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From: "tg at mirbsd dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/111165] [13 regression] builtin strchr miscompiles on Debian/x32 with dietlibc
Date: Sat, 26 Aug 2023 20:49:31 +0000 [thread overview]
Message-ID: <bug-111165-4-Y2bg4RNJXo@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-111165-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111165
--- Comment #6 from Thorsten Glaser <tg at mirbsd dot org> ---
dietlibc’s strlen is a horrid SSE nightmare that doesn’t call (f)emms, but it
has a switch global variable __valgrind, if setting that to 1 it uses a very
traditional loop instead, and the registers before/after strlen also match
(only rax has changed), so I’m at a loss.
Changing the line to…
sp += strlen(sp) + 1;
… doesn’t make the problem go away, for some reason. Replacing it with…
while (*sp++) ;
… however *does* make it go away.
I’ll paste a screenlog of single-stepping through the valgrind version of the
code below (http://www.mirbsd.org/cvs.cgi/contrib/hosted/tg/.gdbinit?rev=HEAD
has the helpful t macro):
Breakpoint 1, expand (ccp=<optimized out>, wp=wp@entry=0xffffcdf0, f=f@entry=0)
at eval.c:401
401 asm volatile("nop"); //401
(gdb) t
=> 0x40a63f <expand+1875>: nop
402 sp = cstrchr(sp, '\0') + 1;
rax 0xf7ff790e 4160715022
rbx 0x0 0
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xffffcd5c 4294954332
rbp 0xf7ff790c 4160715020
rsp 0xffffcc90 4294954128
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x40a640 4236864
eflags 0x287 [ CF PF SF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x40a640 <expand+1876>: mov ebx,DWORD PTR [rsp+0x48]
0x40a644 <expand+1880>: mov rdi,rbx
0x40a647 <expand+1883>: call 0x42cc7e <strlen>
(gdb) t
=> 0x40a640 <expand+1876>: mov ebx,DWORD PTR [rsp+0x48]
0x0040a644 402 sp = cstrchr(sp, '\0')
+ 1;
rax 0xf7ff790e 4160715022
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xffffcd5c 4294954332
rbp 0xf7ff790c 4160715020
rsp 0xffffcc90 4294954128
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x40a644 4236868
eflags 0x287 [ CF PF SF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x40a644 <expand+1880>: mov rdi,rbx
0x40a647 <expand+1883>: call 0x42cc7e <strlen>
0x40a64c <expand+1888>: mov ecx,DWORD PTR [rsp+0x48]
(gdb) t
=> 0x40a644 <expand+1880>: mov rdi,rbx
0x0040a647 402 sp = cstrchr(sp, '\0')
+ 1;
rax 0xf7ff790e 4160715022
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc90 4294954128
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x40a647 4236871
eflags 0x287 [ CF PF SF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x40a647 <expand+1883>: call 0x42cc7e <strlen>
0x40a64c <expand+1888>: mov ecx,DWORD PTR [rsp+0x48]
0x40a650 <expand+1892>: lea r12d,[rcx+rax*1+0x1]
(gdb) t
=> 0x40a647 <expand+1883>: call 0x42cc7e <strlen>
0x0042cc7e in strlen ()
rax 0xf7ff790e 4160715022
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42cc7e 4377726
eflags 0x287 [ CF PF SF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42cc7e <strlen>: xor eax,eax
0x42cc80 <strlen+2>: or eax,DWORD PTR [rip+0x74ee] # 0x434174
<__valgrind>
0x42cc86 <strlen+8>: jne 0x42ccca <strlen+76>
(gdb) t
