1b850 && w2 == 0xcd500000 &&
- (w3 & 0xff) == 0x80)
- ret = X86_SCF_FREEBSD_SIGFRAME;
- else {
- if ((*a->access_mem) (as, ip + 16, &w4, 0, arg) < 0 ||
- (*a->access_mem) (as, ip + 20, &w5, 0, arg) < 0)
- return ret;
- if (w0 == 0x2024448d && w1 == 0x5440f750 && w2 == 0x75000200 &&
- w3 == 0x14688e03 && w4 == 0x0001a1b8 && w5 == 0x80cd5000)
- ret = X86_SCF_FREEBSD_SIGFRAME;
- }
- Debug (16, "returning %d\n", ret);
- c->sigcontext_format = ret;
- return (ret);
- }
- PROTECTED int
- unw_handle_signal_frame (unw_cursor_t *cursor)
- {
- struct cursor *c = (struct cursor *) cursor;
- int ret;
- if (c->sigcontext_format == X86_SCF_FREEBSD_SIGFRAME) {
- struct sigframe *sf;
- uintptr_t uc_addr;
- struct dwarf_loc esp_loc;
- sf = (struct sigframe *)c->dwarf.cfa;
- uc_addr = (uintptr_t)&(sf->sf_uc);
- c->sigcontext_addr = c->dwarf.cfa;
- esp_loc = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_ESP_OFF, 0);
- ret = dwarf_get (&c->dwarf, esp_loc, &c->dwarf.cfa);
- if (ret < 0)
- {
- Debug (2, "returning 0\n");
- return 0;
- }
- c->dwarf.loc[EIP] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_EIP_OFF, 0);
- c->dwarf.loc[ESP] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_ESP_OFF, 0);
- c->dwarf.loc[EAX] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_EAX_OFF, 0);
- c->dwarf.loc[ECX] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_ECX_OFF, 0);
- c->dwarf.loc[EDX] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_EDX_OFF, 0);
- c->dwarf.loc[EBX] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_EBX_OFF, 0);
- c->dwarf.loc[EBP] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_EBP_OFF, 0);
- c->dwarf.loc[ESI] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_ESI_OFF, 0);
- c->dwarf.loc[EDI] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_EDI_OFF, 0);
- c->dwarf.loc[EFLAGS] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_EFLAGS_OFF, 0);
- c->dwarf.loc[TRAPNO] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_TRAPNO_OFF, 0);
- c->dwarf.loc[ST0] = DWARF_NULL_LOC;
- } else {
- Debug (8, "Gstep: not handling frame format %d\n", c->sigcontext_format);
- abort();
- }
- return 0;
- }
- HIDDEN dwarf_loc_t
- x86_get_scratch_loc (struct cursor *c, unw_regnum_t reg)
- {
- unw_word_t addr = c->sigcontext_addr, off, xmm_off;
- unw_word_t fpstate, fpformat;
- int ret, is_fpstate = 0, is_xmmstate = 0;
- switch (c->sigcontext_format)
- {
- case X86_SCF_NONE:
- return DWARF_REG_LOC (&c->dwarf, reg);
- case X86_SCF_FREEBSD_SIGFRAME:
- addr += offsetof(struct sigframe, sf_uc) + FREEBSD_UC_MCONTEXT_OFF;
- break;
- case X86_SCF_FREEBSD_SIGFRAME4:
- abort();
- break;
- case X86_SCF_FREEBSD_OSIGFRAME:
- /* XXXKIB */
- abort();
- break;
- case X86_SCF_FREEBSD_SYSCALL:
- /* XXXKIB */
- abort();
- break;
- default:
- /* XXXKIB */
- abort();
- break;
- }
- off = 0; /* shut gcc warning */
- switch (reg)
- {
- case UNW_X86_GS: off = FREEBSD_UC_MCONTEXT_GS_OFF; break;
- case UNW_X86_FS: off = FREEBSD_UC_MCONTEXT_FS_OFF; break;
