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esp-open-rtos/examples/experiments/unaligned_load/unaligned_load.c
Alex Stewart 9d62d09d3f unaligned_load.c: Added more naive_strcpy tests 
Added tests for naive_strcpy using a variety of different regs, as execution time can depend on which register is being used.
2015-09-19 20:03:22 -07:00

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/* Very basic example that just demonstrates we can run at all!
*/
#include "esp/rom.h"
#include "esp/timer.h"
#include "espressif/esp_common.h"
#include "espressif/sdk_private.h"
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "string.h"
#include "strings.h"
#define TESTSTRING "O hai there! %d %d %d"
const char *dramtest = TESTSTRING;
const __attribute__((section(".iram1.notrodata"))) char iramtest[] = TESTSTRING;
const __attribute__((section(".text.notrodata"))) char iromtest[] = TESTSTRING;
INLINED uint32_t get_ccount (void)
{
uint32_t ccount;
asm volatile ("rsr.ccount %0" : "=a" (ccount));
return ccount;
}
typedef void (* test_with_fn_t)(const char *string);
char buf[64];
void test_memcpy_aligned(const char *string)
{
memcpy(buf, string, 16);
}
void test_memcpy_unaligned(const char *string)
{
memcpy(buf, string, 15);
}
void test_memcpy_unaligned2(const char *string)
{
memcpy(buf, string+1, 15);
}
void test_strcpy(const char *string)
{
strcpy(buf, string);
}
void test_sprintf(const char *string)
{
sprintf(buf, string, 1, 2, 3);
}
void test_sprintf_arg(const char *string)
{
sprintf(buf, "%s", string);
}
void test_naive_strcpy(const char *string)
{
char *to = buf;
while((*to++ = *string++))
;
}
void test_naive_strcpy_a0(const char *string)
{
asm volatile (
" mov a8, %0 \n"
" mov a9, %1 \n"
"tns_loop%=: l8ui a0, a9, 0 \n"
" addi.n a9, a9, 1 \n"
" s8i a0, a8, 0 \n"
" addi.n a8, a8, 1 \n"
" bnez a0, tns_loop%=\n"
: : "r" (buf), "r" (string) : "a0", "a8", "a9");
}
void test_naive_strcpy_a2(const char *string)
{
asm volatile (
" mov a8, %0 \n"
" mov a9, %1 \n"
"tns_loop%=: l8ui a2, a9, 0 \n"
" addi.n a9, a9, 1 \n"
" s8i a2, a8, 0 \n"
" addi.n a8, a8, 1 \n"
" bnez a2, tns_loop%=\n"
: : "r" (buf), "r" (string) : "a2", "a8", "a9");
}
void test_naive_strcpy_a3(const char *string)
{
asm volatile (
" mov a8, %0 \n"
" mov a9, %1 \n"
"tns_loop%=: l8ui a3, a9, 0 \n"
" addi.n a9, a9, 1 \n"
" s8i a3, a8, 0 \n"
" addi.n a8, a8, 1 \n"
" bnez a3, tns_loop%=\n"
: : "r" (buf), "r" (string) : "a3", "a8", "a9");
}
void test_naive_strcpy_a4(const char *string)
{
asm volatile (
" mov a8, %0 \n"
" mov a9, %1 \n"
"tns_loop%=: l8ui a4, a9, 0 \n"
" addi.n a9, a9, 1 \n"
" s8i a4, a8, 0 \n"
" addi.n a8, a8, 1 \n"
" bnez a4, tns_loop%=\n"
: : "r" (buf), "r" (string) : "a4", "a8", "a9");
}
void test_naive_strcpy_a5(const char *string)
{
asm volatile (
" mov a8, %0 \n"
" mov a9, %1 \n"
"tns_loop%=: l8ui a5, a9, 0 \n"
" addi.n a9, a9, 1 \n"
" s8i a5, a8, 0 \n"
" addi.n a8, a8, 1 \n"
" bnez a5, tns_loop%=\n"
: : "r" (buf), "r" (string) : "a5", "a8", "a9");
}
void test_naive_strcpy_a6(const char *string)
{
asm volatile (
" mov a8, %0 \n"
" mov a9, %1 \n"
"tns_loop%=: l8ui a6, a9, 0 \n"
" addi.n a9, a9, 1 \n"
" s8i a6, a8, 0 \n"
" addi.n a8, a8, 1 \n"
" bnez a6, tns_loop%=\n"
: : "r" (buf), "r" (string) : "a6", "a8", "a9");
}
void test_l16si(const char *string)
{
/* This follows most of the l16si path, but as the
values in the string are all 7 bit none of them get sign extended.