=> 0x42cc7e <strlen>: xor eax,eax
0x0042cc80 in strlen ()
rax 0x0 0
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42cc80 4377728
eflags 0x246 [ PF ZF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42cc80 <strlen+2>: or eax,DWORD PTR [rip+0x74ee] # 0x434174
<__valgrind>
0x42cc86 <strlen+8>: jne 0x42ccca <strlen+76>
0x42cc88 <strlen+10>: mov rax,rdi
(gdb) t
=> 0x42cc80 <strlen+2>: or eax,DWORD PTR [rip+0x74ee] # 0x434174
<__valgrind>
0x0042cc86 in strlen ()
rax 0x1 1
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42cc86 4377734
eflags 0x202 [ IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42cc86 <strlen+8>: jne 0x42ccca <strlen+76>
0x42cc88 <strlen+10>: mov rax,rdi
0x42cc8b <strlen+13>: mov ecx,edi
(gdb) t
=> 0x42cc86 <strlen+8>: jne 0x42ccca <strlen+76>
0x0042ccca in strlen ()
rax 0x1 1
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42ccca 4377802
eflags 0x202 [ IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42ccca <strlen+76>: mov rax,rdi
0x42cccd <strlen+79>: cmp BYTE PTR [rax],0x0
0x42ccd0 <strlen+82>: je 0x42ccd7 <strlen+89>
(gdb) t
=> 0x42ccca <strlen+76>: mov rax,rdi
0x0042cccd in strlen ()
rax 0xf7ff790e 4160715022
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42cccd 4377805
eflags 0x202 [ IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42cccd <strlen+79>: cmp BYTE PTR [rax],0x0
0x42ccd0 <strlen+82>: je 0x42ccd7 <strlen+89>
0x42ccd2 <strlen+84>: inc rax
(gdb) t
=> 0x42cccd <strlen+79>: cmp BYTE PTR [rax],0x0
0x0042ccd0 in strlen ()
rax 0xf7ff790e 4160715022
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42ccd0 4377808
eflags 0x206 [ PF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42ccd0 <strlen+82>: je 0x42ccd7 <strlen+89>
0x42ccd2 <strlen+84>: inc rax
0x42ccd5 <strlen+87>: jmp 0x42cccd <strlen+79>
(gdb) t
=> 0x42ccd0 <strlen+82>: je 0x42ccd7 <strlen+89>
0x0042ccd2 in strlen ()
rax 0xf7ff790e 4160715022
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42ccd2 4377810
eflags 0x206 [ PF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42ccd2 <strlen+84>: inc rax
0x42ccd5 <strlen+87>: jmp 0x42cccd <strlen+79>
0x42ccd7 <strlen+89>: sub rax,rdi
(gdb) t
=> 0x42ccd2 <strlen+84>: inc rax
0x0042ccd5 in strlen ()
rax 0xf7ff790f 4160715023
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42ccd5 4377813
eflags 0x206 [ PF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42ccd5 <strlen+87>: jmp 0x42cccd <strlen+79>
0x42ccd7 <strlen+89>: sub rax,rdi
0x42ccda <strlen+92>: ret
(gdb) t
=> 0x42ccd5 <strlen+87>: jmp 0x42cccd <strlen+79>
0x0042cccd in strlen ()
rax 0xf7ff790f 4160715023
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42cccd 4377805
eflags 0x206 [ PF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42cccd <strlen+79>: cmp BYTE PTR [rax],0x0
0x42ccd0 <strlen+82>: je 0x42ccd7 <strlen+89>
0x42ccd2 <strlen+84>: inc rax
(gdb) t
=> 0x42cccd <strlen+79>: cmp BYTE PTR [rax],0x0
0x0042ccd0 in strlen ()
rax 0xf7ff790f 4160715023
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42ccd0 4377808
eflags 0x206 [ PF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42ccd0 <strlen+82>: je 0x42ccd7 <strlen+89>
0x42ccd2 <strlen+84>: inc rax
0x42ccd5 <strlen+87>: jmp 0x42cccd <strlen+79>