- case UNW_X86_ES: off = FREEBSD_UC_MCONTEXT_ES_OFF; break;
- case UNW_X86_DS: off = FREEBSD_UC_MCONTEXT_SS_OFF; break;
- case UNW_X86_EDI: off = FREEBSD_UC_MCONTEXT_EDI_OFF; break;
- case UNW_X86_ESI: off = FREEBSD_UC_MCONTEXT_ESI_OFF; break;
- case UNW_X86_EBP: off = FREEBSD_UC_MCONTEXT_EBP_OFF; break;
- case UNW_X86_ESP: off = FREEBSD_UC_MCONTEXT_ESP_OFF; break;
- case UNW_X86_EBX: off = FREEBSD_UC_MCONTEXT_EBX_OFF; break;
- case UNW_X86_EDX: off = FREEBSD_UC_MCONTEXT_EDX_OFF; break;
- case UNW_X86_ECX: off = FREEBSD_UC_MCONTEXT_ECX_OFF; break;
- case UNW_X86_EAX: off = FREEBSD_UC_MCONTEXT_EAX_OFF; break;
- case UNW_X86_TRAPNO: off = FREEBSD_UC_MCONTEXT_TRAPNO_OFF; break;
- case UNW_X86_EIP: off = FREEBSD_UC_MCONTEXT_EIP_OFF; break;
- case UNW_X86_CS: off = FREEBSD_UC_MCONTEXT_CS_OFF; break;
- case UNW_X86_EFLAGS: off = FREEBSD_UC_MCONTEXT_EFLAGS_OFF; break;
- case UNW_X86_SS: off = FREEBSD_UC_MCONTEXT_SS_OFF; break;
- case UNW_X86_FCW:
- is_fpstate = 1;
- off = FREEBSD_UC_MCONTEXT_CW_OFF;
- xmm_off = FREEBSD_UC_MCONTEXT_CW_XMM_OFF;
- break;
- case UNW_X86_FSW:
- is_fpstate = 1;
- off = FREEBSD_UC_MCONTEXT_SW_OFF;
- xmm_off = FREEBSD_UC_MCONTEXT_SW_XMM_OFF;
- break;
- case UNW_X86_FTW:
- is_fpstate = 1;
- xmm_off = FREEBSD_UC_MCONTEXT_TAG_XMM_OFF;
- off = FREEBSD_UC_MCONTEXT_TAG_OFF;
- break;
- case UNW_X86_FCS:
- is_fpstate = 1;
- off = FREEBSD_UC_MCONTEXT_CSSEL_OFF;
- xmm_off = FREEBSD_UC_MCONTEXT_CSSEL_XMM_OFF;
- break;
- case UNW_X86_FIP:
- is_fpstate = 1;
- off = FREEBSD_UC_MCONTEXT_IPOFF_OFF;
- xmm_off = FREEBSD_UC_MCONTEXT_IPOFF_XMM_OFF;
- break;
- case UNW_X86_FEA:
- is_fpstate = 1;
- off = FREEBSD_UC_MCONTEXT_DATAOFF_OFF;
- xmm_off = FREEBSD_UC_MCONTEXT_DATAOFF_XMM_OFF;
- break;
- case UNW_X86_FDS:
- is_fpstate = 1;
- off = FREEBSD_US_MCONTEXT_DATASEL_OFF;
- xmm_off = FREEBSD_US_MCONTEXT_DATASEL_XMM_OFF;
- break;
- case UNW_X86_MXCSR:
- is_fpstate = 1;
- is_xmmstate = 1;
- xmm_off = FREEBSD_UC_MCONTEXT_MXCSR_XMM_OFF;
- break;
- /* stacked fp registers */
- case UNW_X86_ST0: case UNW_X86_ST1: case UNW_X86_ST2: case UNW_X86_ST3:
- case UNW_X86_ST4: case UNW_X86_ST5: case UNW_X86_ST6: case UNW_X86_ST7:
- is_fpstate = 1;
- off = FREEBSD_UC_MCONTEXT_ST0_OFF + 10*(reg - UNW_X86_ST0);
- xmm_off = FREEBSD_UC_MCONTEXT_ST0_XMM_OFF + 10*(reg - UNW_X86_ST0);
- break;
- /* SSE fp registers */
- case UNW_X86_XMM0_lo: case UNW_X86_XMM0_hi:
- case UNW_X86_XMM1_lo: case UNW_X86_XMM1_hi:
- case UNW_X86_XMM2_lo: case UNW_X86_XMM2_hi:
- case UNW_X86_XMM3_lo: case UNW_X86_XMM3_hi:
- case UNW_X86_XMM4_lo: case UNW_X86_XMM4_hi:
- case UNW_X86_XMM5_lo: case UNW_X86_XMM5_hi:
- case UNW_X86_XMM6_lo: case UNW_X86_XMM6_hi:
- case UNW_X86_XMM7_lo: case UNW_X86_XMM7_hi:
- is_fpstate = 1;
- is_xmmstate = 1;
- xmm_off = FREEBSD_UC_MCONTEXT_XMM0_OFF + 8*(reg - UNW_X86_XMM0_lo);
- break;
- case UNW_X86_XMM0:
- case UNW_X86_XMM1:
- case UNW_X86_XMM2:
- case UNW_X86_XMM3:
- case UNW_X86_XMM4:
- case UNW_X86_XMM5:
- case UNW_X86_XMM6:
- case UNW_X86_XMM7:
- is_fpstate = 1;
- is_xmmstate = 1;
