489 lines
15 KiB
C
489 lines
15 KiB
C
#include "unicorn_test.h"
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const uint64_t code_start = 0x1000;
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const uint64_t code_len = 0x4000;
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static void uc_common_setup(uc_engine **uc, uc_arch arch, uc_mode mode,
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const char *code, uint64_t size, uc_cpu_arm cpu)
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{
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OK(uc_open(arch, mode, uc));
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OK(uc_ctl_set_cpu_model(*uc, cpu));
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OK(uc_mem_map(*uc, code_start, code_len, UC_PROT_ALL));
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OK(uc_mem_write(*uc, code_start, code, size));
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}
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static void test_arm_nop()
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{
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uc_engine *uc;
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char code[] = "\x00\xf0\x20\xe3"; // nop
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int r_r0 = 0x1234;
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int r_r2 = 0x6789;
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uc_common_setup(&uc, UC_ARCH_ARM, UC_MODE_ARM, code, sizeof(code) - 1,
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UC_CPU_ARM_CORTEX_A15);
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OK(uc_reg_write(uc, UC_ARM_REG_R0, &r_r0));
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OK(uc_reg_write(uc, UC_ARM_REG_R2, &r_r2));
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OK(uc_emu_start(uc, code_start, code_start + sizeof(code) - 1, 0, 0));
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OK(uc_reg_read(uc, UC_ARM_REG_R0, &r_r0));
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OK(uc_reg_read(uc, UC_ARM_REG_R2, &r_r2));
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TEST_CHECK(r_r0 == 0x1234);
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TEST_CHECK(r_r2 == 0x6789);
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OK(uc_close(uc));
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}
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static void test_arm_thumb_sub()
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{
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uc_engine *uc;
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char code[] = "\x83\xb0"; // sub sp, #0xc
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int r_sp = 0x1234;
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uc_common_setup(&uc, UC_ARCH_ARM, UC_MODE_THUMB, code, sizeof(code) - 1,
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UC_CPU_ARM_CORTEX_A15);
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OK(uc_reg_write(uc, UC_ARM_REG_SP, &r_sp));
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OK(uc_emu_start(uc, code_start | 1, code_start + sizeof(code) - 1, 0, 0));
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OK(uc_reg_read(uc, UC_ARM_REG_SP, &r_sp));
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TEST_CHECK(r_sp == 0x1228);
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OK(uc_close(uc));
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}
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static void test_armeb_sub()
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{
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uc_engine *uc;
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char code[] =
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"\xe3\xa0\x00\x37\xe0\x42\x10\x03"; // mov r0, #0x37; sub r1, r2, r3
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int r_r0 = 0x1234;
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int r_r2 = 0x6789;
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int r_r3 = 0x3333;
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int r_r1;
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uc_common_setup(&uc, UC_ARCH_ARM, UC_MODE_ARM | UC_MODE_BIG_ENDIAN, code,
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sizeof(code) - 1, UC_CPU_ARM_CORTEX_A15);
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OK(uc_reg_write(uc, UC_ARM_REG_R0, &r_r0));
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OK(uc_reg_write(uc, UC_ARM_REG_R2, &r_r2));
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OK(uc_reg_write(uc, UC_ARM_REG_R3, &r_r3));
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OK(uc_emu_start(uc, code_start, code_start + sizeof(code) - 1, 0, 0));
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OK(uc_reg_read(uc, UC_ARM_REG_R0, &r_r0));
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OK(uc_reg_read(uc, UC_ARM_REG_R1, &r_r1));
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OK(uc_reg_read(uc, UC_ARM_REG_R2, &r_r2));
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OK(uc_reg_read(uc, UC_ARM_REG_R3, &r_r3));
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TEST_CHECK(r_r0 == 0x37);
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TEST_CHECK(r_r2 == 0x6789);
