static void
test_x64_abs_addr(void *dc)
{
/* 48 a1 ef be ad de ef be ad de mov 0xdeadbeefdeadbeef -> %rax
* 48 a3 ef be ad de ef be ad de mov %rax -> 0xdeadbeefdeadbeef
*/
instr_t *instr;
opnd_t abs_addr = opnd_create_abs_addr((void*)0xdeadbeefdeadbeef, OPSZ_8);
/* movabs load */
instr = INSTR_CREATE_mov_ld(dc, opnd_create_reg(DR_REG_RAX), abs_addr);
test_instr_encode(dc, instr, 10); /* REX + op + 8 */
/* movabs store */
instr = INSTR_CREATE_mov_st(dc, abs_addr, opnd_create_reg(DR_REG_RAX));
test_instr_encode(dc, instr, 10); /* REX + op + 8 */
}
static void
reachability_test(void)
{
void *drcontext = dr_get_current_drcontext();
instrlist_t *ilist = instrlist_create(drcontext);
byte *gencode = (byte *)
dr_nonheap_alloc(PAGE_SIZE, DR_MEMPROT_READ|DR_MEMPROT_WRITE|DR_MEMPROT_EXEC);
byte *pc;
int res;
byte *highmem = PREFERRED_ADDR;
pc = dr_raw_mem_alloc(PAGE_SIZE, DR_MEMPROT_READ|DR_MEMPROT_WRITE|
DR_MEMPROT_EXEC, highmem);
ASSERT(pc == highmem);
dr_fprintf(STDERR, " reachability test...");
/* Test auto-magically turning rip-rel that won't reach but targets xax
* into absmem.
*/
instrlist_append(ilist, INSTR_CREATE_mov_ld
(drcontext, opnd_create_reg(DR_REG_EAX),
opnd_create_rel_addr(highmem, OPSZ_4)));
instrlist_append(ilist, INSTR_CREATE_ret(drcontext));
pc = instrlist_encode(drcontext, ilist, gencode, false);
instrlist_clear(drcontext, ilist);
ASSERT(pc < gencode + PAGE_SIZE);
*(int*)highmem = 0x12345678;
res = ((int (*)(void))gencode)();
ASSERT(res == 0x12345678);
/* Test auto-magically turning a reachable absmem into a rip-rel. */
instrlist_append(ilist, INSTR_CREATE_mov_ld
(drcontext, opnd_create_reg(DR_REG_ECX),
opnd_create_abs_addr(highmem + 0x800, OPSZ_4)));
instrlist_append(ilist, INSTR_CREATE_mov_ld
(drcontext, opnd_create_reg(DR_REG_EAX),
opnd_create_reg(DR_REG_ECX)));
instrlist_append(ilist, INSTR_CREATE_ret(drcontext));
pc = instrlist_encode(drcontext, ilist, highmem, false);
instrlist_clear(drcontext, ilist);
ASSERT(pc < highmem + PAGE_SIZE);
*(int*)(highmem + 0x800) = 0x12345678;
res = ((int (*)(void))highmem)();
ASSERT(res == 0x12345678);
dr_raw_mem_free(highmem, PAGE_SIZE);
/* Test targeting upper 2GB of low 4GB */
highmem = dr_raw_mem_alloc(PAGE_SIZE, DR_MEMPROT_READ|DR_MEMPROT_WRITE|
DR_MEMPROT_EXEC, (byte *)0xabcd0000);
instrlist_append(ilist, INSTR_CREATE_mov_ld
(drcontext, opnd_create_reg(DR_REG_ECX),
opnd_create_abs_addr(highmem, OPSZ_4)));
instrlist_append(ilist, INSTR_CREATE_mov_ld
(drcontext, opnd_create_reg(DR_REG_EAX),
opnd_create_reg(DR_REG_ECX)));
instrlist_append(ilist, INSTR_CREATE_ret(drcontext));
pc = instrlist_encode(drcontext, ilist, gencode, false);
instrlist_clear(drcontext, ilist);
ASSERT(pc < gencode + PAGE_SIZE);
*(int*)highmem = 0x12345678;
res = ((int (*)(void))gencode)();
ASSERT(res == 0x12345678);
dr_raw_mem_free(highmem, PAGE_SIZE);
/* Test targeting lower 2GB of low 4GB */
highmem = dr_raw_mem_alloc(PAGE_SIZE, DR_MEMPROT_READ|DR_MEMPROT_WRITE|
DR_MEMPROT_EXEC, (byte *)0x143d0000);
instrlist_append(ilist, INSTR_CREATE_mov_ld
(drcontext, opnd_create_reg(DR_REG_ECX),
opnd_create_abs_addr(highmem, OPSZ_4)));
instrlist_append(ilist, INSTR_CREATE_mov_ld
(drcontext, opnd_create_reg(DR_REG_EAX),
opnd_create_reg(DR_REG_ECX)));
instrlist_append(ilist, INSTR_CREATE_ret(drcontext));
pc = instrlist_encode(drcontext, ilist, gencode, false);
instrlist_clear(drcontext, ilist);
ASSERT(pc < gencode + PAGE_SIZE);
*(int*)highmem = 0x12345678;
res = ((int (*)(void))gencode)();
ASSERT(res == 0x12345678);
dr_raw_mem_free(highmem, PAGE_SIZE);
instrlist_clear_and_destroy(drcontext, ilist);
dr_nonheap_free(gencode, PAGE_SIZE);
test_instr_as_immed();
dr_fprintf(STDERR, "success\n");
}