Currently, almost all of the shared libraries of MIPS, rely on $t9
to get the address of current function, instead of PCREL instructions,
even on MIPSr6. So we have to set $t9 properly.
To get the address of preemptible function, we need the help of GOT.
MIPS/O32 has .cpload, which can help to generate 3 instructions to get GOT.
For __mips64, we can get GOT by:
lui $t8, %hi(%neg(%gp_rel(SANITIZER_STRINGIFY(TRAMPOLINE(func)))))
daddu $t8, $t8, $t9
daddiu $t8, $t8, %hi(%neg(%gp_rel(SANITIZER_STRINGIFY(TRAMPOLINE(func)))))
And then get the address of __interceptor_func, and jump to it
ld $t9, %got_disp(_interceptor" SANITIZER_STRINGIFY(func) ")($t8)
jr $t9
Upstream-Commit: 0a64367a72f1634321f5051221f05f2f364bd882
libsanitizer
* interception/interception.h (substitution_##func_name):
Use macro C_ASM_TAIL_CALL.
* sanitizer_common/sanitizer_asm.h: Define C_ASM_TAIL_CALL
for MIPS with help of t9.
557dbbac8e