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TEST_CHECK(r_r3 == 0x3333);
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TEST_CHECK(r_r1 == 0x3456);
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OK(uc_close(uc));
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}
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static void test_arm_thumbeb_sub()
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{
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uc_engine *uc;
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char code[] = "\xb0\x83"; // sub sp, #0xc
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int r_sp = 0x1234;
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uc_common_setup(&uc, UC_ARCH_ARM, UC_MODE_THUMB | UC_MODE_BIG_ENDIAN, code,
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sizeof(code) - 1, UC_CPU_ARM_CORTEX_A15);
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OK(uc_reg_write(uc, UC_ARM_REG_SP, &r_sp));
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OK(uc_emu_start(uc, code_start | 1, code_start + sizeof(code) - 1, 0, 0));
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OK(uc_reg_read(uc, UC_ARM_REG_SP, &r_sp));
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TEST_CHECK(r_sp == 0x1228);
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OK(uc_close(uc));
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}
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static void test_arm_thumb_ite_count_callback(uc_engine *uc, uint64_t address,
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uint32_t size, void *user_data)
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{
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uint64_t *count = (uint64_t *)user_data;
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(*count) += 1;
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}
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static void test_arm_thumb_ite()
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{
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uc_engine *uc;
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uc_hook hook;
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char code[] =
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"\x9a\x42\x15\xbf\x00\x9a\x01\x9a\x78\x23\x15\x23"; // cmp r2, r3; itete
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// ne; ldrne r2,
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// [sp]; ldreq r2,
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// [sp,#4]; movne
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// r3, #0x78; moveq
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// r3, #0x15
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int r_sp = 0x8000;
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int r_r2 = 0;
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int r_r3 = 1;
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int r_pc = 0;
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uint64_t count = 0;
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uc_common_setup(&uc, UC_ARCH_ARM, UC_MODE_THUMB, code, sizeof(code) - 1,
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UC_CPU_ARM_CORTEX_A15);
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OK(uc_reg_write(uc, UC_ARM_REG_SP, &r_sp));
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OK(uc_reg_write(uc, UC_ARM_REG_R2, &r_r2));
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OK(uc_reg_write(uc, UC_ARM_REG_R3, &r_r3));
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OK(uc_mem_map(uc, r_sp, 0x1000, UC_PROT_ALL));
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r_r2 = 0x68;
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OK(uc_mem_write(uc, r_sp, &r_r2, 4));
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r_r2 = 0x4d;
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OK(uc_mem_write(uc, r_sp + 4, &r_r2, 4));
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OK(uc_hook_add(uc, &hook, UC_HOOK_CODE, test_arm_thumb_ite_count_callback,
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&count, 1, 0));
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// Execute four instructions at a time.
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OK(uc_emu_start(uc, code_start | 1, code_start + sizeof(code) - 1, 0, 0));
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OK(uc_reg_read(uc, UC_ARM_REG_R2, &r_r2));
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OK(uc_reg_read(uc, UC_ARM_REG_R3, &r_r3));
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TEST_CHECK(r_r2 == 0x68);
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TEST_CHECK(count == 4);
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r_pc = code_start;
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r_r2 = 0;
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count = 0;
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OK(uc_reg_write(uc, UC_ARM_REG_R2, &r_r2));
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OK(uc_reg_write(uc, UC_ARM_REG_R3, &r_r3));
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for (int i = 0; i < 6 && r_pc < code_start + sizeof(code) - 1; i++) {
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// Execute one instruction at a time.
