musl/arch/m68k/pthread_arch.h

static inline uintptr_t __get_tp()
{
	return __syscall(SYS_get_thread_area);
}

#define TLS_ABOVE_TP
#define GAP_ABOVE_TP 0

#define TP_OFFSET 0x7000
#define DTP_OFFSET 0x8000

#define MC_PC gregs[R_PC]
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). 2020-08-25 02:23:08 +00:00			`static inline uintptr_t __get_tp()`
add m68k port three ABIs are supported: the default with 68881 80-bit fpu format and results returned in floating point registers, softfloat-only with the same format, and coldfire fpu with IEEE single/double only. only the first is tested at all, and only under qemu which has fpu emulation bugs. basic functionality smoke tests have been performed for the most common arch-specific breakage via libc-test and qemu user-level emulation. some sysvipc failures remain, but are shared with other big endian archs and will be fixed separately. 2018-06-14 18:26:30 +00:00			`{`
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). 2020-08-25 02:23:08 +00:00			`return __syscall(SYS_get_thread_area);`
add m68k port three ABIs are supported: the default with 68881 80-bit fpu format and results returned in floating point registers, softfloat-only with the same format, and coldfire fpu with IEEE single/double only. only the first is tested at all, and only under qemu which has fpu emulation bugs. basic functionality smoke tests have been performed for the most common arch-specific breakage via libc-test and qemu user-level emulation. some sysvipc failures remain, but are shared with other big endian archs and will be fixed separately. 2018-06-14 18:26:30 +00:00			`}`

			`#define TLS_ABOVE_TP`
			`#define GAP_ABOVE_TP 0`

deduplicate TP_ADJ logic out of each arch, replace with TP_OFFSET the only part of TP_ADJ that was not uniquely determined by TLS_ABOVE_TP was the 0x7000 adjustment used mainly on mips and powerpc variants. 2020-08-25 02:04:52 +00:00			`#define TP_OFFSET 0x7000`
add m68k port three ABIs are supported: the default with 68881 80-bit fpu format and results returned in floating point registers, softfloat-only with the same format, and coldfire fpu with IEEE single/double only. only the first is tested at all, and only under qemu which has fpu emulation bugs. basic functionality smoke tests have been performed for the most common arch-specific breakage via libc-test and qemu user-level emulation. some sysvipc failures remain, but are shared with other big endian archs and will be fixed separately. 2018-06-14 18:26:30 +00:00			`#define DTP_OFFSET 0x8000`

			`#define MC_PC gregs[R_PC]`