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Add sign-extended mode for test() instruction

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Maxime Chevalier-Boisvert 2020-12-14 13:26:33 -05:00 • committed by Alan Wu
parent 8ae354e9be
commit 868a6809e7
2 changed files with 24 additions and 11 deletions
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14
ujit_asm.c
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@ -1516,7 +1516,9 @@ void test(codeblock_t* cb, x86opnd_t rm_opnd, x86opnd_t test_opnd)
if (test_opnd.type == OPND_IMM)
{
x86opnd_t imm_opnd = test_opnd;
assert (imm_opnd.as.imm >= 0);
if (imm_opnd.as.imm >= 0)
{
assert (unsig_imm_size(imm_opnd.as.unsig_imm) <= 32);
assert (unsig_imm_size(imm_opnd.as.unsig_imm) <= rm_opnd.num_bits);
@ -1535,6 +1537,16 @@ void test(codeblock_t* cb, x86opnd_t rm_opnd, x86opnd_t test_opnd)
}
}
else
{
// This mode only applies to 64-bit R/M operands with 32-bit signed immediates
assert (imm_opnd.as.imm < 0);
assert (sig_imm_size(imm_opnd.as.imm) <= 32);
assert (rm_opnd.num_bits == 64);
cb_write_rm(cb, false, true, NO_OPND, rm_opnd, 0x00, 1, 0xF7);
cb_write_int(cb, imm_opnd.as.imm, 32);
}
}
else
{
// For now, 32-bit operands only
assert (test_opnd.num_bits == rm_opnd.num_bits);

1
ujit_asm_tests.c
View file

@ -315,6 +315,7 @@ void run_tests()
cb_set_pos(cb, 0); test(cb, mem_opnd(8, RSI, 16), imm_opnd(1)); check_bytes(cb, "F6461001");
cb_set_pos(cb, 0); test(cb, mem_opnd(8, RSI, -16), imm_opnd(1)); check_bytes(cb, "F646F001");
cb_set_pos(cb, 0); test(cb, mem_opnd(32, RSI, 64), EAX); check_bytes(cb, "854640");
cb_set_pos(cb, 0); test(cb, mem_opnd(64, RSI, 64), imm_opnd(~0x08)); check_bytes(cb, "48F74640F7FFFFFF");
// xor
cb_set_pos(cb, 0); xor(cb, EAX, EAX); check_bytes(cb, "31C0");