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c: Implement clone() for riscv32-linux.

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Alex Rønne Petersen 2024-06-22 14:52:31 +02:00
parent 8b176ab303
commit b958225e68
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1 changed files with 34 additions and 0 deletions
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lib/c.zig
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@ -319,6 +319,40 @@ fn clone() callconv(.Naked) void {
\\3: bx r5
);
},
.riscv32 => {
// __clone(func, stack, flags, arg, ptid, tls, ctid)
// a0, a1, a2, a3, a4, a5, a6
// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
// a7 a0, a1, a2, a3, a4
asm volatile (
\\ # Save func and arg to stack
\\ addi a1, a1, -8
\\ sw a0, 0(a1)
\\ sw a3, 4(a1)
\\
\\ # Call SYS_clone
\\ mv a0, a2
\\ mv a2, a4
\\ mv a3, a5
\\ mv a4, a6
\\ li a7, 220 # SYS_clone
\\ ecall
\\
\\ beqz a0, 1f
\\ # Parent
\\ ret
\\
\\ # Child
\\1: lw a1, 0(sp)
\\ lw a0, 4(sp)
\\ jalr a1
\\
\\ # Exit
\\ li a7, 93 # SYS_exit
\\ ecall
);
},
.riscv64 => {
// __clone(func, stack, flags, arg, ptid, tls, ctid)
// a0, a1, a2, a3, a4, a5, a6