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Merge pull request #5010 from Feoramund/fix-netbsd-arm64-syscall

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Fix `syscall_bsd` on NetBSD ARM64
This commit is contained in:
Jeroen van Rijn
2025-04-07 11:30:13 +02:00
committed by GitHub
parent 9a2b6c01aa e13b05168c
commit bee158d53a
1 changed files with 31 additions and 8 deletions
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39
src/llvm_backend_proc.cpp
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@@ -3226,11 +3226,28 @@ gb_internal lbValue lb_build_builtin_proc(lbProcedure *p, Ast *expr, TypeAndValu
{
GB_ASSERT(arg_count <= 7);
char asm_string[] = "svc #0; cset x8, cc";
gbString constraints = gb_string_make(heap_allocator(), "={x0},={x8}");
for (unsigned i = 0; i < arg_count; i++) {
constraints = gb_string_appendc(constraints, ",{");
static char const *regs[] = {
char const *asm_string;
char const **regs;
gbString constraints;
if (build_context.metrics.os == TargetOs_netbsd) {
asm_string = "svc #0; cset x17, cc";
constraints = gb_string_make(heap_allocator(), "={x0},={x17}");
static char const *_regs[] = {
"x17",
"x0",
"x1",
"x2",
"x3",
"x4",
"x5",
};
regs = _regs;
} else {
// FreeBSD (tested), OpenBSD (untested).
asm_string = "svc #0; cset x8, cc";
constraints = gb_string_make(heap_allocator(), "={x0},={x8}");
static char const *_regs[] = {
"x8",
"x0",
"x1",
@@ -3239,13 +3256,19 @@ gb_internal lbValue lb_build_builtin_proc(lbProcedure *p, Ast *expr, TypeAndValu
"x4",
"x5",
};
regs = _regs;
// FreeBSD clobbered x1 on a call to sysctl.
constraints = gb_string_appendc(constraints, ",~{x1}");
}
for (unsigned i = 0; i < arg_count; i++) {
constraints = gb_string_appendc(constraints, ",{");
constraints = gb_string_appendc(constraints, regs[i]);
constraints = gb_string_appendc(constraints, "}");
}
// FreeBSD clobbered x1 on a call to sysctl.
constraints = gb_string_appendc(constraints, ",~{x1},~{cc},~{memory}");
constraints = gb_string_appendc(constraints, ",~{cc},~{memory}");
inline_asm = llvm_get_inline_asm(func_type, make_string_c(asm_string), make_string_c(constraints));
}
break;