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authorRich Felker <dalias@aerifal.cx>2016-02-04 23:01:03 +0000
committerRich Felker <dalias@aerifal.cx>2016-02-04 23:01:03 +0000
commit756c8af8589265e99e454fe3adcda1d0bc5e1963 (patch)
tree8de0abc5bc1ed79f72f4da99b795cd0333416e31 /src/thread/vmlock.c
parentaecda35373511c5bf02c0f708bd262adb1a09287 (diff)
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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/thread/vmlock.c')
0 files changed, 0 insertions, 0 deletions