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- /* libunwind - a platform-independent unwind library
- Copyright (C) 2002-2004 Hewlett-Packard Co
- Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
- 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. */
- #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, 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. On Linux, this is:
- __restore:
- 0x58 pop %eax
- 0xb8 0x77 0x00 0x00 0x00 movl 0x77,%eax
- 0xcd 0x80 int 0x80
- without SA_SIGINFO, and
- __restore_rt:
- 0xb8 0xad 0x00 0x00 0x00 movl 0xad,%eax
- 0xcd 0x80 int 0x80
- 0x00
- if SA_SIGINFO is specified.
- */
- ip = c->dwarf.ip;
- if ((ret = (*a->access_mem) (as, ip, &w0, 0, arg)) < 0
- || (ret = (*a->access_mem) (as, ip + 4, &w1, 0, arg)) < 0)
- return ret;
- ret = ((w0 == 0x0077b858 && w1 == 0x80cd0000)
- || (w0 == 0x0000adb8 && (w1 & 0xffffff) == 0x80cd00));
- Debug (16, "returning %d\n", ret);
- return ret;
- }
- PROTECTED int
- unw_handle_signal_frame (unw_cursor_t *cursor)
- {
- struct cursor *c = (struct cursor *) cursor;
- int ret;
- /* c->esp points at the arguments to the handler. Without
- SA_SIGINFO, the arguments consist of a signal number
- followed by a struct sigcontext. With SA_SIGINFO, the
- arguments consist a signal number, a siginfo *, and a
- ucontext *. */
- unw_word_t sc_addr;
- unw_word_t siginfo_ptr_addr = c->dwarf.cfa + 4;
- unw_word_t sigcontext_ptr_addr = c->dwarf.cfa + 8;
- unw_word_t siginfo_ptr, sigcontext_ptr;
- struct dwarf_loc esp_loc, siginfo_ptr_loc, sigcontext_ptr_loc;
- siginfo_ptr_loc = DWARF_LOC (siginfo_ptr_addr, 0);
- sigcontext_ptr_loc = DWARF_LOC (sigcontext_ptr_addr, 0);
- ret = (dwarf_get (&c->dwarf, siginfo_ptr_loc, &siginfo_ptr)
- | dwarf_get (&c->dwarf, sigcontext_ptr_loc, &sigcontext_ptr));
- if (ret < 0)
- {
- Debug (2, "returning 0\n");
- return 0;
- }
- if (siginfo_ptr < c->dwarf.cfa
- || siginfo_ptr > c->dwarf.cfa + 256
- || sigcontext_ptr < c->dwarf.cfa
- || sigcontext_ptr > c->dwarf.cfa + 256)
- {
- /* Not plausible for SA_SIGINFO signal */
- c->sigcontext_format = X86_SCF_LINUX_SIGFRAME;
- c->sigcontext_addr = sc_addr = c->dwarf.cfa + 4;
- }
- else
- {
- /* If SA_SIGINFO were not specified, we actually read
- various segment pointers instead. We believe that at
- least fs and _fsh are always zero for linux, so it is
- not just unlikely, but impossible that we would end
- up here. */
- c->sigcontext_format = X86_SCF_LINUX_RT_SIGFRAME;
- c->sigcontext_addr = sigcontext_ptr;
- sc_addr = sigcontext_ptr + LINUX_UC_MCONTEXT_OFF;
- }
- esp_loc = DWARF_LOC (sc_addr + LINUX_SC_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[EAX] = DWARF_LOC (sc_addr + LINUX_SC_EAX_OFF, 0);
- c->dwarf.loc[ECX] = DWARF_LOC (sc_addr + LINUX_SC_ECX_OFF, 0);
- c->dwarf.loc[EDX] = DWARF_LOC (sc_addr + LINUX_SC_EDX_OFF, 0);
- c->dwarf.loc[EBX] = DWARF_LOC (sc_addr + LINUX_SC_EBX_OFF, 0);
- c->dwarf.loc[EBP] = DWARF_LOC (sc_addr + LINUX_SC_EBP_OFF, 0);
- c->dwarf.loc[ESI] = DWARF_LOC (sc_addr + LINUX_SC_ESI_OFF, 0);
- c->dwarf.loc[EDI] = DWARF_LOC (sc_addr + LINUX_SC_EDI_OFF, 0);
- c->dwarf.loc[EFLAGS] = DWARF_NULL_LOC;
- c->dwarf.loc[TRAPNO] = DWARF_NULL_LOC;
- c->dwarf.loc[ST0] = DWARF_NULL_LOC;
- c->dwarf.loc[EIP] = DWARF_LOC (sc_addr + LINUX_SC_EIP_OFF, 0);
- c->dwarf.loc[ESP] = DWARF_LOC (sc_addr + LINUX_SC_ESP_OFF, 0);
- return 0;
- }
- HIDDEN dwarf_loc_t
- x86_get_scratch_loc (struct cursor *c, unw_regnum_t reg)
- {
- unw_word_t addr = c->sigcontext_addr, fpstate_addr, off;
- int ret, is_fpstate = 0;
- switch (c->sigcontext_format)
- {
- case X86_SCF_NONE:
- return DWARF_REG_LOC (&c->dwarf, reg);
- case X86_SCF_LINUX_SIGFRAME:
- break;
- case X86_SCF_LINUX_RT_SIGFRAME:
- addr += LINUX_UC_MCONTEXT_OFF;
- break;
