mirror of
https://github.com/tobast/libunwind-eh_elf.git
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9e98f15e9a
Adds new function to perform a pure stack walk without unwinding, functionally similar to backtrace() but accelerated by an address attribute cache the caller maintains across calls.
96 lines
4.1 KiB
C
96 lines
4.1 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2010 by Lassi Tuura <lat@iki.fi>
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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 "ucontext_i.h"
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HIDDEN void
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tdep_stash_frame (struct dwarf_cursor *d, struct dwarf_reg_state *rs)
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{
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struct cursor *c = (struct cursor *) dwarf_to_cursor (d);
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unw_tdep_frame_t *f = &c->frame_info;
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Debug (4, "ip=0x%lx cfa=0x%lx type %d cfa [where=%d val=%ld] cfaoff=%ld"
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" ra=0x%lx rbp [where=%d val=%ld @0x%lx] rsp [where=%d val=%ld @0x%lx]\n",
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d->ip, d->cfa, f->frame_type,
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rs->reg[DWARF_CFA_REG_COLUMN].where,
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rs->reg[DWARF_CFA_REG_COLUMN].val,
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rs->reg[DWARF_CFA_OFF_COLUMN].val,
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DWARF_GET_LOC(d->loc[d->ret_addr_column]),
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rs->reg[RBP].where, rs->reg[RBP].val, DWARF_GET_LOC(d->loc[RBP]),
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rs->reg[RSP].where, rs->reg[RSP].val, DWARF_GET_LOC(d->loc[RSP]));
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/* A standard frame is defined as:
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- CFA is register-relative offset off RBP or RSP;
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- Return address is saved at CFA-8;
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- RBP is unsaved or saved at CFA+offset, offset != -1;
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- RSP is unsaved or saved at CFA+offset, offset != -1. */
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if (f->frame_type == UNW_X86_64_FRAME_OTHER
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&& (rs->reg[DWARF_CFA_REG_COLUMN].where == DWARF_WHERE_REG)
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&& (rs->reg[DWARF_CFA_REG_COLUMN].val == RBP
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|| rs->reg[DWARF_CFA_REG_COLUMN].val == RSP)
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&& labs(rs->reg[DWARF_CFA_OFF_COLUMN].val) < (1 << 29)
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&& DWARF_GET_LOC(d->loc[d->ret_addr_column]) == d->cfa-8
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&& (rs->reg[RBP].where == DWARF_WHERE_UNDEF
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|| rs->reg[RBP].where == DWARF_WHERE_SAME
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|| (rs->reg[RBP].where == DWARF_WHERE_CFAREL
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&& labs(rs->reg[RBP].val) < (1 << 14)
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&& rs->reg[RBP].val+1 != 0))
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&& (rs->reg[RSP].where == DWARF_WHERE_UNDEF
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|| rs->reg[RSP].where == DWARF_WHERE_SAME
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|| (rs->reg[RSP].where == DWARF_WHERE_CFAREL
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&& labs(rs->reg[RSP].val) < (1 << 14)
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&& rs->reg[RSP].val+1 != 0)))
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{
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/* Save information for a standard frame. */
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f->frame_type = UNW_X86_64_FRAME_STANDARD;
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f->cfa_reg_rsp = (rs->reg[DWARF_CFA_REG_COLUMN].val == RSP);
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f->cfa_reg_offset = rs->reg[DWARF_CFA_OFF_COLUMN].val;
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if (rs->reg[RBP].where == DWARF_WHERE_CFAREL)
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f->rbp_cfa_offset = rs->reg[RBP].val;
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if (rs->reg[RSP].where == DWARF_WHERE_CFAREL)
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f->rsp_cfa_offset = rs->reg[RSP].val;
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Debug (4, " standard frame\n");
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}
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/* Signal frame was detected via augmentation in tdep_fetch_frame()
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and partially filled in tdep_reuse_frame(). Now that we have
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the delta between inner and outer CFAs available to use, fill in
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the offsets for CFA and stored registers. We don't have space
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for RIP, it's location is calculated relative to RBP location. */
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else if (f->frame_type == UNW_X86_64_FRAME_SIGRETURN)
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{
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assert (f->cfa_reg_offset == -1);
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f->cfa_reg_offset = d->cfa - c->sigcontext_addr;
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f->rbp_cfa_offset = DWARF_GET_LOC(d->loc[RBP]) - d->cfa;
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f->rsp_cfa_offset = DWARF_GET_LOC(d->loc[RSP]) - d->cfa;
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Debug (4, " sigreturn frame rbpoff %d rspoff %d\n",
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f->rbp_cfa_offset, f->rsp_cfa_offset);
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}
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/* PLT and guessed RBP-walked frames are handled in unw_step(). */
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else
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Debug (4, " unusual frame\n");
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}
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