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Date: Tue, 3 Jan 2023 15:21:02 +0000
From: Pedro Falcato <pedro.falcato@...il.com>
To: musl@...ts.openwall.com
Cc: Pedro Falcato <pedro.falcato@...il.com>
Subject: [PATCH] riscv64: Add vfork
Implement vfork() using clone(CLONE_VM | CLONE_VFORK | ...).
---
src/process/riscv64/vfork.s | 11 +++++++++++
1 file changed, 11 insertions(+)
create mode 100644 src/process/riscv64/vfork.s
diff --git a/src/process/riscv64/vfork.s b/src/process/riscv64/vfork.s
new file mode 100644
index 00000000..2f90329d
--- /dev/null
+++ b/src/process/riscv64/vfork.s
@@ -0,0 +1,11 @@
+.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
+ j __syscall_ret
--
2.39.0
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