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https://github.com/RaySollium99/picodrive.git
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c18edb34e6
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@825 be3aeb3a-fb24-0410-a615-afba39da0efa
107 lines
2.1 KiB
C
107 lines
2.1 KiB
C
#include <stdarg.h>
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enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
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#define CONTEXT_REG xBP
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#define EMIT_PTR(ptr, val, type) \
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*(type *)(ptr) = val
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#define EMIT(val, type) { \
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EMIT_PTR(tcache_ptr, val, type); \
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tcache_ptr += sizeof(type); \
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}
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#define EMIT_OP(op) { \
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COUNT_OP; \
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EMIT(op, u8); \
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}
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#define EMIT_MODRM(mod,r,rm) \
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EMIT(((mod)<<6) | ((r)<<3) | (rm), u8)
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#define EMIT_OP_MODRM(op,mod,r,rm) { \
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EMIT_OP(op); \
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EMIT_MODRM(mod, r, rm); \
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}
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#define emith_move_r_r(dst, src) \
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EMIT_OP_MODRM(0x8b, 3, dst, src)
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#define emith_move_r_imm(r, imm) { \
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EMIT_OP(0xb8 + (r)); \
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EMIT(imm, u32); \
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}
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#define emith_add_r_imm(r, imm) { \
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EMIT_OP_MODRM(0x81, 3, 0, r); \
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EMIT(imm, u32); \
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}
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#define emith_sub_r_imm(r, imm) { \
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EMIT_OP_MODRM(0x81, 3, 5, r); \
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EMIT(imm, u32); \
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}
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// XXX: offs is 8bit only
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#define emith_ctx_read(r, offs) { \
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EMIT_OP_MODRM(0x8b, 1, r, xBP); \
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EMIT(offs, u8); /* mov tmp, [ebp+#offs] */ \
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}
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#define emith_ctx_write(r, offs) { \
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EMIT_OP_MODRM(0x89, 1, r, xBP); \
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EMIT(offs, u8); /* mov [ebp+#offs], tmp */ \
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}
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#define emith_jump(ptr) { \
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u32 disp = (u32)ptr - ((u32)tcache_ptr + 5); \
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EMIT_OP(0xe9); \
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EMIT(disp, u32); \
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}
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#define emith_call(ptr) { \
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u32 disp = (u32)ptr - ((u32)tcache_ptr + 5); \
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EMIT_OP(0xe8); \
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EMIT(disp, u32); \
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}
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#define EMITH_CONDITIONAL(code, is_nonzero) { \
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u8 *ptr = tcache_ptr; \
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tcache_ptr = tcache_ptr + 2; \
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code; \
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EMIT_PTR(ptr, ((is_nonzero) ? 0x75 : 0x74), u8); \
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EMIT_PTR(ptr + 1, (tcache_ptr - (ptr + 2)), u8); \
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}
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#define arg2reg(rd, arg) \
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switch (arg) { \
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case 0: rd = xAX; break; \
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case 1: rd = xDX; break; \
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case 2: rd = xCX; break; \
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}
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#define emith_pass_arg_r(arg, reg) { \
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int rd = 7; \
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arg2reg(rd, arg); \
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emith_move_r_r(rd, reg); \
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}
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#define emith_pass_arg_imm(arg, imm) { \
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int rd = 7; \
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arg2reg(rd, arg); \
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emith_move_r_imm(rd, imm); \
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}
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/* SH2 drc specific */
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#define emith_test_t() { \
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if (reg_map_g2h[SHR_SR] == -1) { \
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EMIT_OP_MODRM(0xf6, 1, 0, 5); \
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EMIT(SHR_SR * 4, u8); \
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EMIT(0x01, u8); /* test [ebp+SHR_SR], byte 1 */ \
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} else { \
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EMIT_OP_MODRM(0xf7, 3, 0, reg_map_g2h[SHR_SR]); \
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EMIT(0x01, u16); /* test <reg>, word 1 */ \
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} \
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}
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