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| author | Rich Felker <dalias@aerifal.cx> | 2016-02-04 23:01:03 +0000 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2016-02-04 23:01:03 +0000 |
| commit | 756c8af8589265e99e454fe3adcda1d0bc5e1963 (patch) | |
| tree | 8de0abc5bc1ed79f72f4da99b795cd0333416e31 /arch/mips | |
| parent | aecda35373511c5bf02c0f708bd262adb1a09287 (diff) | |
| download | musl-756c8af8589265e99e454fe3adcda1d0bc5e1963.tar.gz | |
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 'arch/mips')
0 files changed, 0 insertions, 0 deletions