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riscv64: add vfork

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Implement vfork() using clone(CLONE_VM | CLONE_VFORK | ...).
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Pedro Falcato 2023-02-09 16:34:12 +00:00 • committed by Rich Felker
parent 269d193820
commit 5763f003a5
1 changed files with 12 additions and 0 deletions
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12
src/process/riscv64/vfork.s Normal file
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.global vfork
.type vfork,@function
vfork:
/* riscv does not have SYS_vfork, so we must use clone instead */
/* note: riscv's clone = clone(flags, sp, ptidptr, tls, ctidptr) */
li a7, 220
li a0, 0x100 | 0x4000 | 17 /* flags = CLONE_VM | CLONE_VFORK | SIGCHLD */
mv a1, sp
/* the other arguments are ignoreable */
ecall
.hidden __syscall_ret
j __syscall_ret