See separate test_sign_extension function which validates
sign extension works as expected.
*/
int16_t *src_int16 = (int16_t *)string;
int32_t *dst_int32 = (int32_t *)buf;
dst_int32[0] = src_int16[0];
dst_int32[1] = src_int16[1];
dst_int32[2] = src_int16[2];
}
#define TEST_REPEATS 1000
void test_noop(const char *string)
{
}
uint32_t IRAM run_test(const char *string, test_with_fn_t testfn, const char *testfn_label, uint32_t nullvalue, bool evict_cache)
{
printf(" .. against %30s: ", testfn_label);
vPortEnterCritical();
uint32_t before = get_ccount();
for(int i = 0; i < TEST_REPEATS; i++) {
testfn(string);
if(evict_cache) {
Cache_Read_Disable();
Cache_Read_Enable(0,0,1);
}
}
uint32_t after = get_ccount();
vPortExitCritical();
uint32_t instructions = (after-before)/TEST_REPEATS - nullvalue;
printf("%5d instructions\r\n", instructions);
return instructions;
}
void test_string(const char *string, char *label, bool evict_cache)
{
printf("Testing %s (%p) '%s'\r\n", label, string, string);
printf("Formats as: '");
printf(string, 1, 2, 3);
printf("'\r\n");
uint32_t nullvalue = run_test(string, test_noop, "null op", 0, evict_cache);
run_test(string, test_memcpy_aligned, "memcpy - aligned len", nullvalue, evict_cache);
run_test(string, test_memcpy_unaligned, "memcpy - unaligned len", nullvalue, evict_cache);
run_test(string, test_memcpy_unaligned2, "memcpy - unaligned start&len", nullvalue, evict_cache);
run_test(string, test_strcpy, "strcpy", nullvalue, evict_cache);
run_test(string, test_naive_strcpy, "naive strcpy", nullvalue, evict_cache);
run_test(string, test_naive_strcpy_a0, "naive strcpy (a0)", nullvalue, evict_cache);
run_test(string, test_naive_strcpy_a2, "naive strcpy (a2)", nullvalue, evict_cache);
run_test(string, test_naive_strcpy_a3, "naive strcpy (a3)", nullvalue, evict_cache);
run_test(string, test_naive_strcpy_a4, "naive strcpy (a4)", nullvalue, evict_cache);
run_test(string, test_naive_strcpy_a5, "naive strcpy (a5)", nullvalue, evict_cache);
run_test(string, test_naive_strcpy_a6, "naive strcpy (a6)", nullvalue, evict_cache);
run_test(string, test_sprintf, "sprintf", nullvalue, evict_cache);
run_test(string, test_sprintf_arg, "sprintf format arg", nullvalue, evict_cache);
run_test(string, test_l16si, "load as l16si", nullvalue, evict_cache);
}
static void test_doubleexception();
static void test_sign_extension();
void sanity_tests(void);
void user_init(void)
{
sdk_uart_div_modify(0, UART_CLK_FREQ / 115200);
gpio_enable(2, GPIO_OUTPUT); /* used for LED debug */
gpio_write(2, 1); /* active low */
printf("\r\n\r\nSDK version:%s\r\n", sdk_system_get_sdk_version());
sanity_tests();
test_string(dramtest, "DRAM", 0);
test_string(iramtest, "IRAM", 0);
test_string(iromtest, "Cached flash", 0);
test_string(iromtest, "'Uncached' flash", 1);
test_doubleexception();
