diff options
Diffstat (limited to 'libcr/coroutine.c')
| -rw-r--r-- | libcr/coroutine.c | 87 |
1 files changed, 47 insertions, 40 deletions
diff --git a/libcr/coroutine.c b/libcr/coroutine.c index 37a5b1f..568de4e 100644 --- a/libcr/coroutine.c +++ b/libcr/coroutine.c @@ -130,20 +130,48 @@ #if 0 { /* bracket to get Emacs indentation to work how I want */ #endif -#if __arm__ /*======================================================*/ - /* Assume bare metal ARMv6-M. */ - #define CR_PLAT_STACK_GROWS_DOWNWARD 1 - - /* Wrappers for setjmp()/longjmp() that do *not* save the - * interrupt mask. - * - * newlib does not have sigsetjmp()/sigsetlongjmp(), but +/*==================================================================== + * Wrappers for setjmp()/longjmp() that do *not* save the + * interrupt mask. */ +#if __unix__ + /* On a *NIX OS, we use signals as interrupts. POSIX leaves + * it implementation-defined whether setjmp()/longjmp() save + * the signal mask; while glibc does not save it, let's not + * rely on that. */ + #define cr_plat_setjmp(env) sigsetjmp(env, 0) + #define cr_plat_longjmp(env, val) siglongjmp(env, val) +#elif __NEWLIB__ + /* newlib does not have sigsetjmp()/sigsetlongjmp(), but * setjmp()/longjmp() do not save the interrupt mask, * so we * can use them directly. */ #define cr_plat_setjmp(env) setjmp(env) #define cr_plat_longjmp(env, val) longjmp(env, val) +#else + #error unsupported platform (not __unix__, not __NEWLIB__) +#endif + +/*==================================================================== + * Interrupt management routines. */ +#if __unix__ + #include <signal.h> /* for sig*, SIG_* */ + #include <unistd.h> /* for pause() */ + static inline void cr_plat_wait_for_interrupt(void) { + pause(); + } + void _cr_plat_disable_interrupts(void) { + sigset_t all; + sigfillset(&all); + sigprocmask(SIG_BLOCK, &all, NULL); + } + void _cr_plat_enable_interrupts(void) { + sigset_t all; + sigfillset(&all); + sigprocmask(SIG_UNBLOCK, &all, NULL); + } +#elif __arm__ + /* Assume bare-metal if !__unix__. */ static ALWAYS_INLINE void cr_plat_wait_for_interrupt(void) { asm volatile ("wfi":::"memory"); } @@ -153,6 +181,14 @@ void _cr_plat_enable_interrupts(void) { asm volatile ("cpsie i":::"memory"); } +#else + #error unsupported platform (not __unix__, not bare-metal __arm__) +#endif + +/*==================================================================== + * Stack management routines. */ +#if __arm__ + #define CR_PLAT_STACK_GROWS_DOWNWARD 1 #if CONFIG_COROUTINE_MEASURE_STACK static ALWAYS_INLINE uintptr_t cr_plat_get_sp(void) { @@ -183,37 +219,9 @@ : "r0" ); } - -#elif __x86_64__ /*=================================================*/ - /* Assume POSIX. */ - #include <signal.h> /* for sig*, SIG_* */ - #include <unistd.h> /* for pause() */ - +#elif __x86_64__ #define CR_PLAT_STACK_GROWS_DOWNWARD 1 - /* Wrappers for setjmp()/longjmp() that do *not* save the - * interrupt mask. - * - * POSIX leaves it implementation-defined whether they save - * the signal mask; while glibc does not save it, let's not - * rely on that. */ - #define cr_plat_setjmp(env) sigsetjmp(env, 0) - #define cr_plat_longjmp(env, val) siglongjmp(env, val) - - static inline void cr_plat_wait_for_interrupt(void) { - pause(); - } - void _cr_plat_disable_interrupts(void) { - sigset_t all; - sigfillset(&all); - sigprocmask(SIG_BLOCK, &all, NULL); - } - void _cr_plat_enable_interrupts(void) { - sigset_t all; - sigfillset(&all); - sigprocmask(SIG_UNBLOCK, &all, NULL); - } - #if CONFIG_COROUTINE_MEASURE_STACK static ALWAYS_INLINE uintptr_t cr_plat_get_sp(void) { uintptr_t sp; @@ -238,11 +246,10 @@ : "rdi" ); } - #else - #error unsupported platform - + #error unsupported platform (not __arm__, not __x86__) #endif + #if 0 } #endif |