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/* Test MPU small memory regions
*/
#include "armv7m.h"
#include "testme.h"
static inline void test_equal(const char *m, uint32_t expect, uint32_t actual)
{
testEqI(expect, actual, "%s", m);
}
char __end_rom, __after_all_load;
char testpage[1024] __attribute__((aligned(1024)));
static
void try(volatile char *p)
{
uint32_t tval = 0;
testDiag("Try %" PRIx32, (uint32_t)p);
__asm__ ("mov %r0, #'X'; ldr %r0, [%r1]" : "+r"(tval) : "r"(p) :);
testDiag("Got %" PRIx32, tval);
}
#define EXPECT_NO_FAULT 1
#define EXPECT_MEMFAULT 2
#define EXPECT_TAKEN_MEMFAULT 3
#define EXPECT_HARDFAULT 10
#define EXPECT_TAKEN_HARDFAULT 11
static volatile unsigned expect_fault = EXPECT_NO_FAULT;
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
static const char *expect_fault_name[] = {
[EXPECT_NO_FAULT] = "no fault",
[EXPECT_MEMFAULT] = "MemManage fault",
[EXPECT_TAKEN_MEMFAULT] = "MemManage fault taken",
[EXPECT_HARDFAULT] = "HardFault",
[EXPECT_TAKEN_HARDFAULT] = "HardFault taken",
};
const char *faultname(unsigned int f)
{
if (f > ARRAY_SIZE(expect_fault_name) || !expect_fault_name[f]) {
/* This would be a test case code error */
testDiag("faultname passed bad expect_fault state 0x%x", f);
abort();
}
return expect_fault_name[f];
}
static
void checkfault(unsigned v)
{
if (v == expect_fault) {
testPass("%s as expected", faultname(v));
} else {
int curstate = expect_fault;
/* If expect_fault is still EXPECT_MEMFAULT or EXPECT_HARDFAULT
* then we didn't actually take a fault, so report that as
* "no fault".
*/
if (curstate == EXPECT_MEMFAULT || curstate == EXPECT_HARDFAULT) {
curstate = EXPECT_NO_FAULT;
}
testFail("expected %s but %s", faultname(v), faultname(curstate));
}
}
void hard(uint32_t *sp)
{
testDiag("In HardFault handler");
if(expect_fault==EXPECT_HARDFAULT) {
sp = get_src_stack(sp);
inst_skip(sp);
expect_fault = EXPECT_TAKEN_HARDFAULT;
return;
}
testDiag("Unexpected HardFault!!");
abort();
}
static __attribute__((naked))
void hard_entry(void)
{
asm("mov r0, sp");
asm("b hard");
}
void mem(uint32_t *sp)
{
uint32_t addr;
sp = get_src_stack(sp);
inst_skip(sp);
addr = in32((void*)0xe000ed34);
testDiag("In MemFault, Addr 0x%" PRIx32 ", from 0x%" PRIx32, addr, sp[6]);
switch(expect_fault) {
case EXPECT_MEMFAULT:
expect_fault = EXPECT_TAKEN_MEMFAULT;
break;
case EXPECT_NO_FAULT:
testDiag("Unexpected MemFault!!");
abort();
default:
testDiag("Unexpected state 0x%x", expect_fault);
abort();
}
}
static __attribute__((naked))
void mem_entry(void)
{
asm("mov r0, sp");
asm("b mem");
}
static inline
void drop_priv(void)
{
uint32_t val;
__asm__ ("mrs %0, CONTROL" : "=r"(val) ::);
val |= 1;
__asm__ ("msr CONTROL, %0" :: "r"(val) :);
}
void svc(void *sp)
{
int num;
sp = get_src_stack(sp);
num = get_svc(sp);
if(num<0) {
testDiag("SVC but not looking at an SVC insn??\n");
abort();
} else {
testDiag("SVC 0x%x", num);
}
switch(num) {
case 1: /* restore privlage */
{
uint32_t val;
__asm__ ("mrs %0, CONTROL" : "=r"(val) ::);
val &= ~1;
__asm__ ("msr CONTROL, %0" :: "r"(val) :);
}
break;
case 2:
abort();
default:
testDiag("Unknown SVC request value");
abort();
}
}
static __attribute__((naked))
void svc_entry(void)
{
asm("mov r0, sp");
asm("b svc");
}
void main(void)
{
int has_mpu;
uint32_t mpu_type;
run_table.hard = &hard_entry;
run_table.svc = &svc_entry;
run_table.mem = &mem_entry;
mpu_type = in32(SCB(0xD90));
has_mpu = ((mpu_type >> 8) & 0xff) != 0;
testInit(4);
if (!has_mpu) {
testDiag("No MPU present: nothing to test here");
testDiag("Done.");
return;
}
out32(SCB(0xd24), 1<<16); // enable MemFault with SHCSR
testDiag("In Main");
expect_fault = EXPECT_NO_FAULT;
/* priority of entries is highest to lowest (0 checked last) */
set_mpu(0, 0x00000000, (uint32_t)&__end_rom, MPU_NORMAL|MPU_RORO);
set_mpu(1, 0x20000000, 0x00080000, MPU_NORMAL|MPU_RWRW|MPU_XN);
set_mpu(2, 0x4000c000, 0x00001000, MPU_DEVICE|MPU_RWRW|MPU_XN);
set_mpu(3, 0xe000e000, 0x00001000, MPU_DEVICE|MPU_RWRW|MPU_XN);
/* Create several small regions inside testpage:
* accessible in the middle, surrounded by regions which
* are not accessible.
*/
set_mpu(4, (uint32_t)testpage, 512,
MPU_XN|MPU_NORMAL|MPU_NANA);
set_mpu(5, (uint32_t)testpage + 512, 256,
MPU_XN|MPU_NORMAL|MPU_RWRW);
set_mpu(6, (uint32_t)testpage + 768, 256,
MPU_XN|MPU_NORMAL|MPU_NANA);
testDiag("Enable MPU");
enable_mpu(1,1,0);
testDiag("Access the accessible small page (should not fault)");
expect_fault = EXPECT_NO_FAULT;
try(testpage + 600);
checkfault(EXPECT_NO_FAULT);
expect_fault = EXPECT_MEMFAULT;
testDiag("Access the preceding small page (should fault)");
try(testpage + 256);
checkfault(EXPECT_TAKEN_MEMFAULT);
expect_fault = EXPECT_MEMFAULT;
testDiag("Access following small page (should fault)");
try(testpage + 768);
checkfault(EXPECT_TAKEN_MEMFAULT);
expect_fault = EXPECT_NO_FAULT;
testDiag("Access the accessible small page again (should not fault)");
try(testpage + 600);
checkfault(EXPECT_NO_FAULT);
testDiag("Done.");
}
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