mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
efbe665c3a
When glibc is built with --enable-profile, the ENTRY of asm functions includes CALL_MCOUNT for profiling. (matters for binaries static linked against libc_p.a.) CALL_MCOUNT did not save/restore argument registers around the _mcount call so it clobbered them. (it is enough to only save/restore the arguments passed to a given asm function, but that would be too many asm changes so it is simpler to always save all argument registers in this macro.) float args are not saved: mcount does not clobber the float regs and currently no asm function takes float arguments anyway. [BZ #18707] * sysdeps/aarch64/Makefile (CFLAGS-mcount.c): Add -mgeneral-regs-only. * sysdeps/aarch64/sysdep.h (CALL_MCOUNT): Save argument registers.
128 lines
3.8 KiB
C
128 lines
3.8 KiB
C
/* Copyright (C) 1997-2016 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public License as
|
|
published by the Free Software Foundation; either version 2.1 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdeps/generic/sysdep.h>
|
|
|
|
#ifdef __ASSEMBLER__
|
|
|
|
/* Syntactic details of assembler. */
|
|
|
|
#define ASM_SIZE_DIRECTIVE(name) .size name,.-name
|
|
|
|
/* Define an entry point visible from C. */
|
|
#define ENTRY(name) \
|
|
.globl C_SYMBOL_NAME(name); \
|
|
.type C_SYMBOL_NAME(name),%function; \
|
|
.align 4; \
|
|
C_LABEL(name) \
|
|
cfi_startproc; \
|
|
CALL_MCOUNT
|
|
|
|
/* Define an entry point visible from C. */
|
|
#define ENTRY_ALIGN(name, align) \
|
|
.globl C_SYMBOL_NAME(name); \
|
|
.type C_SYMBOL_NAME(name),%function; \
|
|
.p2align align; \
|
|
C_LABEL(name) \
|
|
cfi_startproc; \
|
|
CALL_MCOUNT
|
|
|
|
/* Define an entry point visible from C with a specified alignment and
|
|
pre-padding with NOPs. This can be used to ensure that a critical
|
|
loop within a function is cache line aligned. Note this version
|
|
does not adjust the padding if CALL_MCOUNT is defined. */
|
|
|
|
#define ENTRY_ALIGN_AND_PAD(name, align, padding) \
|
|
.globl C_SYMBOL_NAME(name); \
|
|
.type C_SYMBOL_NAME(name),%function; \
|
|
.p2align align; \
|
|
.rep padding; \
|
|
nop; \
|
|
.endr; \
|
|
C_LABEL(name) \
|
|
cfi_startproc; \
|
|
CALL_MCOUNT
|
|
|
|
#undef END
|
|
#define END(name) \
|
|
cfi_endproc; \
|
|
ASM_SIZE_DIRECTIVE(name)
|
|
|
|
/* If compiled for profiling, call `mcount' at the start of each function. */
|
|
#ifdef PROF
|
|
# define CALL_MCOUNT \
|
|
str x30, [sp, #-80]!; \
|
|
cfi_adjust_cfa_offset (80); \
|
|
cfi_rel_offset (x30, 0); \
|
|
stp x0, x1, [sp, #16]; \
|
|
cfi_rel_offset (x0, 16); \
|
|
cfi_rel_offset (x1, 24); \
|
|
stp x2, x3, [sp, #32]; \
|
|
cfi_rel_offset (x2, 32); \
|
|
cfi_rel_offset (x3, 40); \
|
|
stp x4, x5, [sp, #48]; \
|
|
cfi_rel_offset (x4, 48); \
|
|
cfi_rel_offset (x5, 56); \
|
|
stp x6, x7, [sp, #64]; \
|
|
cfi_rel_offset (x6, 64); \
|
|
cfi_rel_offset (x7, 72); \
|
|
mov x0, x30; \
|
|
bl mcount; \
|
|
ldp x0, x1, [sp, #16]; \
|
|
cfi_restore (x0); \
|
|
cfi_restore (x1); \
|
|
ldp x2, x3, [sp, #32]; \
|
|
cfi_restore (x2); \
|
|
cfi_restore (x3); \
|
|
ldp x4, x5, [sp, #48]; \
|
|
cfi_restore (x4); \
|
|
cfi_restore (x5); \
|
|
ldp x6, x7, [sp, #64]; \
|
|
cfi_restore (x6); \
|
|
cfi_restore (x7); \
|
|
ldr x30, [sp], #80; \
|
|
cfi_adjust_cfa_offset (-80); \
|
|
cfi_restore (x30);
|
|
#else
|
|
# define CALL_MCOUNT /* Do nothing. */
|
|
#endif
|
|
|
|
/* Local label name for asm code. */
|
|
#ifndef L
|
|
# define L(name) .L##name
|
|
#endif
|
|
|
|
/* Load or store to/from a pc-relative EXPR into/from R, using T. */
|
|
#define LDST_PCREL(OP, R, T, EXPR) \
|
|
adrp T, EXPR; \
|
|
OP R, [T, #:lo12:EXPR];\
|
|
|
|
/* Load or store to/from a got-relative EXPR into/from R, using T. */
|
|
#define LDST_GLOBAL(OP, R, T, EXPR) \
|
|
adrp T, :got:EXPR; \
|
|
ldr T, [T, #:got_lo12:EXPR];\
|
|
OP R, [T];
|
|
|
|
/* Since C identifiers are not normally prefixed with an underscore
|
|
on this system, the asm identifier `syscall_error' intrudes on the
|
|
C name space. Make sure we use an innocuous name. */
|
|
#define syscall_error __syscall_error
|
|
#define mcount _mcount
|
|
|
|
#endif /* __ASSEMBLER__ */
|