mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-11-28 18:07:37 +01:00
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.
155 lines
4.1 KiB
C
155 lines
4.1 KiB
C
/* libunwind - a platform-independent unwind library
|
|
Copyright (C) 2008 CodeSourcery
|
|
|
|
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. */
|
|
|
|
#ifndef LIBUNWIND_H
|
|
#define LIBUNWIND_H
|
|
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
#include <inttypes.h>
|
|
#include <ucontext.h>
|
|
|
|
#ifdef mips
|
|
# undef mips
|
|
#endif
|
|
|
|
#define UNW_TARGET mips
|
|
#define UNW_TARGET_MIPS 1
|
|
|
|
#define _U_TDEP_QP_TRUE 0 /* see libunwind-dynamic.h */
|
|
|
|
/* This needs to be big enough to accommodate "struct cursor", while
|
|
leaving some slack for future expansion. Changing this value will
|
|
require recompiling all users of this library. Stack allocation is
|
|
relatively cheap and unwind-state copying is relatively rare, so we
|
|
want to err on making it rather too big than too small. */
|
|
|
|
/* FIXME for MIPS. Too big? What do other things use for similar tasks? */
|
|
#define UNW_TDEP_CURSOR_LEN 4096
|
|
|
|
/* The size of a "word" varies on MIPS. This type is used for memory
|
|
addresses and register values. To allow a single library to support
|
|
multiple ABIs, and to support N32 at all, we must use a 64-bit type
|
|
even when addresses are only 32 bits. */
|
|
typedef uint64_t unw_word_t;
|
|
typedef int32_t unw_sword_t;
|
|
|
|
/* FIXME: MIPS ABIs. */
|
|
typedef long double unw_tdep_fpreg_t;
|
|
|
|
typedef enum
|
|
{
|
|
UNW_MIPS_R0,
|
|
UNW_MIPS_R1,
|
|
UNW_MIPS_R2,
|
|
UNW_MIPS_R3,
|
|
UNW_MIPS_R4,
|
|
UNW_MIPS_R5,
|
|
UNW_MIPS_R6,
|
|
UNW_MIPS_R7,
|
|
UNW_MIPS_R8,
|
|
UNW_MIPS_R9,
|
|
UNW_MIPS_R10,
|
|
UNW_MIPS_R11,
|
|
UNW_MIPS_R12,
|
|
UNW_MIPS_R13,
|
|
UNW_MIPS_R14,
|
|
UNW_MIPS_R15,
|
|
UNW_MIPS_R16,
|
|
UNW_MIPS_R17,
|
|
UNW_MIPS_R18,
|
|
UNW_MIPS_R19,
|
|
UNW_MIPS_R20,
|
|
UNW_MIPS_R21,
|
|
UNW_MIPS_R22,
|
|
UNW_MIPS_R23,
|
|
UNW_MIPS_R24,
|
|
UNW_MIPS_R25,
|
|
UNW_MIPS_R26,
|
|
UNW_MIPS_R27,
|
|
UNW_MIPS_R28,
|
|
UNW_MIPS_R29,
|
|
UNW_MIPS_R30,
|
|
UNW_MIPS_R31,
|
|
|
|
/* FIXME: Other registers! */
|
|
|
|
/* For MIPS, the CFA is the value of SP (r29) at the call site in the
|
|
previous frame. */
|
|
UNW_MIPS_CFA,
|
|
|
|
UNW_TDEP_LAST_REG = UNW_MIPS_R31,
|
|
|
|
UNW_TDEP_IP = UNW_MIPS_R31,
|
|
UNW_TDEP_SP = UNW_MIPS_R29,
|
|
UNW_TDEP_EH = UNW_MIPS_R0 /* FIXME. */
|
|
}
|
|
mips_regnum_t;
|
|
|
|
typedef enum
|
|
{
|
|
UNW_MIPS_ABI_O32,
|
|
UNW_MIPS_ABI_N32,
|
|
UNW_MIPS_ABI_N64
|
|
}
|
|
mips_abi_t;
|
|
|
|
#define UNW_TDEP_NUM_EH_REGS 2 /* FIXME for MIPS. */
|
|
|
|
typedef struct unw_tdep_save_loc
|
|
{
|
|
/* Additional target-dependent info on a save location. */
|
|
}
|
|
unw_tdep_save_loc_t;
|
|
|
|
/* On x86, we can directly use ucontext_t as the unwind context. FIXME for
|
|
MIPS. */
|
|
typedef ucontext_t unw_tdep_context_t;
|
|
|
|
#include "libunwind-dynamic.h"
|
|
|
|
typedef struct
|
|
{
|
|
/* no mips-specific auxiliary proc-info */
|
|
}
|
|
unw_tdep_proc_info_t;
|
|
|
|
#include "libunwind-common.h"
|
|
|
|
/* There is no getcontext() on MIPS. Use a stub version which only saves GP
|
|
registers. FIXME: Not ideal, may not be sufficient for all libunwind
|
|
use cases. */
|
|
#define unw_tdep_getcontext UNW_ARCH_OBJ(getcontext)
|
|
extern int unw_tdep_getcontext (ucontext_t *uc);
|
|
|
|
#define unw_tdep_is_fpreg UNW_ARCH_OBJ(is_fpreg)
|
|
extern int unw_tdep_is_fpreg (int);
|
|
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* LIBUNWIND_H */
|