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79c2c254a7
Add MIPS support to the coredump library. Explicit support for the MIPS program counter register is added so that we can start backtracing from the program counter value we read from a core dump. The PC register support was not strictly required for local backtracing, and we will in fact just plug the return address to the PC register in getcontext(). I have only tested the 32bit "OABI" paths.
60 lines
2 KiB
C
60 lines
2 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2008 CodeSourcery
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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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static inline int
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common_init (struct cursor *c, unsigned use_prev_instr)
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{
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int ret, i;
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for (i = 0; i < 32; i++)
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c->dwarf.loc[i] = DWARF_REG_LOC (&c->dwarf, UNW_MIPS_R0 + i);
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for (i = 32; i < DWARF_NUM_PRESERVED_REGS; ++i)
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c->dwarf.loc[i] = DWARF_NULL_LOC;
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c->dwarf.loc[UNW_MIPS_PC] = DWARF_REG_LOC (&c->dwarf, UNW_MIPS_PC);
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ret = dwarf_get (&c->dwarf, c->dwarf.loc[UNW_MIPS_PC], &c->dwarf.ip);
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if (ret < 0)
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return ret;
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ret = dwarf_get (&c->dwarf, DWARF_REG_LOC (&c->dwarf, UNW_MIPS_R29),
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&c->dwarf.cfa);
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if (ret < 0)
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return ret;
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/* FIXME: Initialisation for other registers. */
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c->dwarf.args_size = 0;
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c->dwarf.ret_addr_column = 0;
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c->dwarf.stash_frames = 0;
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c->dwarf.use_prev_instr = use_prev_instr;
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c->dwarf.pi_valid = 0;
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c->dwarf.pi_is_dynamic = 0;
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c->dwarf.hint = 0;
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c->dwarf.prev_rs = 0;
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return 0;
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}
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