Commit cb0e6d8aa6f258e2ad9b21287c49c34a434750b2 | zig

author	Alex Rønne Petersen <alex@alexrp.com> 2024-08-28 04:57:57+02:00
committer	Andrew Kelley <andrew@ziglang.org> 2024-08-30 14:48:17-07:00
log	cb0e6d8aa6f258e2ad9b21287c49c34a434750b2
tree	67f66081a4177336fc5e1ef2ee224e70f3af1732
parent	e4e91a1314abd78a0f06df718459e42e3c9fb62a

LLVM would run out of registers due to the edi usage. Just extend what we're
already doing for ebp to edi as well.

1 files changed, 10 insertions(+), 7 deletions(-)

lib/std/os/linux/x86.zig+10-7

...	...	@@ -85,24 +85,27 @@ pub fn syscall6(
85	85	arg5: usize,
86	86	arg6: usize,
87	87	) usize {
88		// The 6th argument is passed via memory as we're out of registers if ebp is
89		// used as frame pointer. We push arg6 value on the stack before changing
90		// ebp or esp as the compiler may reference it as an offset relative to one
91		// of those two registers.
	88	// arg5/arg6 are passed via memory as we're out of registers if ebp is used as frame pointer, or
	89	// if we're compiling with PIC. We push arg5/arg6 on the stack before changing ebp/esp as the
	90	// compiler may reference arg5/arg6 as an offset relative to ebp/esp.
92	91	return asm volatile (
	92	\\ push %[arg5]
93	93	\\ push %[arg6]
	94	\\ push %%edi
94	95	\\ push %%ebp
95		\\ mov 4(%%esp), %%ebp
	96	\\ mov 12(%%esp), %%edi
	97	\\ mov 8(%%esp), %%ebp
96	98	\\ int $0x80
97	99	\\ pop %%ebp
98		\\ add $4, %%esp
	100	\\ pop %%edi
	101	\\ add $8, %%esp
99	102	: [ret] "={eax}" (-> usize),
100	103	: [number] "{eax}" (@intFromEnum(number)),
101	104	[arg1] "{ebx}" (arg1),
102	105	[arg2] "{ecx}" (arg2),
103	106	[arg3] "{edx}" (arg3),
104	107	[arg4] "{esi}" (arg4),
105		[arg5] "{edi}" (arg5),
	108	[arg5] "rm" (arg5),
106	109	[arg6] "rm" (arg6),
107	110	: "memory"
108	111	);