path: root/arch/mips/pthread_arch.h
diff options
authorRich Felker <>2016-04-03 10:42:37 +0000
committerRich Felker <>2016-04-03 10:42:37 +0000
commit6d99ad91e869aab35a4d76d34c3c9eaf29482bad (patch)
treef8e7665f23b5067b5ca39d2e7a19f7132fc9e2e3 /arch/mips/pthread_arch.h
parentc718f9fc1b4bd913eff10d0c12763f90b2bc487c (diff)
add support for mips and mips64 r6 isa
mips32r6 and mips64r6 are actually new isas at both the asm source and opcode levels (pre-r6 code cannot run on r6) and thus need to be treated as a new subarch. the following changes are made, some of which yield code generation improvements for non-r6 targets too: - add subarch logic in configure script and reloc.h files for dynamic linker name. - suppress use of .set mips2 asm directives (used to allow mips2 atomic instructions on baseline mips1 builds; the kernel has to emulate them on mips1) except when actually needed. they cause wrong instruction encodings on r6, and pessimize inlining on at least some compilers. - only hard-code sync instruction encoding on mips1. - use "ZC" constraint instead of "m" constraint for llsc memory operands on r6, where the ll/sc instructions no longer accept full 16-bit offsets. - only hard-code rdhwr instruction encoding with .word on targets (pre-r2) where it may need trap-and-emulate by the kernel. otherwise, just use the instruction mnemonic, and allow an arbitrary destination register to be used.
Diffstat (limited to 'arch/mips/pthread_arch.h')
1 files changed, 4 insertions, 5 deletions
diff --git a/arch/mips/pthread_arch.h b/arch/mips/pthread_arch.h
index 8a499654..e5812655 100644
--- a/arch/mips/pthread_arch.h
+++ b/arch/mips/pthread_arch.h
@@ -1,12 +1,11 @@
static inline struct pthread *__pthread_self()
-#ifdef __clang__
- char *tp;
- __asm__ __volatile__ (".word 0x7c03e83b ; move %0, $3" : "=r" (tp) : : "$3" );
+#if __mips_isa_rev < 2
register char *tp __asm__("$3");
- /* rdhwr $3,$29 */
__asm__ __volatile__ (".word 0x7c03e83b" : "=r" (tp) );
+ char *tp;
+ __asm__ __volatile__ ("rdhwr %0, $29" : "=r" (tp) );
return (pthread_t)(tp - 0x7000 - sizeof(struct pthread));