test_sign_extension();
}
static volatile bool frc1_ran;
static volatile bool frc1_finished;
static volatile char frc1_buf[80];
static void frc1_interrupt_handler(void)
{
frc1_ran = true;
timer_set_run(FRC1, false);
strcpy((char *)frc1_buf, iramtest);
frc1_finished = true;
}
static void test_doubleexception()
{
printf("Testing DoubleException behaviour...\r\n");
timer_set_interrupts(FRC1, false);
timer_set_run(FRC1, false);
_xt_isr_attach(INUM_TIMER_FRC1, frc1_interrupt_handler);
timer_set_frequency(FRC1, 1000);
timer_set_interrupts(FRC1, true);
timer_set_run(FRC1, true);
sdk_os_delay_us(2000);
if(!frc1_ran)
printf("ERROR: FRC1 timer exception never fired.\r\n");
else if(!frc1_finished)
printf("ERROR: FRC1 timer exception never finished.\r\n");
else if(strcmp((char *)frc1_buf, iramtest))
printf("ERROR: FRC1 strcpy from IRAM failed.\r\n");
else
printf("PASSED\r\n");
}
const volatile __attribute__((section(".iram1.notliterals"))) int16_t unsigned_shorts[] = { -3, -4, -5, -32767, 44 };
static void test_sign_extension()
{
/* this step seems to be necessary so the compiler will actually generate l16si */
int16_t *shorts_p = (int16_t *)unsigned_shorts;
if(shorts_p[0] == -3 && shorts_p[1] == -4 && shorts_p[2] == -5 && shorts_p[3] == -32767 && shorts_p[4] == 44)
{
printf("l16si sign extension worked as expected.\r\n");
} else {
printf("l16si sign extension failed. Got values %d %d %d %d %d\r\n", shorts_p[0], shorts_p[1], shorts_p[2], shorts_p[3], shorts_p[4]);
}
}
/* The following "sanity tests" are designed to try to execute every code path
* of the LoadStoreError handler, with a variety of offsets and data values
* designed to catch any mask/shift errors, sign-extension bugs, etc */
/* (Contrary to expectations, 'mov a15, a15' in Xtensa is not technically a
* no-op, but is officially "undefined and reserved for future use", so we need
* a special case in the case where reg == "a15" so we don't end up generating
* those opcodes. GCC is smart enough to optimize away the whole conditional
* and just insert the correct asm block, since `reg` is a static argument.) */
#define LOAD_VIA_REG(op, reg, addr, var) \
if (strcmp(reg, "a15")) { \
asm volatile ( \
"mov a15, " reg "\n\t" \
op " " reg ", %1, 0\n\t" \
"mov %0, " reg "\n\t" \
"mov " reg ", a15\n\t" \
: "=r" (var) : "r" (addr) : "a15" ); \
} else { \
asm volatile ( \
op " " reg ", %1, 0\n\t" \
"mov %0, " reg "\n\t" \
: "=r" (var) : "r" (addr) : "a15" ); \
}
#define TEST_LOAD(op, reg, addr, value) \
{ \
int32_t result; \
LOAD_VIA_REG(op, reg, addr, result); \
if (result != value) sanity_test_failed(op, reg, addr, value, result); \
}
void sanity_test_failed(const char *testname, const char *reg, const void *addr, int32_t value, int32_t result) {
uint32_t actual_data = *(uint32_t *)((uint32_t)addr & 0xfffffffc);
