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std.os.linux: Fix syscall6() when building for PIC/PIE.

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LLVM would run out of registers due to the edi usage. Just extend what we're
already doing for ebp to edi as well.
This commit is contained in:
Alex Rønne Petersen 2024-08-28 04:57:57 +02:00 • committed by Andrew Kelley
parent e4e91a1314
commit cb0e6d8aa6
1 changed files with 10 additions and 7 deletions
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17
lib/std/os/linux/x86.zig
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@ -85,24 +85,27 @@ pub fn syscall6(
arg5: usize, arg5: usize,
arg6: usize, arg6: usize,
) usize { ) usize {
// The 6th argument is passed via memory as we're out of registers if ebp is // arg5/arg6 are passed via memory as we're out of registers if ebp is used as frame pointer, or
// used as frame pointer. We push arg6 value on the stack before changing // if we're compiling with PIC. We push arg5/arg6 on the stack before changing ebp/esp as the
// ebp or esp as the compiler may reference it as an offset relative to one // compiler may reference arg5/arg6 as an offset relative to ebp/esp.
// of those two registers.
return asm volatile ( return asm volatile (
\\ push %[arg5]
\\ push %[arg6] \\ push %[arg6]
\\ push %%edi
\\ push %%ebp \\ push %%ebp
\\ mov 4(%%esp), %%ebp \\ mov 12(%%esp), %%edi
\\ mov 8(%%esp), %%ebp
\\ int $0x80 \\ int $0x80
\\ pop %%ebp \\ pop %%ebp
\\ add $4, %%esp \\ pop %%edi
\\ add $8, %%esp
: [ret] "={eax}" (-> usize), : [ret] "={eax}" (-> usize),
: [number] "{eax}" (@intFromEnum(number)), : [number] "{eax}" (@intFromEnum(number)),
[arg1] "{ebx}" (arg1), [arg1] "{ebx}" (arg1),
[arg2] "{ecx}" (arg2), [arg2] "{ecx}" (arg2),
[arg3] "{edx}" (arg3), [arg3] "{edx}" (arg3),
[arg4] "{esi}" (arg4), [arg4] "{esi}" (arg4),
[arg5] "{edi}" (arg5), [arg5] "rm" (arg5),
[arg6] "rm" (arg6), [arg6] "rm" (arg6),
: "memory" : "memory"
); );