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OK(uc_emu_start(uc, r_pc | 1, code_start + sizeof(code) - 1, 0, 1));
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OK(uc_reg_read(uc, UC_ARM_REG_PC, &r_pc));
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}
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OK(uc_reg_read(uc, UC_ARM_REG_R2, &r_r2));
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TEST_CHECK(r_r2 == 0x68);
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TEST_CHECK(r_r3 == 0x78);
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TEST_CHECK(count == 4);
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OK(uc_close(uc));
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}
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static void test_arm_m_thumb_mrs()
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{
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uc_engine *uc;
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char code[] =
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"\xef\xf3\x14\x80\xef\xf3\x00\x81"; // mrs r0, control; mrs r1, apsr
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uint32_t r_control = 0b10;
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uint32_t r_apsr = (0b10101 << 27);
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uint32_t r_r0, r_r1;
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uc_common_setup(&uc, UC_ARCH_ARM, UC_MODE_THUMB | UC_MODE_MCLASS, code,
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sizeof(code) - 1, UC_CPU_ARM_CORTEX_A15);
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OK(uc_reg_write(uc, UC_ARM_REG_CONTROL, &r_control));
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OK(uc_reg_write(uc, UC_ARM_REG_APSR_NZCVQ, &r_apsr));
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OK(uc_emu_start(uc, code_start | 1, code_start + sizeof(code) - 1, 0, 0));
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OK(uc_reg_read(uc, UC_ARM_REG_R0, &r_r0));
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OK(uc_reg_read(uc, UC_ARM_REG_R1, &r_r1));
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TEST_CHECK(r_r0 == 0b10);
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TEST_CHECK(r_r1 == (0b10101 << 27));
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OK(uc_close(uc));
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}
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static void test_arm_m_control()
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{
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uc_engine *uc;
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int r_control, r_msp, r_psp;
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OK(uc_open(UC_ARCH_ARM, UC_MODE_THUMB | UC_MODE_MCLASS, &uc));
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r_control = 0; // Make sure we are using MSP.
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OK(uc_reg_write(uc, UC_ARM_REG_CONTROL, &r_control));
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r_msp = 0x1000;
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OK(uc_reg_write(uc, UC_ARM_REG_R13, &r_msp));
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r_control = 0b10; // Make the switch.
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OK(uc_reg_write(uc, UC_ARM_REG_CONTROL, &r_control));
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OK(uc_reg_read(uc, UC_ARM_REG_R13, &r_psp));
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TEST_CHECK(r_psp != r_msp);
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r_psp = 0x2000;
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OK(uc_reg_write(uc, UC_ARM_REG_R13, &r_psp));
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r_control = 0; // Switch again
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OK(uc_reg_write(uc, UC_ARM_REG_CONTROL, &r_control));
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OK(uc_reg_read(uc, UC_ARM_REG_R13, &r_msp));
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TEST_CHECK(r_psp != r_msp);
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TEST_CHECK(r_msp == 0x1000);
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OK(uc_close(uc));
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}
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//
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// Some notes:
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// Qemu raise a special exception EXCP_EXCEPTION_EXIT to handle the
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// EXC_RETURN. We can't help user handle EXC_RETURN since unicorn is designed
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// not to handle any CPU exception.
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//
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static void test_arm_m_exc_return_hook_interrupt(uc_engine *uc, int intno,
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void *data)
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{
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int r_pc;
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OK(uc_reg_read(uc, UC_ARM_REG_PC, &r_pc));
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TEST_CHECK(intno == 8); // EXCP_EXCEPTION_EXIT: Return from v7M exception.
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TEST_CHECK((r_pc | 1) == 0xFFFFFFFD);
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OK(uc_emu_stop(uc));
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}
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static void test_arm_m_exc_return()
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{
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uc_engine *uc;
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char code[] = "\x6f\xf0\x02\x00\x00\x47"; // mov r0, #0xFFFFFFFD; bx r0;
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int r_ipsr;
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int r_sp = 0x8000;
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uc_hook hook;
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uc_common_setup(&uc, UC_ARCH_ARM, UC_MODE_THUMB | UC_MODE_MCLASS, code,
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sizeof(code) - 1, UC_CPU_ARM_CORTEX_A15);
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OK(uc_mem_map(uc, r_sp - 0x1000, 0x1000, UC_PROT_ALL));
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OK(uc_hook_add(uc, &hook, UC_HOOK_INTR,
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test_arm_m_exc_return_hook_interrupt, NULL, 0, 0));
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r_sp -= 0x1c;
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OK(uc_reg_write(uc, UC_ARM_REG_SP, &r_sp));
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r_ipsr = 16; // We are in whatever exception.
