musl - musl - an implementation of the standard library for Linux-based systems

in mips cancellable syscall asm, don't assume gp register is valid

the old __cp_cancel code path loaded the address of __cancel from the GOT using the $gp register, which happened to be set to point to the correct GOT by the calling C function, but there is no ABI requirement that this happen. instead, go the roundabout way and compute the address of __cancel via pc-relative and gp-relative addressing starting with a fake return address generated by a bal instruction, which is the same trick crt1 uses to bootstrap.

Diffstat (limited to 'src')

1 files changed, 13 insertions, 2 deletions