- xmm_off = FREEBSD_UC_MCONTEXT_XMM0_OFF + 16*(reg - UNW_X86_XMM0);
- break;
- case UNW_X86_FOP:
- case UNW_X86_TSS:
- case UNW_X86_LDT:
- default:
- return DWARF_REG_LOC (&c->dwarf, reg);
- }
- if (is_fpstate)
- {
- if ((ret = dwarf_get (&c->dwarf,
- DWARF_MEM_LOC (&c->dwarf, addr + FREEBSD_UC_MCONTEXT_FPSTATE_OFF),
- &fpstate)) < 0)
- return DWARF_NULL_LOC;
- if (fpstate == FREEBSD_UC_MCONTEXT_FPOWNED_NONE)
- return DWARF_NULL_LOC;
- if ((ret = dwarf_get (&c->dwarf,
- DWARF_MEM_LOC (&c->dwarf, addr + FREEBSD_UC_MCONTEXT_FPFORMAT_OFF),
- &fpformat)) < 0)
- return DWARF_NULL_LOC;
- if (fpformat == FREEBSD_UC_MCONTEXT_FPFMT_NODEV ||
- (is_xmmstate && fpformat != FREEBSD_UC_MCONTEXT_FPFMT_XMM))
- return DWARF_NULL_LOC;
- if (is_xmmstate)
- off = xmm_off;
- }
- return DWARF_MEM_LOC (c, addr + off);
- }
- #ifndef UNW_REMOTE_ONLY
- HIDDEN void *
- x86_r_uc_addr (ucontext_t *uc, int reg)
- {
- void *addr;
- switch (reg)
- {
- case UNW_X86_GS: addr = &uc->uc_mcontext.mc_gs; break;
- case UNW_X86_FS: addr = &uc->uc_mcontext.mc_fs; break;
- case UNW_X86_ES: addr = &uc->uc_mcontext.mc_es; break;
- case UNW_X86_DS: addr = &uc->uc_mcontext.mc_ds; break;
- case UNW_X86_EAX: addr = &uc->uc_mcontext.mc_eax; break;
- case UNW_X86_EBX: addr = &uc->uc_mcontext.mc_ebx; break;
- case UNW_X86_ECX: addr = &uc->uc_mcontext.mc_ecx; break;
- case UNW_X86_EDX: addr = &uc->uc_mcontext.mc_edx; break;
- case UNW_X86_ESI: addr = &uc->uc_mcontext.mc_esi; break;
- case UNW_X86_EDI: addr = &uc->uc_mcontext.mc_edi; break;
- case UNW_X86_EBP: addr = &uc->uc_mcontext.mc_ebp; break;
- case UNW_X86_EIP: addr = &uc->uc_mcontext.mc_eip; break;
- case UNW_X86_ESP: addr = &uc->uc_mcontext.mc_esp; break;
- case UNW_X86_TRAPNO: addr = &uc->uc_mcontext.mc_trapno; break;
- case UNW_X86_CS: addr = &uc->uc_mcontext.mc_cs; break;
- case UNW_X86_EFLAGS: addr = &uc->uc_mcontext.mc_eflags; break;
- case UNW_X86_SS: addr = &uc->uc_mcontext.mc_ss; break;
- default:
- addr = NULL;
- }
- return addr;
- }
- HIDDEN int
- x86_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg)
- {
- struct cursor *c = (struct cursor *) cursor;
- ucontext_t *uc = c->uc;
- /* Ensure c->pi is up-to-date. On x86, it's relatively common to be
- missing DWARF unwind info. We don't want to fail in that case,
- because the frame-chain still would let us do a backtrace at
- least. */
- dwarf_make_proc_info (&c->dwarf);
- if (c->sigcontext_format == X86_SCF_NONE) {
- Debug (8, "resuming at ip=%x via setcontext()\n", c->dwarf.ip);
- setcontext (uc);
- abort();
- } else if (c->sigcontext_format == X86_SCF_FREEBSD_SIGFRAME) {
- struct sigcontext *sc = (struct sigcontext *) c->sigcontext_addr;
- Debug (8, "resuming at ip=%x via sigreturn(%p)\n", c->dwarf.ip, sc);
- sigreturn((ucontext_t *)((const char *)sc + FREEBSD_SC_UCONTEXT_OFF));
- abort();
- } else {
- Debug (8, "resuming at ip=%x for sigcontext format %d not implemented\n",
- c->dwarf.ip, c->sigcontext_format);
- abort();
- }
- return -UNW_EINVAL;
- }
- #endif
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