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OK(uc_reg_write(uc, UC_ARM_REG_IPSR, &r_ipsr));
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OK(uc_emu_start(uc, code_start | 1, code_start + sizeof(code) - 1, 0,
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2)); // Just execute 2 instructions.
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OK(uc_hook_del(uc, hook));
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OK(uc_close(uc));
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}
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// For details, see https://github.com/unicorn-engine/unicorn/issues/1494.
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static void test_arm_und32_to_svc32()
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{
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uc_engine *uc;
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// # MVN r0, #0
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// # MOVS pc, lr
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// # MVN r0, #0
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// # MVN r0, #0
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char code[] =
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"\x00\x00\xe0\xe3\x0e\xf0\xb0\xe1\x00\x00\xe0\xe3\x00\x00\xe0\xe3";
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int r_cpsr, r_sp, r_spsr, r_lr;
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OK(uc_open(UC_ARCH_ARM, UC_MODE_ARM, &uc));
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OK(uc_ctl_set_cpu_model(uc, UC_CPU_ARM_CORTEX_A9));
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OK(uc_mem_map(uc, code_start, code_len, UC_PROT_ALL));
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OK(uc_mem_write(uc, code_start, code, sizeof(code) - 1));
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// https://www.keil.com/pack/doc/CMSIS/Core_A/html/group__CMSIS__CPSR__M.html
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r_cpsr = 0x40000093; // SVC32
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OK(uc_reg_write(uc, UC_ARM_REG_CPSR, &r_cpsr));
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r_sp = 0x12345678;
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OK(uc_reg_write(uc, UC_ARM_REG_SP, &r_sp));
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r_cpsr = 0x4000009b; // UND32
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OK(uc_reg_write(uc, UC_ARM_REG_CPSR, &r_cpsr));
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r_spsr = 0x40000093; // Save previous CPSR
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OK(uc_reg_write(uc, UC_ARM_REG_SPSR, &r_spsr));
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r_sp = 0xDEAD0000;
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OK(uc_reg_write(uc, UC_ARM_REG_SP, &r_sp));
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r_lr = code_start + 8;
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OK(uc_reg_write(uc, UC_ARM_REG_LR, &r_lr));
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OK(uc_emu_start(uc, code_start, code_start + sizeof(code) - 1, 0, 3));
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OK(uc_reg_read(uc, UC_ARM_REG_SP, &r_sp));
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TEST_CHECK(r_sp == 0x12345678);
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OK(uc_close(uc));
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}
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static void test_arm_usr32_to_svc32()
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{
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uc_engine *uc;
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int r_cpsr, r_sp, r_spsr, r_lr;
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OK(uc_open(UC_ARCH_ARM, UC_MODE_ARM, &uc));
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OK(uc_ctl_set_cpu_model(uc, UC_CPU_ARM_CORTEX_A9));
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// https://www.keil.com/pack/doc/CMSIS/Core_A/html/group__CMSIS__CPSR__M.html
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r_cpsr = 0x40000093; // SVC32
