musl/arch/x32/pthread_arch.h

static inline uintptr_t __get_tp()
{
	uintptr_t tp;
	__asm__ ("mov %%fs:0,%0" : "=r" (tp) );
	return tp;
}

#define MC_PC gregs[REG_RIP]

#define CANARY canary2

#define tls_mod_off_t unsigned long long
deduplicate __pthread_self thread pointer adjustment out of each arch the adjustment made is entirely a function of TLS_ABOVE_TP and TP_OFFSET. aside from avoiding repetition of the TP_OFFSET value and arithmetic, this change makes pthread_arch.h independent of the definition of struct __pthread from pthread_impl.h. this in turn will allow inclusion of pthread_arch.h to be moved to the top of pthread_impl.h so that it can influence the definition of the structure. previously, arch files were very inconsistent about the type used for the thread pointer. this change unifies the new __get_tp interface to always use uintptr_t, which is the most correct when performing arithmetic that may involve addresses outside the actual pointed-to object (due to TP_OFFSET). 6 years ago			`static inline uintptr_t __get_tp()`
import vanilla x86_64 code as x32 13 years ago			`{`
deduplicate __pthread_self thread pointer adjustment out of each arch the adjustment made is entirely a function of TLS_ABOVE_TP and TP_OFFSET. aside from avoiding repetition of the TP_OFFSET value and arithmetic, this change makes pthread_arch.h independent of the definition of struct __pthread from pthread_impl.h. this in turn will allow inclusion of pthread_arch.h to be moved to the top of pthread_impl.h so that it can influence the definition of the structure. previously, arch files were very inconsistent about the type used for the thread pointer. this change unifies the new __get_tp interface to always use uintptr_t, which is the most correct when performing arithmetic that may involve addresses outside the actual pointed-to object (due to TP_OFFSET). 6 years ago			`uintptr_t tp;`
			`__asm__ ("mov %%fs:0,%0" : "=r" (tp) );`
			`return tp;`
import vanilla x86_64 code as x32 13 years ago			`}`

properly access mcontext_t program counter in cancellation handler using the actual mcontext_t definition rather than an overlaid pointer array both improves correctness/readability and eliminates some ugly hacks for archs with 64-bit registers bit 32-bit program counter. also fix UB due to comparison of pointers not in a common array object. 11 years ago			`#define MC_PC gregs[REG_RIP]`
fix stack protector crashes on x32 & powerpc due to misplaced TLS canary i386, x86_64, x32, and powerpc all use TLS for stack protector canary values in the default stack protector ABI, but the location only matched the ABI on i386 and x86_64. on x32, the expected location for the canary contained the tid, thus producing spurious mismatches (resulting in process termination) upon fork. on powerpc, the expected location contained the stdio_locks list head, so returning from a function after calling flockfile produced spurious mismatches. in both cases, the random canary was not present, and a predictable value was used instead, making the stack protector hardening much less effective than it should be. in the current fix, the thread structure has been expanded to have canary fields at all three possible locations, and archs that use a non-default location must define a macro in pthread_arch.h to choose which location is used. for most archs (which lack TLS canary ABI) the choice does not matter. 11 years ago
			`#define CANARY canary2`
fix crashes in x32 __tls_get_addr x32 has another gratuitous difference to all other archs: it passes an array of 64bit values to __tls_get_addr(). usually it is an array of size_t. 9 years ago
			`#define tls_mod_off_t unsigned long long`