diff options
Diffstat (limited to 'coroutine/ppc64le/Context.h')
-rw-r--r-- | coroutine/ppc64le/Context.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/coroutine/ppc64le/Context.h b/coroutine/ppc64le/Context.h new file mode 100644 index 0000000000..de592f5a46 --- /dev/null +++ b/coroutine/ppc64le/Context.h @@ -0,0 +1,54 @@ +#pragma once + +#include <assert.h> +#include <string.h> + +#if __cplusplus +extern "C" { +#endif + +#define COROUTINE __attribute__((noreturn)) void + +const size_t COROUTINE_REGISTERS = + 19 /* 18 general purpose registers (r14-r31) and 1 return address */ + + 4; /* space for fiber_entry() to store the link register */ + +typedef struct +{ + void **stack_pointer; +} coroutine_context; + +typedef COROUTINE(* coroutine_start)(coroutine_context *from, coroutine_context *self); + +static inline void coroutine_initialize( + coroutine_context *context, + coroutine_start start, + void *stack_pointer, + size_t stack_size +) { + /* Force 16-byte alignment */ + context->stack_pointer = (void**)((uintptr_t)stack_pointer & ~0xF); + + if (!start) { + assert(!context->stack_pointer); + /* We are main coroutine for this thread */ + return; + } + + context->stack_pointer -= COROUTINE_REGISTERS; + memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS); + + /* Skip a global prologue that sets the TOC register */ + context->stack_pointer[18] = ((char*)start) + 8; +} + +coroutine_context * coroutine_transfer(coroutine_context * current, coroutine_context * target); + +static inline void coroutine_destroy(coroutine_context * context) +{ + context->stack_pointer = NULL; +} + +#if __cplusplus +} +#endif |