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OK(uc_reg_write(uc, UC_ARM_REG_CPSR, &r_cpsr));
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r_sp = 0x12345678;
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OK(uc_reg_write(uc, UC_ARM_REG_SP, &r_sp));
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r_lr = 0x00102220;
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OK(uc_reg_write(uc, UC_ARM_REG_LR, &r_lr));
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r_cpsr = 0x4000009b; // UND32
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OK(uc_reg_write(uc, UC_ARM_REG_CPSR, &r_cpsr));
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r_spsr = 0x40000093; // Save previous CPSR
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OK(uc_reg_write(uc, UC_ARM_REG_SPSR, &r_spsr));
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r_sp = 0xDEAD0000;
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OK(uc_reg_write(uc, UC_ARM_REG_SP, &r_sp));
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r_lr = 0x00509998;
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OK(uc_reg_write(uc, UC_ARM_REG_LR, &r_lr));
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OK(uc_reg_read(uc, UC_ARM_REG_CPSR, &r_cpsr));
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TEST_CHECK((r_cpsr & ((1 << 4) - 1)) == 0xb); // We are in UND32
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r_cpsr = 0x40000090; // USR32
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OK(uc_reg_write(uc, UC_ARM_REG_CPSR, &r_cpsr));
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r_sp = 0x0010000;
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OK(uc_reg_write(uc, UC_ARM_REG_R13, &r_sp));
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r_lr = 0x0001234;
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OK(uc_reg_write(uc, UC_ARM_REG_LR, &r_lr));
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OK(uc_reg_read(uc, UC_ARM_REG_CPSR, &r_cpsr));
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TEST_CHECK((r_cpsr & ((1 << 4) - 1)) == 0); // We are in USR32
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r_cpsr = 0x40000093; // SVC32
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OK(uc_reg_write(uc, UC_ARM_REG_CPSR, &r_cpsr));
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OK(uc_reg_read(uc, UC_ARM_REG_CPSR, &r_cpsr));
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OK(uc_reg_read(uc, UC_ARM_REG_SP, &r_sp));
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TEST_CHECK((r_cpsr & ((1 << 4) - 1)) == 3); // We are in SVC32
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TEST_CHECK(r_sp == 0x12345678);
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OK(uc_close(uc));
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}
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static void test_arm_v8()
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{
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char code[] = "\xd0\xe8\xff\x17"; // LDAEXD.W R1, [R0]
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uc_engine *uc;
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uint32_t r_r1 = 0xdeadbeef;
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uint32_t r_r0;
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uc_common_setup(&uc, UC_ARCH_ARM, UC_MODE_THUMB, code, sizeof(code) - 1,
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UC_CPU_ARM_CORTEX_M33);
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r_r0 = 0x8000;
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OK(uc_mem_map(uc, r_r0, 0x1000, UC_PROT_ALL));
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OK(uc_mem_write(uc, r_r0, (void *)&r_r1, 4));
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OK(uc_reg_write(uc, UC_ARM_REG_R0, &r_r0));
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OK(uc_emu_start(uc, code_start | 1, code_start + sizeof(code) - 1, 0, 0));
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OK(uc_reg_read(uc, UC_ARM_REG_R1, &r_r1));
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TEST_CHECK(r_r1 == 0xdeadbeef);
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OK(uc_close(uc));
