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aarch64: add vfork

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The generic vfork implementation uses clone(SIGCHLD) which has fork
semantics.

Implement vfork as clone(SIGCHLD|CLONE_VM|CLONE_VFORK, 0) instead which
has vfork semantics. (stack == 0 means sp is unchanged in the child.)

Some users rely on vfork semantics when memory overcommit is disabled
or when the vfork child runs code that synchronizes with the parent
process (non-conforming).
This commit is contained in:
Szabolcs Nagy 2022-07-16 15:55:51 +02:00 • committed by Rich Felker
parent 7d568410b4
commit 4f48da008d
1 changed files with 9 additions and 0 deletions
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9
src/process/aarch64/vfork.s Normal file
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.global vfork
.type vfork,%function
vfork:
mov x8, 220 // SYS_clone
mov x0, 0x4111 // SIGCHLD | CLONE_VM | CLONE_VFORK
mov x1, 0
svc 0
.hidden __syscall_ret
b __syscall_ret