(gdb) t
=> 0x42ccd0 <strlen+82>: je 0x42ccd7 <strlen+89>
0x0042ccd2 in strlen ()
rax 0xf7ff790f 4160715023
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42ccd2 4377810
eflags 0x206 [ PF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42ccd2 <strlen+84>: inc rax
0x42ccd5 <strlen+87>: jmp 0x42cccd <strlen+79>
0x42ccd7 <strlen+89>: sub rax,rdi
(gdb) t
=> 0x42ccd2 <strlen+84>: inc rax
0x0042ccd5 in strlen ()
rax 0xf7ff7910 4160715024
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42ccd5 4377813
eflags 0x212 [ AF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42ccd5 <strlen+87>: jmp 0x42cccd <strlen+79>
0x42ccd7 <strlen+89>: sub rax,rdi
0x42ccda <strlen+92>: ret
(gdb) t
=> 0x42ccd5 <strlen+87>: jmp 0x42cccd <strlen+79>
0x0042cccd in strlen ()
rax 0xf7ff7910 4160715024
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42cccd 4377805
eflags 0x212 [ AF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42cccd <strlen+79>: cmp BYTE PTR [rax],0x0
0x42ccd0 <strlen+82>: je 0x42ccd7 <strlen+89>
0x42ccd2 <strlen+84>: inc rax
(gdb) t
=> 0x42cccd <strlen+79>: cmp BYTE PTR [rax],0x0
0x0042ccd0 in strlen ()
rax 0xf7ff7910 4160715024
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42ccd0 4377808
eflags 0x202 [ IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42ccd0 <strlen+82>: je 0x42ccd7 <strlen+89>
0x42ccd2 <strlen+84>: inc rax
0x42ccd5 <strlen+87>: jmp 0x42cccd <strlen+79>
(gdb) t
=> 0x42ccd0 <strlen+82>: je 0x42ccd7 <strlen+89>
0x0042ccd2 in strlen ()
rax 0xf7ff7910 4160715024
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42ccd2 4377810
eflags 0x202 [ IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42ccd2 <strlen+84>: inc rax
0x42ccd5 <strlen+87>: jmp 0x42cccd <strlen+79>
0x42ccd7 <strlen+89>: sub rax,rdi
(gdb) t
=> 0x42ccd2 <strlen+84>: inc rax
0x0042ccd5 in strlen ()
rax 0xf7ff7911 4160715025
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42ccd5 4377813
eflags 0x206 [ PF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42ccd5 <strlen+87>: jmp 0x42cccd <strlen+79>
0x42ccd7 <strlen+89>: sub rax,rdi
0x42ccda <strlen+92>: ret
(gdb) t
=> 0x42ccd5 <strlen+87>: jmp 0x42cccd <strlen+79>
0x0042cccd in strlen ()
rax 0xf7ff7911 4160715025
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42cccd 4377805
eflags 0x206 [ PF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42cccd <strlen+79>: cmp BYTE PTR [rax],0x0
0x42ccd0 <strlen+82>: je 0x42ccd7 <strlen+89>
0x42ccd2 <strlen+84>: inc rax
(gdb) t
=> 0x42cccd <strlen+79>: cmp BYTE PTR [rax],0x0
0x0042ccd0 in strlen ()
rax 0xf7ff7911 4160715025
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42ccd0 4377808
eflags 0x246 [ PF ZF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42ccd0 <strlen+82>: je 0x42ccd7 <strlen+89>
0x42ccd2 <strlen+84>: inc rax
0x42ccd5 <strlen+87>: jmp 0x42cccd <strlen+79>
(gdb) t
=> 0x42ccd0 <strlen+82>: je 0x42ccd7 <strlen+89>
0x0042ccd7 in strlen ()
rax 0xf7ff7911 4160715025
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42ccd7 4377815
eflags 0x246 [ PF ZF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42ccd7 <strlen+89>: sub rax,rdi
0x42ccda <strlen+92>: ret