- default:
- return DWARF_NULL_LOC;
- }
- switch (reg)
- {
- case UNW_X86_GS: off = LINUX_SC_GS_OFF; break;
- case UNW_X86_FS: off = LINUX_SC_FS_OFF; break;
- case UNW_X86_ES: off = LINUX_SC_ES_OFF; break;
- case UNW_X86_DS: off = LINUX_SC_DS_OFF; break;
- case UNW_X86_EDI: off = LINUX_SC_EDI_OFF; break;
- case UNW_X86_ESI: off = LINUX_SC_ESI_OFF; break;
- case UNW_X86_EBP: off = LINUX_SC_EBP_OFF; break;
- case UNW_X86_ESP: off = LINUX_SC_ESP_OFF; break;
- case UNW_X86_EBX: off = LINUX_SC_EBX_OFF; break;
- case UNW_X86_EDX: off = LINUX_SC_EDX_OFF; break;
- case UNW_X86_ECX: off = LINUX_SC_ECX_OFF; break;
- case UNW_X86_EAX: off = LINUX_SC_EAX_OFF; break;
- case UNW_X86_TRAPNO: off = LINUX_SC_TRAPNO_OFF; break;
- case UNW_X86_EIP: off = LINUX_SC_EIP_OFF; break;
- case UNW_X86_CS: off = LINUX_SC_CS_OFF; break;
- case UNW_X86_EFLAGS: off = LINUX_SC_EFLAGS_OFF; break;
- case UNW_X86_SS: off = LINUX_SC_SS_OFF; break;
- /* The following is probably not correct for all possible cases.
- Somebody who understands this better should review this for
- correctness. */
- case UNW_X86_FCW: is_fpstate = 1; off = LINUX_FPSTATE_CW_OFF; break;
- case UNW_X86_FSW: is_fpstate = 1; off = LINUX_FPSTATE_SW_OFF; break;
- case UNW_X86_FTW: is_fpstate = 1; off = LINUX_FPSTATE_TAG_OFF; break;
- case UNW_X86_FCS: is_fpstate = 1; off = LINUX_FPSTATE_CSSEL_OFF; break;
- case UNW_X86_FIP: is_fpstate = 1; off = LINUX_FPSTATE_IPOFF_OFF; break;
- case UNW_X86_FEA: is_fpstate = 1; off = LINUX_FPSTATE_DATAOFF_OFF; break;
- case UNW_X86_FDS: is_fpstate = 1; off = LINUX_FPSTATE_DATASEL_OFF; break;
- case UNW_X86_MXCSR: is_fpstate = 1; off = LINUX_FPSTATE_MXCSR_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 = LINUX_FPSTATE_ST0_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;
- off = LINUX_FPSTATE_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;
- off = LINUX_FPSTATE_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 + LINUX_SC_FPSTATE_OFF),
- &fpstate_addr)) < 0)
- return DWARF_NULL_LOC;
- if (!fpstate_addr)
- return DWARF_NULL_LOC;
- return DWARF_MEM_LOC (c, fpstate_addr + off);
- }
- else
- 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.gregs[REG_GS]; break;
- case UNW_X86_FS: addr = &uc->uc_mcontext.gregs[REG_FS]; break;
- case UNW_X86_ES: addr = &uc->uc_mcontext.gregs[REG_ES]; break;
- case UNW_X86_DS: addr = &uc->uc_mcontext.gregs[REG_DS]; break;
- case UNW_X86_EAX: addr = &uc->uc_mcontext.gregs[REG_EAX]; break;
- case UNW_X86_EBX: addr = &uc->uc_mcontext.gregs[REG_EBX]; break;
- case UNW_X86_ECX: addr = &uc->uc_mcontext.gregs[REG_ECX]; break;
- case UNW_X86_EDX: addr = &uc->uc_mcontext.gregs[REG_EDX]; break;
- case UNW_X86_ESI: addr = &uc->uc_mcontext.gregs[REG_ESI]; break;
- case UNW_X86_EDI: addr = &uc->uc_mcontext.gregs[REG_EDI]; break;
- case UNW_X86_EBP: addr = &uc->uc_mcontext.gregs[REG_EBP]; break;
- case UNW_X86_EIP: addr = &uc->uc_mcontext.gregs[REG_EIP]; break;
- case UNW_X86_ESP: addr = &uc->uc_mcontext.gregs[REG_ESP]; break;
- case UNW_X86_TRAPNO: addr = &uc->uc_mcontext.gregs[REG_TRAPNO]; break;
- case UNW_X86_CS: addr = &uc->uc_mcontext.gregs[REG_CS]; break;
- case UNW_X86_EFLAGS: addr = &uc->uc_mcontext.gregs[REG_EFL]; break;
- case UNW_X86_SS: addr = &uc->uc_mcontext.gregs[REG_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 (unlikely (c->sigcontext_format != X86_SCF_NONE))
- {
- #if (!HAVE_SGX)
- struct sigcontext *sc = (struct sigcontext *) c->sigcontext_addr;
- Debug (8, "resuming at ip=%x via sigreturn(%p)\n", c->dwarf.ip, sc);
- sigreturn (sc);
- #endif
- }
- else
- {
- Debug (8, "resuming at ip=%x via setcontext()\n", c->dwarf.ip);
- setcontext (uc);
- }
- return -UNW_EINVAL;
- }
- #endif
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