musl/arch/mips/pthread_arch.h

static inline struct pthread *__pthread_self()
{
	struct pthread *self;
#ifdef __clang__
	__asm__ __volatile__ (".word 0x7c03e83b ; move %0, $3" : "=r" (self) : : "$3" );
#else
	__asm__ __volatile__ (".word 0x7c03e83b" : "=v" (self) );
#endif
	return self;
}

#define CANCEL_REG_IP (3-(union {int __i; char __b;}){1}.__b)
initial version of mips (o32) port, based on work by Richard Pennington (rdp) basically, this version of the code was obtained by starting with rdp's work from his ellcc source tree, adapting it to musl's build system and coding style, auditing the bits headers for discrepencies with kernel definitions or glibc/LSB ABI or large file issues, fixing up incompatibility with the old binutils from aboriginal linux, and adding some new special cases to deal with the oddities of sigaction and pipe syscall interfaces on mips. at present, minimal test programs work, but some interfaces are broken or missing. threaded programs probably will not link. 2012-07-11 04:22:13 -04:00			`static inline struct pthread *__pthread_self()`
			`{`
			`struct pthread *self;`
add clang-compatible thread-pointer code for mips clang does not presently support the "v" constraint we want to use to get the result from $3, and trying to use register...__asm__("$3") to do the same invokes serious compiler bugs. so for now, i'm working around the issue with an extra temp register and putting $3 in the clobber list instead of using it as output. when the bugs in clang are fixed, this issue should be revisited to generate smaller/faster code like what gcc gets. 2012-09-07 12:18:14 -04:00			`#ifdef __clang__`
			`__asm__ __volatile__ (".word 0x7c03e83b ; move %0, $3" : "=r" (self) : : "$3" );`
			`#else`
initial version of mips (o32) port, based on work by Richard Pennington (rdp) basically, this version of the code was obtained by starting with rdp's work from his ellcc source tree, adapting it to musl's build system and coding style, auditing the bits headers for discrepencies with kernel definitions or glibc/LSB ABI or large file issues, fixing up incompatibility with the old binutils from aboriginal linux, and adding some new special cases to deal with the oddities of sigaction and pipe syscall interfaces on mips. at present, minimal test programs work, but some interfaces are broken or missing. threaded programs probably will not link. 2012-07-11 04:22:13 -04:00			`__asm__ __volatile__ (".word 0x7c03e83b" : "=v" (self) );`
add clang-compatible thread-pointer code for mips clang does not presently support the "v" constraint we want to use to get the result from $3, and trying to use register...__asm__("$3") to do the same invokes serious compiler bugs. so for now, i'm working around the issue with an extra temp register and putting $3 in the clobber list instead of using it as output. when the bugs in clang are fixed, this issue should be revisited to generate smaller/faster code like what gcc gets. 2012-09-07 12:18:14 -04:00			`#endif`
initial version of mips (o32) port, based on work by Richard Pennington (rdp) basically, this version of the code was obtained by starting with rdp's work from his ellcc source tree, adapting it to musl's build system and coding style, auditing the bits headers for discrepencies with kernel definitions or glibc/LSB ABI or large file issues, fixing up incompatibility with the old binutils from aboriginal linux, and adding some new special cases to deal with the oddities of sigaction and pipe syscall interfaces on mips. at present, minimal test programs work, but some interfaces are broken or missing. threaded programs probably will not link. 2012-07-11 04:22:13 -04:00			`return self;`
			`}`

mipsel (little endian) support the fields in the mcontext_t are long long (for no good reason) even on 32-bit mips, so the offset of the instruction pointer (as a word) varies depending on endianness. 2012-07-12 21:49:30 -04:00			`#define CANCEL_REG_IP (3-(union {int __i; char __b;}){1}.__b)`