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Message-Id: <20230209163412.266391-1-pedro.falcato@gmail.com> Date: Thu, 9 Feb 2023 16:34:12 +0000 From: Pedro Falcato <pedro.falcato@...il.com> To: musl@...ts.openwall.com Cc: Pedro Falcato <pedro.falcato@...il.com> Subject: [PATCH v2] riscv64: Add vfork Implement vfork() using clone(CLONE_VM | CLONE_VFORK | ...). --- src/process/riscv64/vfork.s | 12 ++++++++++++ 1 file changed, 12 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..c93dca23 --- /dev/null +++ b/src/process/riscv64/vfork.s @@ -0,0 +1,12 @@ +.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 -- 2.39.1
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