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}
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static void test_arm_thumb_smlabb()
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{
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char code[] = "\x13\xfb\x01\x23";
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uint32_t r_r1, r_r2, r_r3;
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uc_engine *uc;
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uc_common_setup(&uc, UC_ARCH_ARM, UC_MODE_THUMB, code, sizeof(code) - 1,
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UC_CPU_ARM_CORTEX_M7);
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r_r3 = 5;
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r_r1 = 7;
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r_r2 = 9;
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OK(uc_reg_write(uc, UC_ARM_REG_R3, &r_r3));
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OK(uc_reg_write(uc, UC_ARM_REG_R1, &r_r1));
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OK(uc_reg_write(uc, UC_ARM_REG_R2, &r_r2));
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OK(uc_emu_start(uc, code_start | 1, code_start + sizeof(code) - 1, 0, 0));
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OK(uc_reg_read(uc, UC_ARM_REG_R3, &r_r3));
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TEST_CHECK(r_r3 == 5 * 7 + 9);
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OK(uc_close(uc));
|
|
}
|
|
|
|
static void test_arm_not_allow_privilege_escalation()
|
|
{
|
|
uc_engine *uc;
|
|
int r_cpsr, r_sp, r_spsr, r_lr;
|
|
// E3C6601F : BIC r6, r6, #&1F
|
|
// E3866013 : ORR r6, r6, #&13
|
|
// E121F006 : MSR cpsr_c, r6 ; switch to SVC32 (should be ineffective
|
|
// from USR32)
|
|
// E1A00000 : MOV r0,r0 EF000011 : SWI OS_Exit
|
|
char code[] = "\x1f\x60\xc6\xe3\x13\x60\x86\xe3\x06\xf0\x21\xe1\x00\x00\xa0"
|
|
"\xe1\x11\x00\x00\xef";
|
|
|
|
uc_common_setup(&uc, UC_ARCH_ARM, UC_MODE_ARM, code, sizeof(code) - 1,
|
|
UC_CPU_ARM_CORTEX_A15);
|
|
|
|
// https://www.keil.com/pack/doc/CMSIS/Core_A/html/group__CMSIS__CPSR.html
|
|
r_cpsr = 0x40000013; // SVC32
|
|
OK(uc_reg_write(uc, UC_ARM_REG_CPSR, &r_cpsr));
|
|
r_spsr = 0x40000013;
|
|
OK(uc_reg_write(uc, UC_ARM_REG_SPSR, &r_spsr));
|
|
r_sp = 0x12345678;
|
|
OK(uc_reg_write(uc, UC_ARM_REG_SP, &r_sp));
|
|
r_lr = 0x00102220;
|
|
OK(uc_reg_write(uc, UC_ARM_REG_LR, &r_lr));
|
|
|
|
r_cpsr = 0x40000010; // USR32
|
|
OK(uc_reg_write(uc, UC_ARM_REG_CPSR, &r_cpsr));
|
|
r_sp = 0x0010000;
|
|
OK(uc_reg_write(uc, UC_ARM_REG_SP, &r_sp));
|
|
r_lr = 0x0001234;
|
|
OK(uc_reg_write(uc, UC_ARM_REG_LR, &r_lr));
|
|
|
|
uc_assert_err(
|
|
UC_ERR_EXCEPTION,
|
|
uc_emu_start(uc, code_start, code_start + sizeof(code) - 1, 0, 0));
|
|
|
|
OK(uc_reg_read(uc, UC_ARM_REG_SP, &r_sp));
|
|
OK(uc_reg_read(uc, UC_ARM_REG_LR, &r_lr));
|
|
OK(uc_reg_read(uc, UC_ARM_REG_CPSR, &r_cpsr));
|
|
|
|
TEST_CHECK((r_cpsr & ((1 << 4) - 1)) == 0); // Stay in USR32
|
|
TEST_CHECK(r_lr == 0x1234);
|
|
TEST_CHECK(r_sp == 0x10000);
|
|
|
|
OK(uc_close(uc));
|
|
}
|
|
|
|
static void test_arm_mrc()
|
|
{
|
|
uc_engine *uc;
|
|
// mrc p15, #0, r0, c1, c1, #0
|
|
char code[] = "\x11\x0F\x11\xEE";
|
|
|
|
uc_common_setup(&uc, UC_ARCH_ARM, UC_MODE_ARM, code, sizeof(code) - 1,
|
|
UC_CPU_ARM_MAX);
|
|
|
|
OK(uc_emu_start(uc, code_start, code_start + sizeof(code) - 1, 0, 0));
|
|
|
|
OK(uc_close(uc));
|
|
}
|
|
|
|
TEST_LIST = {{"test_arm_nop", test_arm_nop},
|
|
{"test_arm_thumb_sub", test_arm_thumb_sub},
|
|
{"test_armeb_sub", test_armeb_sub},
|
|
{"test_arm_thumbeb_sub", test_arm_thumbeb_sub},
|
|
{"test_arm_thumb_ite", test_arm_thumb_ite},
|
|
{"test_arm_m_thumb_mrs", test_arm_m_thumb_mrs},
|
|
{"test_arm_m_control", test_arm_m_control},
|
|
{"test_arm_m_exc_return", test_arm_m_exc_return},
|
|
{"test_arm_und32_to_svc32", test_arm_und32_to_svc32},
|
|
{"test_arm_usr32_to_svc32", test_arm_usr32_to_svc32},
|
|
{"test_arm_v8", test_arm_v8},
|
|
{"test_arm_thumb_smlabb", test_arm_thumb_smlabb},
|
|
{"test_arm_not_allow_privilege_escalation",
|
|
test_arm_not_allow_privilege_escalation},
|
|
{"test_arm_mrc", test_arm_mrc},
|
|
{NULL, NULL}}; |