Re: [Tinycc-devel] execve being called with wrong path

[Ekaitz Zarraga]

Hi,

I think what you see in the strace is because you didn't call the 
program properly. Use this instead:

        strace ./a.out

Once you have that, please let us know.

Best,
Ekaitz

On 2024-10-07 19:10, Brian Mayer wrote:
> Hi, I'm using the latest commit up to now, I created a simple hello
> world example, compiled it and ran it, however it seg faulted. Output
> below:
>
> # ./a.out
> Segmentation fault (core dumped)
>
>
> Using strace I was able to id the problem:
>
> # strace a.out
>
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> execve("/bin/a.out", 0x5dfabbb57420, 0x7ffe3d340c30) = -1 ENOENT (No
> such file or directory)
> SYS_20(0x2, 0x7ffe3d3406c0, 0x2, 0x7f1eb10458c0, 0x7fffffff, NULLstrace: ) = 8
> SYS_20(0x2, 0x7ffe3d3407a0, 0x2, 0x7f1eb10458c0, 0x7fffffff, NULLexec
> a.out) = 10
> SYS_20(0x2, 0x7ffe3d3406c0, 0x2, 0x7f1eb10458c0, 0x7fffffff, NULL: No
> such file or directory) = 27
> SYS_20(0x2, 0x7ffe3d340930, 0x2, 0x7f1eb10458c0, 0x7fffffff, NULL
> ) = 1
> exit_group(127+++ stopped with 19 +++
>
> The execve call is using the wrong path! Since a.out is not in /bin.
>
> Calling ld to run a.out gives the correct result:
>
> # strace ld ./a.out
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> execve("/bin/ld", 0x65330c419420, 0x7ffd5df5de38) = 0
> [stopped 1407 (5)]
> arch_prctl(4098, 0x7d3d66b32b68) = 0
> set_tid_address(0x7d3d66b32fd0) = 34645
> open("./a.out", 32768, O_RDONLY, 0) = 3
> read(3, "\x7fELF\x02\x01\x01", 960) = 960
> mmap(0x400000, 6295552, PROT_READ, MAP_PRIVATE, 3, 0) = 0x400000
> mmap(0x600000, 4096, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0)
> = 0x600000
> mmap(0x800000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3,
> 0) = 0x800000
> mmap(0xa00000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3,
> 0) = 0xa00000
> close(3) = 0
> brk(NULL) = 0x555569277000
> brk(0x555569279000) = 0x555569279000
> mmap(0x555569277000, 4096, PROT_NONE,
> MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, -1, 0) = 0x555569277000
> mprotect(0x7d3d66b2f000, 4096, PROT_READ) = 0
> ioctl(1, TIOCGWINSZ, {ws_row=83, ws_col=171, ws_xpixel=1372,
> ws_ypixel=1415}) = 0
> SYS_20(0x1, 0x7ffcf7278f70, 0x2, 0x10, 0x7d3d66b302c0, 0x800518hello from lin0
> ) = 16
> exit_group(16+++ stopped with 19 +++
>
> I'm not sure if this is a compiler issue. I'm using musl 1.2.5 on
> x86_64,
> my tcc -vv output is:
>
> tcc version 0.9.28rc 2024-10-05 mob@6ddc45c0 (x86_64 Linux)
> install: //lib/tcc
> include:
>    /include
> libraries:
>    /lib
> libtcc1:
>    /lib/libtcc1.a
> crt:
>    /lib
> elfinterp:
>    /lib/libc.so
>
>
> Can I have some help please?
> Thanks!
>
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