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5f38f35d5d
Dropping the extra frame for unw_backtrace itself using unw_step is approximately 15% slower than skipping the frame in tdep_trace. So drop the frame in the latter, and make the function a private implementation detail for libunwind, not an exported interface. Also moves unw_getcontext call back into unw_backtrace to avoid an extra call frame in case slow_backtrace does not get inlined into unw_backtrace.
187 lines
5.8 KiB
C
187 lines
5.8 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2002-2004 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.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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#ifndef LIBUNWIND_H
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#define LIBUNWIND_H
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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#include <sys/types.h>
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#include <inttypes.h>
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#include <ucontext.h>
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#define UNW_TARGET x86
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#define UNW_TARGET_X86 1
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#define _U_TDEP_QP_TRUE 0 /* see libunwind-dynamic.h */
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/* This needs to be big enough to accommodate "struct cursor", while
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leaving some slack for future expansion. Changing this value will
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require recompiling all users of this library. Stack allocation is
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relatively cheap and unwind-state copying is relatively rare, so we
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want to err on making it rather too big than too small. */
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#define UNW_TDEP_CURSOR_LEN 127
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typedef uint32_t unw_word_t;
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typedef int32_t unw_sword_t;
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typedef union {
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struct { uint8_t b[4]; } val32;
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struct { uint8_t b[10]; } val80;
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struct { uint8_t b[16]; } val128;
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} unw_tdep_fpreg_t;
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typedef enum
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{
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/* Note: general registers are expected to start with index 0.
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This convention facilitates architecture-independent
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implementation of the C++ exception handling ABI. See
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_Unwind_SetGR() and _Unwind_GetGR() for details.
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The described register usage convention is based on "System V
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Application Binary Interface, Intel386 Architecture Processor
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Supplement, Fourth Edition" at
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http://www.linuxbase.org/spec/refspecs/elf/abi386-4.pdf
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It would have been nice to use the same register numbering as
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DWARF, but that doesn't work because the libunwind requires
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that the exception argument registers be consecutive, which the
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wouldn't be with the DWARF numbering. */
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UNW_X86_EAX, /* scratch (exception argument 1) */
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UNW_X86_EDX, /* scratch (exception argument 2) */
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UNW_X86_ECX, /* scratch */
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UNW_X86_EBX, /* preserved */
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UNW_X86_ESI, /* preserved */
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UNW_X86_EDI, /* preserved */
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UNW_X86_EBP, /* (optional) frame-register */
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UNW_X86_ESP, /* (optional) frame-register */
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UNW_X86_EIP, /* frame-register */
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UNW_X86_EFLAGS, /* scratch (except for "direction", which is fixed */
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UNW_X86_TRAPNO, /* scratch */
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/* MMX/stacked-fp registers */
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UNW_X86_ST0, /* fp return value */
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UNW_X86_ST1, /* scratch */
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UNW_X86_ST2, /* scratch */
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UNW_X86_ST3, /* scratch */
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UNW_X86_ST4, /* scratch */
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UNW_X86_ST5, /* scratch */
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UNW_X86_ST6, /* scratch */
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UNW_X86_ST7, /* scratch */
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UNW_X86_FCW, /* scratch */
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UNW_X86_FSW, /* scratch */
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UNW_X86_FTW, /* scratch */
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UNW_X86_FOP, /* scratch */
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UNW_X86_FCS, /* scratch */
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UNW_X86_FIP, /* scratch */
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UNW_X86_FEA, /* scratch */
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UNW_X86_FDS, /* scratch */
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/* SSE registers */
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UNW_X86_XMM0_lo, /* scratch */
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UNW_X86_XMM0_hi, /* scratch */
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UNW_X86_XMM1_lo, /* scratch */
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UNW_X86_XMM1_hi, /* scratch */
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UNW_X86_XMM2_lo, /* scratch */
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UNW_X86_XMM2_hi, /* scratch */
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UNW_X86_XMM3_lo, /* scratch */
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UNW_X86_XMM3_hi, /* scratch */
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UNW_X86_XMM4_lo, /* scratch */
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UNW_X86_XMM4_hi, /* scratch */
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UNW_X86_XMM5_lo, /* scratch */
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UNW_X86_XMM5_hi, /* scratch */
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UNW_X86_XMM6_lo, /* scratch */
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UNW_X86_XMM6_hi, /* scratch */
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UNW_X86_XMM7_lo, /* scratch */
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UNW_X86_XMM7_hi, /* scratch */
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UNW_X86_MXCSR, /* scratch */
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/* segment registers */
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UNW_X86_GS, /* special */
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UNW_X86_FS, /* special */
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UNW_X86_ES, /* special */
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UNW_X86_DS, /* special */
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UNW_X86_SS, /* special */
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UNW_X86_CS, /* special */
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UNW_X86_TSS, /* special */
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UNW_X86_LDT, /* special */
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/* frame info (read-only) */
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UNW_X86_CFA,
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UNW_X86_XMM0, /* scratch */
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UNW_X86_XMM1, /* scratch */
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UNW_X86_XMM2, /* scratch */
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UNW_X86_XMM3, /* scratch */
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UNW_X86_XMM4, /* scratch */
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UNW_X86_XMM5, /* scratch */
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UNW_X86_XMM6, /* scratch */
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UNW_X86_XMM7, /* scratch */
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UNW_TDEP_LAST_REG = UNW_X86_XMM7,
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UNW_TDEP_IP = UNW_X86_EIP,
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UNW_TDEP_SP = UNW_X86_ESP,
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UNW_TDEP_EH = UNW_X86_EAX
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}
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x86_regnum_t;
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#define UNW_TDEP_NUM_EH_REGS 2 /* eax and edx are exception args */
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typedef struct unw_tdep_save_loc
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{
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/* Additional target-dependent info on a save location. */
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}
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unw_tdep_save_loc_t;
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/* On x86, we can directly use ucontext_t as the unwind context. */
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typedef ucontext_t unw_tdep_context_t;
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#include "libunwind-dynamic.h"
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typedef struct
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{
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/* no x86-specific auxiliary proc-info */
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}
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unw_tdep_proc_info_t;
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#include "libunwind-common.h"
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#define unw_tdep_getcontext UNW_ARCH_OBJ(getcontext)
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extern int unw_tdep_getcontext (unw_tdep_context_t *);
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#define unw_tdep_is_fpreg UNW_ARCH_OBJ(is_fpreg)
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extern int unw_tdep_is_fpreg (int);
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#if defined(__cplusplus) || defined(c_plusplus)
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}
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#endif
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#endif /* LIBUNWIND_H */
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