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57256971b0
This change implements vfork.S for direct support of the vfork syscall. clone.S is revised to correct child support for the vfork case. The main bug was creating a frame prior to the clone syscall. This was done to allow the rp and r4 registers to be saved and restored from the stack frame. r4 was used to save and restore the PIC register, r19, across the system call and the call to set errno. But in the vfork case, it is undefined behavior for the child to return from the function in which vfork was called. It is surprising that this usually worked. Syscalls on hppa save and restore rp and r19, so we don't need to create a frame prior to the clone syscall. We only need a frame when __syscall_error is called. We also don't need to save and restore r19 around the call to $$dyncall as r19 is not used in the code after $$dyncall. This considerably simplifies clone.S. Signed-off-by: John David Anglin <dave.anglin@bell.net> |
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| aarch64 | ||
| alpha | ||
| arc | ||
| arm | ||
| csky | ||
| generic | ||
| gnu | ||
| hppa | ||
| htl | ||
| hurd | ||
| i386 | ||
| ieee754 | ||
| loongarch | ||
| m68k | ||
| mach | ||
| microblaze | ||
| mips | ||
| nptl | ||
| or1k | ||
| posix | ||
| powerpc | ||
| pthread | ||
| riscv | ||
| s390 | ||
| sh | ||
| sparc | ||
| unix | ||
| wordsize-32 | ||
| wordsize-64 | ||
| x86 | ||
| x86_64 | ||