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Merge pull request #7237 from koachan/sparc64-longdouble_fork

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Add "long double" mapping and implement fork() on Linux/sparc64
This commit is contained in:
Andrew Kelley
2020-11-29 10:33:43 -08:00
committed by GitHub
parent 89ee4b8621 f10bff9ffb
commit e701ac1a51
3 changed files with 29 additions and 1 deletions
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4
lib/std/os/linux.zig
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@@ -112,7 +112,9 @@ pub fn execve(path: [*:0]const u8, argv: [*:null]const ?[*:0]const u8, envp: [*:
}
pub fn fork() usize {
if (@hasField(SYS, "fork")) {
if (comptime builtin.arch.isSPARC()) {
return syscall_fork();
} else if (@hasField(SYS, "fork")) {
return syscall0(.fork);
} else {
return syscall2(.clone, SIGCHLD, 0);

23
lib/std/os/linux/sparc64.zig
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@@ -21,6 +21,29 @@ pub fn syscall_pipe(fd: *[2]i32) usize {
);
}
pub fn syscall_fork() usize {
// Linux/sparc64 fork() returns two values in %o0 and %o1:
// - On the parent's side, %o0 is the child's PID and %o1 is 0.
// - On the child's side, %o0 is the parent's PID and %o1 is 1.
// We need to clear the child's %o0 so that the return values
// conform to the libc convention.
return asm volatile (
\\ t 0x6d
\\ bcc,pt %%xcc, 1f
\\ nop
\\ ba 2f
\\ neg %%o0
\\ 1:
\\ # Clear the child's %%o0
\\ dec %%o1
\\ and %%o1, %%o0, %%o0
\\ 2:
: [ret] "={o0}" (-> usize)
: [number] "{g1}" (@enumToInt(SYS.fork))
: "memory", "xcc", "o1", "o2", "o3", "o4", "o5", "o7"
);
}
pub fn syscall0(number: SYS) usize {
return asm volatile (
\\ t 0x6d

3
src/stage1/codegen.cpp
View File

@@ -8640,6 +8640,9 @@ static void define_builtin_types(CodeGen *g) {
case ZigLLVM_ppc64le:
add_fp_entry(g, "c_longdouble", 128, LLVMFP128Type(), &g->builtin_types.entry_c_longdouble);
break;
case ZigLLVM_sparcv9:
add_fp_entry(g, "c_longdouble", 128, LLVMFP128Type(), &g->builtin_types.entry_c_longdouble);
break;
case ZigLLVM_avr:
// It's either a float or a double, depending on a toolchain switch
add_fp_entry(g, "c_longdouble", 64, LLVMDoubleType(), &g->builtin_types.entry_c_longdouble);