107 lines
5.7 KiB
C
107 lines
5.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/mem/mem.h"
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#include "libc/runtime/gc.h"
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#include "libc/testlib/testlib.h"
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#include "third_party/xed/x86.h"
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#include "tool/build/lib/endian.h"
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#include "tool/build/lib/machine.h"
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#include "tool/build/lib/modrm.h"
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TEST(modrm, testAddressSizeOverride_isNotPresent_keepsWholeExpression) {
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struct Machine *m = gc(NewMachine());
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struct XedDecodedInst *xedd = gc(calloc(1, sizeof(struct XedDecodedInst)));
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uint8_t op[] = {0x8d, 0x04, 0x03}; /* lea (%rbx,%rax,1),%eax */
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m->xedd = xedd;
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Write64(m->bx, 0x2);
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Write64(m->ax, 0xffffffff);
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xed_decoded_inst_zero_set_mode(xedd, XED_MACHINE_MODE_LONG_64);
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ASSERT_EQ(0, xed_instruction_length_decode(xedd, op, sizeof(op)));
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EXPECT_EQ(0x100000001, ComputeAddress(m, m->xedd->op.rde));
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}
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TEST(modrm, testAddressSizeOverride_isPresent_modulesWholeExpression) {
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struct Machine *m = gc(NewMachine());
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struct XedDecodedInst *xedd = gc(calloc(1, sizeof(struct XedDecodedInst)));
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uint8_t op[] = {0x67, 0x8d, 0x04, 0x03}; /* lea (%ebx,%eax,1),%eax */
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m->xedd = xedd;
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Write64(m->bx, 0x2);
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Write64(m->ax, 0xffffffff);
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xed_decoded_inst_zero_set_mode(xedd, XED_MACHINE_MODE_LONG_64);
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ASSERT_EQ(0, xed_instruction_length_decode(xedd, op, sizeof(op)));
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EXPECT_EQ(0x000000001, ComputeAddress(m, m->xedd->op.rde));
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}
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TEST(modrm, testOverflow_doesntTriggerTooling) {
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struct Machine *m = gc(NewMachine());
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struct XedDecodedInst *xedd = gc(calloc(1, sizeof(struct XedDecodedInst)));
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uint8_t op[] = {0x8d, 0x04, 0x03}; /* lea (%rbx,%rax,1),%eax */
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m->xedd = xedd;
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Write64(m->bx, 0x0000000000000001);
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Write64(m->ax, 0x7fffffffffffffff);
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xed_decoded_inst_zero_set_mode(xedd, XED_MACHINE_MODE_LONG_64);
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ASSERT_EQ(0, xed_instruction_length_decode(xedd, op, sizeof(op)));
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EXPECT_EQ(0x8000000000000000ull,
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(uint64_t)ComputeAddress(m, m->xedd->op.rde));
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}
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TEST(modrm, testPuttingOnTheRiz) {
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struct Machine *m = gc(NewMachine());
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static uint8_t ops[][15] = {
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{0x8d, 0b00110100, 0b00100110}, // lea (%rsi),%esi
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{0x67, 0x8d, 0b00110100, 0b11100110}, // lea (%esi,%eiz,8),%esi
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{103, 141, 180, 229, 55, 19, 3, 0}, // lea 0x31337(%ebp,%eiz,8),%esi
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{141, 52, 229, 55, 19, 3, 0}, // lea 0x31337,%esi
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};
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m->xedd = gc(calloc(1, sizeof(struct XedDecodedInst)));
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Write64(m->si, 0x100000001);
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Write64(m->bp, 0x200000002);
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xed_decoded_inst_zero_set_mode(m->xedd, XED_MACHINE_MODE_LONG_64);
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ASSERT_EQ(0, xed_instruction_length_decode(m->xedd, ops[0], sizeof(ops[0])));
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EXPECT_EQ(0x100000001, ComputeAddress(m, m->xedd->op.rde));
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xed_decoded_inst_zero_set_mode(m->xedd, XED_MACHINE_MODE_LONG_64);
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ASSERT_EQ(0, xed_instruction_length_decode(m->xedd, ops[1], sizeof(ops[1])));
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EXPECT_EQ(0x000000001, ComputeAddress(m, m->xedd->op.rde));
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xed_decoded_inst_zero_set_mode(m->xedd, XED_MACHINE_MODE_LONG_64);
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ASSERT_EQ(0, xed_instruction_length_decode(m->xedd, ops[2], sizeof(ops[2])));
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EXPECT_EQ(0x31339, ComputeAddress(m, m->xedd->op.rde));
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xed_decoded_inst_zero_set_mode(m->xedd, XED_MACHINE_MODE_LONG_64);
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ASSERT_EQ(0, xed_instruction_length_decode(m->xedd, ops[3], sizeof(ops[3])));
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EXPECT_EQ(0x31337, ComputeAddress(m, m->xedd->op.rde));
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}
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TEST(modrm, testSibIndexOnly) {
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// mod = 0b00 (0)
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// reg = 0b000 (0)
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// rm = 0b100 (4)
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// scale = 0b10 (2)
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// index = 0b001 (1)
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// base = 0b101 (5)
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struct Machine *m = gc(NewMachine());
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struct XedDecodedInst *xedd = gc(calloc(1, sizeof(struct XedDecodedInst)));
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uint8_t op[] = {76, 141, 4, 141, 0, 0, 0, 0}; /* lea 0x0(,%rcx,4),%r8 */
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m->xedd = xedd;
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Write64(m->bp, 0x123);
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Write64(m->cx, 0x123);
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xed_decoded_inst_zero_set_mode(xedd, XED_MACHINE_MODE_LONG_64);
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ASSERT_EQ(0, xed_instruction_length_decode(xedd, op, sizeof(op)));
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EXPECT_EQ(0x123 * 4, (uint64_t)ComputeAddress(m, m->xedd->op.rde));
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}
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