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py: Implement native load for viper.

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Viper can now do: ptr8(buf)[0], which loads a byte from a buffer using
machine instructions.
This commit is contained in:
Damien George
2014-10-12 16:59:29 +01:00
parent 1ef2348df0
commit 91cfd414c0
11 changed files with 246 additions and 33 deletions
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32
py/asmx86.c
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@@ -50,8 +50,10 @@
#define OPCODE_MOV_I32_TO_R32 (0xb8)
//#define OPCODE_MOV_I32_TO_RM32 (0xc7)
#define OPCODE_MOV_R8_TO_RM8 (0x88) /* /r */
#define OPCODE_MOV_R32_TO_RM32 (0x89)
#define OPCODE_MOV_RM32_TO_R32 (0x8b)
#define OPCODE_MOV_R32_TO_RM32 (0x89) /* /r */
#define OPCODE_MOV_RM32_TO_R32 (0x8b) /* /r */
#define OPCODE_MOVZX_RM8_TO_R32 (0xb6) /* 0x0f 0xb6/r */
#define OPCODE_MOVZX_RM16_TO_R32 (0xb7) /* 0x0f 0xb7/r */
#define OPCODE_LEA_MEM_TO_R32 (0x8d) /* /r */
#define OPCODE_AND_R32_TO_RM32 (0x21) /* /r */
#define OPCODE_OR_R32_TO_RM32 (0x09) /* /r */
@@ -244,22 +246,32 @@ void asm_x86_mov_r32_r32(asm_x86_t *as, int dest_r32, int src_r32) {
asm_x86_generic_r32_r32(as, dest_r32, src_r32, OPCODE_MOV_R32_TO_RM32);
}
void asm_x86_mov_r8_to_disp(asm_x86_t *as, int src_r32, int dest_r32, int dest_disp) {
void asm_x86_mov_r8_to_mem8(asm_x86_t *as, int src_r32, int dest_r32, int dest_disp) {
asm_x86_write_byte_1(as, OPCODE_MOV_R8_TO_RM8);
asm_x86_write_r32_disp(as, src_r32, dest_r32, dest_disp);
}
void asm_x86_mov_r16_to_disp(asm_x86_t *as, int src_r32, int dest_r32, int dest_disp) {
void asm_x86_mov_r16_to_mem16(asm_x86_t *as, int src_r32, int dest_r32, int dest_disp) {
asm_x86_write_byte_2(as, OP_SIZE_PREFIX, OPCODE_MOV_R32_TO_RM32);
asm_x86_write_r32_disp(as, src_r32, dest_r32, dest_disp);
}
void asm_x86_mov_r32_to_disp(asm_x86_t *as, int src_r32, int dest_r32, int dest_disp) {
void asm_x86_mov_r32_to_mem32(asm_x86_t *as, int src_r32, int dest_r32, int dest_disp) {
asm_x86_write_byte_1(as, OPCODE_MOV_R32_TO_RM32);
asm_x86_write_r32_disp(as, src_r32, dest_r32, dest_disp);
}
STATIC void asm_x86_mov_disp_to_r32(asm_x86_t *as, int src_r32, int src_disp, int dest_r32) {
void asm_x86_mov_mem8_to_r32zx(asm_x86_t *as, int src_r32, int src_disp, int dest_r32) {
asm_x86_write_byte_2(as, 0x0f, OPCODE_MOVZX_RM8_TO_R32);
asm_x86_write_r32_disp(as, dest_r32, src_r32, src_disp);
}
void asm_x86_mov_mem16_to_r32zx(asm_x86_t *as, int src_r32, int src_disp, int dest_r32) {
asm_x86_write_byte_2(as, 0x0f, OPCODE_MOVZX_RM16_TO_R32);
asm_x86_write_r32_disp(as, dest_r32, src_r32, src_disp);
}
void asm_x86_mov_mem32_to_r32(asm_x86_t *as, int src_r32, int src_disp, int dest_r32) {
asm_x86_write_byte_1(as, OPCODE_MOV_RM32_TO_R32);
asm_x86_write_r32_disp(as, dest_r32, src_r32, src_disp);
}
@@ -474,12 +486,12 @@ void asm_x86_push_arg(asm_x86_t *as, int src_arg_num) {
#endif
void asm_x86_mov_arg_to_r32(asm_x86_t *as, int src_arg_num, int dest_r32) {
asm_x86_mov_disp_to_r32(as, ASM_X86_REG_EBP, 2 * WORD_SIZE + src_arg_num * WORD_SIZE, dest_r32);
asm_x86_mov_mem32_to_r32(as, ASM_X86_REG_EBP, 2 * WORD_SIZE + src_arg_num * WORD_SIZE, dest_r32);
}
#if 0
void asm_x86_mov_r32_to_arg(asm_x86_t *as, int src_r32, int dest_arg_num) {
asm_x86_mov_r32_to_disp(as, src_r32, ASM_X86_REG_EBP, 2 * WORD_SIZE + dest_arg_num * WORD_SIZE);
asm_x86_mov_r32_to_mem32(as, src_r32, ASM_X86_REG_EBP, 2 * WORD_SIZE + dest_arg_num * WORD_SIZE);
}
#endif
@@ -499,11 +511,11 @@ STATIC int asm_x86_local_offset_from_ebp(asm_x86_t *as, int local_num) {
}
void asm_x86_mov_local_to_r32(asm_x86_t *as, int src_local_num, int dest_r32) {
asm_x86_mov_disp_to_r32(as, ASM_X86_REG_EBP, asm_x86_local_offset_from_ebp(as, src_local_num), dest_r32);
asm_x86_mov_mem32_to_r32(as, ASM_X86_REG_EBP, asm_x86_local_offset_from_ebp(as, src_local_num), dest_r32);
}
void asm_x86_mov_r32_to_local(asm_x86_t *as, int src_r32, int dest_local_num) {
asm_x86_mov_r32_to_disp(as, src_r32, ASM_X86_REG_EBP, asm_x86_local_offset_from_ebp(as, dest_local_num));
asm_x86_mov_r32_to_mem32(as, src_r32, ASM_X86_REG_EBP, asm_x86_local_offset_from_ebp(as, dest_local_num));
}
void asm_x86_mov_local_addr_to_r32(asm_x86_t *as, int local_num, int dest_r32) {