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Merge pull request #1308 from Yawning/fix/amd64-syscalls

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src: Fix the syscall intrinsic code generation for Linux and Windows
This commit is contained in:
gingerBill
2021-11-13 18:54:12 +00:00
committed by GitHub
parent cc316a473e c430a82721
commit bfa23f1352
1 changed files with 16 additions and 1 deletions
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17
src/llvm_backend_proc.cpp
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@@ -2002,7 +2002,22 @@ lbValue lb_build_builtin_proc(lbProcedure *p, Ast *expr, TypeAndValue const &tv,
constraints = gb_string_appendc(constraints, regs[i]);
constraints = gb_string_appendc(constraints, "}");
}
// The SYSCALL instruction stores the address of the
// following instruction into RCX, and RFLAGS in R11.
//
// RSP is not saved, but at least on Linux it appears
// that the kernel system-call handler does the right
// thing.
//
// Some but not all system calls will additionally
// clobber memory.
//
// TODO: FreeBSD is different and will also clobber
// R8, R9, and R10. Additionally CF is used to
// indicate an error instead of -errno.
constraints = gb_string_appendc(constraints, ",~{rcx},~{r11},~{memory}");
inline_asm = llvm_get_inline_asm(func_type, make_string_c(asm_string), make_string_c(constraints));
}
break;