diff options
Diffstat (limited to 'sysdeps/x86_64/_mcount.S')
| -rw-r--r-- | sysdeps/x86_64/_mcount.S | 65 |
1 files changed, 43 insertions, 22 deletions
diff --git a/sysdeps/x86_64/_mcount.S b/sysdeps/x86_64/_mcount.S index 5d7edd2a29..a2f4068b61 100644 --- a/sysdeps/x86_64/_mcount.S +++ b/sysdeps/x86_64/_mcount.S @@ -1,5 +1,5 @@ /* Machine-specific calling sequence for `mcount' profiling function. x86-64 version. - Copyright (C) 2002-2016 Free Software Foundation, Inc. + Copyright (C) 2002-2018 Free Software Foundation, Inc. Contributed by Andreas Jaeger <aj@suse.de>. This file is part of the GNU C Library. @@ -24,81 +24,102 @@ #include <sysdep.h> - .globl C_SYMBOL_NAME(_mcount) - .type C_SYMBOL_NAME(_mcount), @function - .align ALIGNARG(4) -C_LABEL(_mcount) +ENTRY(_mcount) /* Allocate space for 7 registers. */ subq $56,%rsp + cfi_adjust_cfa_offset (56) movq %rax,(%rsp) + cfi_rel_offset (rax, 0) movq %rcx,8(%rsp) + cfi_rel_offset (rcx, 8) movq %rdx,16(%rsp) + cfi_rel_offset (rdx, 16) movq %rsi,24(%rsp) + cfi_rel_offset (rsi, 24) movq %rdi,32(%rsp) + cfi_rel_offset (rdi, 32) movq %r8,40(%rsp) + cfi_rel_offset (r8, 40) movq %r9,48(%rsp) + cfi_rel_offset (r9, 48) /* Setup parameter for __mcount_internal. */ /* selfpc is the return address on the stack. */ movq 56(%rsp),%rsi /* Get frompc via the frame pointer. */ movq 8(%rbp),%rdi -#ifdef PIC - call C_SYMBOL_NAME(__mcount_internal)@PLT -#else call C_SYMBOL_NAME(__mcount_internal) -#endif /* Pop the saved registers. Please note that `mcount' has no return value. */ movq 48(%rsp),%r9 + cfi_restore (r9) movq 40(%rsp),%r8 + cfi_restore (r8) movq 32(%rsp),%rdi + cfi_restore (rdi) movq 24(%rsp),%rsi + cfi_restore (rsi) movq 16(%rsp),%rdx + cfi_restore (rdx) movq 8(%rsp),%rcx + cfi_restore (rcx) movq (%rsp),%rax + cfi_restore (rax) addq $56,%rsp + cfi_adjust_cfa_offset (-56) ret - - ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(_mcount)) +END(_mcount) #undef mcount weak_alias (_mcount, mcount) - .globl C_SYMBOL_NAME(__fentry__) - .type C_SYMBOL_NAME(__fentry__), @function - .align ALIGNARG(4) -C_LABEL(__fentry__) - /* Allocate space for 7 registers. */ +/* __fentry__ is different from _mcount in that it is called before + function prolog. This means (among other things) that it has non-standard + stack alignment on entry: (%RSP & 0xF) == 0. */ + +ENTRY(__fentry__) + /* Allocate space for 7 registers + (+8 bytes for proper stack alignment). */ subq $64,%rsp + cfi_adjust_cfa_offset (64) movq %rax,(%rsp) + cfi_rel_offset (rax, 0) movq %rcx,8(%rsp) + cfi_rel_offset (rcx, 8) movq %rdx,16(%rsp) + cfi_rel_offset (rdx, 16) movq %rsi,24(%rsp) + cfi_rel_offset (rsi, 24) movq %rdi,32(%rsp) + cfi_rel_offset (rdi, 32) movq %r8,40(%rsp) + cfi_rel_offset (r8, 40) movq %r9,48(%rsp) + cfi_rel_offset (r9, 48) /* Setup parameter for __mcount_internal. */ /* selfpc is the return address on the stack. */ movq 64(%rsp),%rsi /* caller is the return address above it */ movq 72(%rsp),%rdi -#ifdef PIC - call C_SYMBOL_NAME(__mcount_internal)@PLT -#else call C_SYMBOL_NAME(__mcount_internal) -#endif /* Pop the saved registers. Please note that `__fentry__' has no return value. */ movq 48(%rsp),%r9 + cfi_restore (r9) movq 40(%rsp),%r8 + cfi_restore (r8) movq 32(%rsp),%rdi + cfi_restore (rdi) movq 24(%rsp),%rsi + cfi_restore (rsi) movq 16(%rsp),%rdx + cfi_restore (rdx) movq 8(%rsp),%rcx + cfi_restore (rcx) movq (%rsp),%rax + cfi_restore (rax) addq $64,%rsp + cfi_adjust_cfa_offset (-64) ret - - ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(__fentry__)) +END(__fentry__) |