https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120881
Bug ID: 120881
Summary: [16 Regression] -fstack-protector-all -pg doesn't call
mount at function entry
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gcov-profile
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
[hjl@gnu-zen4-1 gcc]$ cat /tmp/x.c
__attribute__ ((weak)) __attribute__ ((noinline, noclone)) void
f1 (void)
{
}
__attribute__ ((weak)) __attribute__ ((noinline, noclone)) void
f2 (void)
{
f1 ();
asm volatile ("");
}
__attribute__ ((weak)) __attribute__ ((noinline, noclone)) void
f3 (int count)
{
for (int i = 0; i < count; ++i)
{
f1 ();
f2 ();
}
}
int
main (void)
{
f3 (1000);
return 0;
}
[hjl@gnu-zen4-1 gcc]$ ./xgcc -B./ -fstack-protector-all -O2 -pg /tmp/x.c -S
[hjl@gnu-zen4-1 gcc]$ cat x.s
.file "x.c"
.text
.p2align 4
.weak f1
.type f1, @function
f1:
.LFB0:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
subq $16, %rsp
1: call mcount
movq %fs:40, %rax
movq %rax, -8(%rbp)
xorl %eax, %eax
movq -8(%rbp), %rax
subq %fs:40, %rax
jne .L4
leave
.cfi_remember_state
.cfi_def_cfa 7, 8
ret
.L4:
.cfi_restore_state
call __stack_chk_fail
.cfi_endproc
.LFE0:
.size f1, .-f1
.p2align 4
.weak f2
.type f2, @function
f2:
.LFB1:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
subq $16, %rsp
1: call mcount
movq %fs:40, %rax
movq %rax, -8(%rbp)
xorl %eax, %eax
call f1
movq -8(%rbp), %rax
subq %fs:40, %rax
jne .L7
leave
.cfi_remember_state
.cfi_def_cfa 7, 8
ret
.L7:
.cfi_restore_state
call __stack_chk_fail
.cfi_endproc
.LFE1:
.size f2, .-f2
.p2align 4
.weak f3
.type f3, @function
f3:
.LFB2:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
subq $32, %rsp
movq %r12, -8(%rbp)
.cfi_offset 12, -24
movq %fs:40, %r12
movq %r12, -24(%rbp)
movl %edi, %r12d
testl %r12d, %r12d
jle .L8
movq %rbx, -16(%rbp)
.cfi_offset 3, -32
xorl %ebx, %ebx
.p2align 4
.p2align 3
.L10:
call f1
addl $1, %ebx
call f2
cmpl %ebx, %r12d
jne .L10
movq -16(%rbp), %rbx
.cfi_restore 3
.L8:
movq -24(%rbp), %rax
subq %fs:40, %rax
jne .L13
movq -8(%rbp), %r12
leave
.cfi_remember_state
.cfi_def_cfa 7, 8
ret
.L13:
.cfi_restore_state
movq %rbx, -16(%rbp)
.cfi_offset 3, -32
1: call mcount <<<<<<<<<< Isn't at the function entry.
call __stack_chk_fail
.cfi_endproc
.LFE2:
.size f3, .-f3
.section .text.startup,"ax",@progbits
.p2align 4
.globl main
.type main, @function
main:
.LFB3:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
subq $16, %rsp
1: call mcount
movq %fs:40, %rdi
movq %rdi, -8(%rbp)
movl $1000, %edi
call f3
movq -8(%rbp), %rax
subq %fs:40, %rax
jne .L16
leave
.cfi_remember_state
.cfi_def_cfa 7, 8
xorl %eax, %eax
ret
.L16:
.cfi_restore_state
call __stack_chk_fail
.cfi_endproc
.LFE3:
.size main, .-main
.ident "GCC: (GNU) 16.0.0 20250629 (experimental)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-zen4-1 gcc]$
