diff options
Diffstat (limited to 'coroutine/arm64/Context.h')
| -rw-r--r-- | coroutine/arm64/Context.h | 43 |
1 files changed, 39 insertions, 4 deletions
diff --git a/coroutine/arm64/Context.h b/coroutine/arm64/Context.h index 1472621f48..468e4155b2 100644 --- a/coroutine/arm64/Context.h +++ b/coroutine/arm64/Context.h @@ -15,9 +15,21 @@ #include <stdint.h> #include <string.h> +#if defined __GNUC__ #define COROUTINE __attribute__((noreturn)) void +#define COROUTINE_DECL COROUTINE +#elif defined _MSC_VER +#define COROUTINE __declspec(noreturn) void +#define COROUTINE_DECL void +#endif + +#if defined(_WIN32) +#define TEB_OFFSET 0x20 +#else +#define TEB_OFFSET 0x00 +#endif -enum {COROUTINE_REGISTERS = 0xb0 / 8}; +enum {COROUTINE_REGISTERS = (0xa0 + TEB_OFFSET) / 8}; #if defined(__SANITIZE_ADDRESS__) #define COROUTINE_SANITIZE_ADDRESS @@ -44,12 +56,26 @@ struct coroutine_context #endif }; -typedef COROUTINE(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self); +typedef COROUTINE_DECL(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self); static inline void coroutine_initialize_main(struct coroutine_context * context) { context->stack_pointer = NULL; } +static inline void *ptrauth_sign_instruction_addr(void *addr, void *modifier) { +#if defined(__ARM_FEATURE_PAC_DEFAULT) && __ARM_FEATURE_PAC_DEFAULT != 0 + // Sign the given instruction address with the given modifier and key A + register void *r17 __asm("r17") = addr; + register void *r16 __asm("r16") = modifier; + // Use HINT mnemonic instead of PACIA1716 for compatibility with older assemblers. + __asm ("hint #8;" : "+r"(r17) : "r"(r16)); + addr = r17; +#else + // No-op if PAC is not enabled +#endif + return addr; +} + static inline void coroutine_initialize( struct coroutine_context *context, coroutine_start start, @@ -66,12 +92,21 @@ static inline void coroutine_initialize( // Stack grows down. Force 16-byte alignment. char * top = (char*)stack + size; - context->stack_pointer = (void**)((uintptr_t)top & ~0xF); + top = (char *)((uintptr_t)top & ~0xF); + context->stack_pointer = (void**)top; context->stack_pointer -= COROUTINE_REGISTERS; memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS); - context->stack_pointer[0xa0 / 8] = (void*)start; + void *addr = (void*)(uintptr_t)start; + context->stack_pointer[(0x98 + TEB_OFFSET) / 8] = ptrauth_sign_instruction_addr(addr, (void*)top); +#if defined(_WIN32) + // save top address of stack as base in TEB + context->stack_pointer[0x00 / 8] = (char*)stack + size; + // save botton address of stack as limit and deallocation stack in TEB + context->stack_pointer[0x08 / 8] = stack; + context->stack_pointer[0x10 / 8] = stack; +#endif } struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target); |