0x42ccdb <strncmp>: xor ecx,ecx
(gdb) t
=> 0x42ccd7 <strlen+89>: sub rax,rdi
0x0042ccda in strlen ()
rax 0x3 3
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc88 4294954120
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x42ccda 4377818
eflags 0x216 [ PF AF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x42ccda <strlen+92>: ret
0x42ccdb <strncmp>: xor ecx,ecx
0x42ccdd <strncmp+2>: cmp edx,ecx
(gdb) t
=> 0x42ccda <strlen+92>: ret
0x0040a64c in expand (ccp=<optimized out>, wp=wp@entry=0xffffcdf0, f=f@entry=0)
at eval.c:402
402 sp = cstrchr(sp, '\0') + 1;
rax 0x3 3
rbx 0xf7ff790e 4160715022
rcx 0x0 0
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc90 4294954128
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x40a64c 4236876
eflags 0x216 [ PF AF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x40a64c <expand+1888>: mov ecx,DWORD PTR [rsp+0x48]
0x40a650 <expand+1892>: lea r12d,[rcx+rax*1+0x1]
0x40a655 <expand+1897>: nop
(gdb) t
=> 0x40a64c <expand+1888>: mov ecx,DWORD PTR [rsp+0x48]
0x0040a650 402 sp = cstrchr(sp, '\0')
+ 1;
rax 0x3 3
rbx 0xf7ff790e 4160715022
rcx 0xf7ff790e 4160715022
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc90 4294954128
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0x2 2
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x40a650 4236880
eflags 0x216 [ PF AF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x40a650 <expand+1892>: lea r12d,[rcx+rax*1+0x1]
0x40a655 <expand+1897>: nop
0x40a656 <expand+1898>: movzx ecx,BYTE PTR [ebp+0x2]
(gdb) t
=> 0x40a650 <expand+1892>: lea r12d,[rcx+rax*1+0x1]
405 asm volatile("nop"); //403
rax 0x3 3
rbx 0xf7ff790e 4160715022
rcx 0xf7ff790e 4160715022
rdx 0xffffff81 4294967169
rsi 0x98 152
rdi 0xf7ff790e 4160715022
rbp 0xf7ff790c 4160715020
rsp 0xffffcc90 4294954128
r8 0xa0 160
r9 0x3 3
r10 0x0 0
r11 0x206 518
r12 0xf7ff7912 4160715026
r13 0xffffd1b4 4294955444
r14 0xf7ff510c 4160704780
r15 0x0 0
rip 0x40a655 4236885
eflags 0x216 [ PF AF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x0 0
=> 0x40a655 <expand+1897>: nop
0x40a656 <expand+1898>: movzx ecx,BYTE PTR [ebp+0x2]
0x40a65b <expand+1903>: test ecx,ecx
next prev parent reply other threads:[~2023-08-26 20:49 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-26 18:17 [Bug target/111165] New: " tg at mirbsd dot org
2023-08-26 18:20 ` [Bug target/111165] " pinskia at gcc dot gnu.org
2023-08-26 18:21 ` pinskia at gcc dot gnu.org
2023-08-26 19:36 ` tg at mirbsd dot org
2023-08-26 20:03 ` tg at mirbsd dot org
2023-08-26 20:21 ` tg at mirbsd dot org
2023-08-26 20:49 ` tg at mirbsd dot org [this message]
2023-08-26 21:18 ` tg at mirbsd dot org
2023-08-28 7:25 ` rguenth at gcc dot gnu.org
2023-08-28 14:22 ` tg at mirbsd dot org
2023-08-28 14:41 ` tg at mirbsd dot org
2023-08-28 14:46 ` tg at mirbsd dot org
2023-08-28 14:57 ` tg at mirbsd dot org
2023-08-28 15:02 ` tg at mirbsd dot org
2023-08-28 15:26 ` ubizjak at gmail dot com
2023-08-28 15:44 ` hjl.tools at gmail dot com
2023-08-28 16:08 ` tg at mirbsd dot org
2023-08-28 16:09 ` tg at mirbsd dot org
2023-08-28 16:38 ` tg at mirbsd dot org
2024-05-21 9:16 ` jakub at gcc dot gnu.org
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