4 inline static void* frame_return_address(void *frame_top)
6 return *(void**)frame_top;
9 inline static void set_frame_return_address(void *frame_top, void *return_address)
11 *(void**)frame_top = return_address;
14 #define CALLSTACK_BOTTOM(ctx) (void *)(ctx->callstack_seg->end - sizeof(cell) * 5)
16 inline static void flush_icache(cell start, cell len) {}
18 /* In the instruction sequence:
23 the offset from the immediate operand to MOV to the instruction after
24 the jump is a cell for the immediate operand, 4 bytes for the JMP
25 destination, and one byte for the JMP opcode. */
26 static const fixnum xt_tail_pic_offset = 4 + 1;
28 static const unsigned char call_opcode = 0xe8;
29 static const unsigned char jmp_opcode = 0xe9;
31 inline static unsigned char call_site_opcode(cell return_address)
33 return *(unsigned char *)(return_address - 5);
36 inline static void check_call_site(cell return_address)
38 unsigned char opcode = call_site_opcode(return_address);
39 FACTOR_ASSERT(opcode == call_opcode || opcode == jmp_opcode);
40 (void)opcode; // suppress warning when compiling without assertions
43 inline static void *get_call_target(cell return_address)
45 check_call_site(return_address);
46 return (void *)(*(int *)(return_address - 4) + return_address);
49 inline static void set_call_target(cell return_address, void *target)
51 check_call_site(return_address);
52 *(int *)(return_address - 4) = (u32)((cell)target - return_address);
55 inline static bool tail_call_site_p(cell return_address)
57 switch(call_site_opcode(return_address))
59 case jmp_opcode: return true;
60 case call_opcode: return false;
61 default: abort(); return false;
65 inline static unsigned int fpu_status(unsigned int status)
70 r |= FP_TRAP_INVALID_OPERATION;
72 r |= FP_TRAP_ZERO_DIVIDE;
74 r |= FP_TRAP_OVERFLOW;
76 r |= FP_TRAP_UNDERFLOW;