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https://github.com/tobast/libunwind-eh_elf.git
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118 lines
4.2 KiB
C
118 lines
4.2 KiB
C
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/* libunwind - a platform-independent unwind library
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Copyright (C) 2008 CodeSourcery
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Copyright 2011 Linaro Limited
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Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.com>
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#include "unwind_i.h"
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#include "offsets.h"
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PROTECTED int
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unw_handle_signal_frame (unw_cursor_t *cursor)
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{
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struct cursor *c = (struct cursor *) cursor;
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int ret;
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unw_word_t sc_addr, sp, sp_addr = c->dwarf.cfa;
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struct dwarf_loc sp_loc = DWARF_LOC (sp_addr, 0);
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if ((ret = dwarf_get (&c->dwarf, sp_loc, &sp)) < 0)
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return -UNW_EUNSPEC;
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ret = unw_is_signal_frame (cursor);
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Debug(1, "unw_is_signal_frame()=%d\n", ret);
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/* Save the SP and PC to be able to return execution at this point
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later in time (unw_resume). */
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c->sigcontext_sp = c->dwarf.cfa;
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c->sigcontext_pc = c->dwarf.ip;
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if (ret == 1)
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{
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/* Handle non-RT signal frame. */
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c->sigcontext_format = SH_SCF_LINUX_SIGFRAME;
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sc_addr = sp_addr;
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}
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else if (ret == 2)
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{
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/* Handle RT signal frame. */
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c->sigcontext_format = SH_SCF_LINUX_RT_SIGFRAME;
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sc_addr = sp_addr + sizeof (siginfo_t) + LINUX_UC_MCONTEXT_OFF;
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}
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else
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return -UNW_EUNSPEC;
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c->sigcontext_addr = sc_addr;
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/* Update the dwarf cursor.
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Set the location of the registers to the corresponding addresses of the
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uc_mcontext / sigcontext structure contents. */
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c->dwarf.loc[UNW_SH_R0] = DWARF_LOC (sc_addr + LINUX_SC_R0_OFF, 0);
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c->dwarf.loc[UNW_SH_R1] = DWARF_LOC (sc_addr + LINUX_SC_R1_OFF, 0);
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c->dwarf.loc[UNW_SH_R2] = DWARF_LOC (sc_addr + LINUX_SC_R2_OFF, 0);
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c->dwarf.loc[UNW_SH_R3] = DWARF_LOC (sc_addr + LINUX_SC_R3_OFF, 0);
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c->dwarf.loc[UNW_SH_R4] = DWARF_LOC (sc_addr + LINUX_SC_R4_OFF, 0);
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c->dwarf.loc[UNW_SH_R5] = DWARF_LOC (sc_addr + LINUX_SC_R5_OFF, 0);
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c->dwarf.loc[UNW_SH_R6] = DWARF_LOC (sc_addr + LINUX_SC_R6_OFF, 0);
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c->dwarf.loc[UNW_SH_R7] = DWARF_LOC (sc_addr + LINUX_SC_R7_OFF, 0);
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c->dwarf.loc[UNW_SH_R8] = DWARF_LOC (sc_addr + LINUX_SC_R8_OFF, 0);
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c->dwarf.loc[UNW_SH_R9] = DWARF_LOC (sc_addr + LINUX_SC_R9_OFF, 0);
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c->dwarf.loc[UNW_SH_R10] = DWARF_LOC (sc_addr + LINUX_SC_R10_OFF, 0);
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c->dwarf.loc[UNW_SH_R11] = DWARF_LOC (sc_addr + LINUX_SC_R11_OFF, 0);
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c->dwarf.loc[UNW_SH_R12] = DWARF_LOC (sc_addr + LINUX_SC_R12_OFF, 0);
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c->dwarf.loc[UNW_SH_R13] = DWARF_LOC (sc_addr + LINUX_SC_R13_OFF, 0);
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c->dwarf.loc[UNW_SH_R14] = DWARF_LOC (sc_addr + LINUX_SC_R14_OFF, 0);
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c->dwarf.loc[UNW_SH_R15] = DWARF_LOC (sc_addr + LINUX_SC_R15_OFF, 0);
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c->dwarf.loc[UNW_SH_PR] = DWARF_LOC (sc_addr + LINUX_SC_PR_OFF, 0);
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c->dwarf.loc[UNW_SH_PC] = DWARF_LOC (sc_addr + LINUX_SC_PC_OFF, 0);
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/* Set SP/CFA and PC/IP. */
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dwarf_get (&c->dwarf, c->dwarf.loc[UNW_SH_R15], &c->dwarf.cfa);
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dwarf_get (&c->dwarf, c->dwarf.loc[UNW_SH_PC], &c->dwarf.ip);
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c->dwarf.pi_valid = 0;
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return 1;
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}
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PROTECTED int
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unw_step (unw_cursor_t *cursor)
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{
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struct cursor *c = (struct cursor *) cursor;
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int ret;
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Debug (1, "(cursor=%p)\n", c);
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if (unw_is_signal_frame (cursor))
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return unw_handle_signal_frame (cursor);
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ret = dwarf_step (&c->dwarf);
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if (unlikely (ret == -UNW_ESTOPUNWIND))
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return ret;
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if (unlikely (ret < 0))
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return 0;
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return (c->dwarf.ip == 0) ? 0 : 1;
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}
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