printf("*** SANITY TEST FAILED: '%s %s' from %p (underlying 32-bit value: 0x%x): Expected 0x%08x (%d), got 0x%08x (%d)\n", testname, reg, addr, actual_data, value, value, result, result);
}
const __attribute__((section(".iram1.notrodata"))) char sanity_test_data[] = {
0x01, 0x55, 0x7e, 0x2a, 0x81, 0xd5, 0xfe, 0xaa
};
void sanity_test_l8ui(const void *addr, int32_t value) {
TEST_LOAD("l8ui", "a0", addr, value);
TEST_LOAD("l8ui", "a1", addr, value);
TEST_LOAD("l8ui", "a2", addr, value);
TEST_LOAD("l8ui", "a3", addr, value);
TEST_LOAD("l8ui", "a4", addr, value);
TEST_LOAD("l8ui", "a5", addr, value);
TEST_LOAD("l8ui", "a6", addr, value);
TEST_LOAD("l8ui", "a7", addr, value);
TEST_LOAD("l8ui", "a8", addr, value);
TEST_LOAD("l8ui", "a9", addr, value);
TEST_LOAD("l8ui", "a10", addr, value);
TEST_LOAD("l8ui", "a11", addr, value);
TEST_LOAD("l8ui", "a12", addr, value);
TEST_LOAD("l8ui", "a13", addr, value);
TEST_LOAD("l8ui", "a14", addr, value);
TEST_LOAD("l8ui", "a15", addr, value);
}
void sanity_test_l16ui(const void *addr, int32_t value) {
TEST_LOAD("l16ui", "a0", addr, value);
TEST_LOAD("l16ui", "a1", addr, value);
TEST_LOAD("l16ui", "a2", addr, value);
TEST_LOAD("l16ui", "a3", addr, value);
TEST_LOAD("l16ui", "a4", addr, value);
TEST_LOAD("l16ui", "a5", addr, value);
TEST_LOAD("l16ui", "a6", addr, value);
TEST_LOAD("l16ui", "a7", addr, value);
TEST_LOAD("l16ui", "a8", addr, value);
TEST_LOAD("l16ui", "a9", addr, value);
TEST_LOAD("l16ui", "a10", addr, value);
TEST_LOAD("l16ui", "a11", addr, value);
TEST_LOAD("l16ui", "a12", addr, value);
TEST_LOAD("l16ui", "a13", addr, value);
TEST_LOAD("l16ui", "a14", addr, value);
TEST_LOAD("l16ui", "a15", addr, value);
}
void sanity_test_l16si(const void *addr, int32_t value) {
TEST_LOAD("l16si", "a0", addr, value);
TEST_LOAD("l16si", "a1", addr, value);
TEST_LOAD("l16si", "a2", addr, value);
TEST_LOAD("l16si", "a3", addr, value);
TEST_LOAD("l16si", "a4", addr, value);
TEST_LOAD("l16si", "a5", addr, value);
TEST_LOAD("l16si", "a6", addr, value);
TEST_LOAD("l16si", "a7", addr, value);
TEST_LOAD("l16si", "a8", addr, value);
TEST_LOAD("l16si", "a9", addr, value);
TEST_LOAD("l16si", "a10", addr, value);
TEST_LOAD("l16si", "a11", addr, value);
TEST_LOAD("l16si", "a12", addr, value);
TEST_LOAD("l16si", "a13", addr, value);
TEST_LOAD("l16si", "a14", addr, value);
TEST_LOAD("l16si", "a15", addr, value);
}
void sanity_tests(void) {
printf("== Performing sanity tests (sanity_test_data @ %p)...\n", sanity_test_data);
sanity_test_l8ui(sanity_test_data + 0, 0x01);
sanity_test_l8ui(sanity_test_data + 1, 0x55);
sanity_test_l8ui(sanity_test_data + 2, 0x7e);
sanity_test_l8ui(sanity_test_data + 3, 0x2a);
sanity_test_l8ui(sanity_test_data + 4, 0x81);
sanity_test_l8ui(sanity_test_data + 5, 0xd5);
sanity_test_l8ui(sanity_test_data + 6, 0xfe);
sanity_test_l8ui(sanity_test_data + 7, 0xaa);
sanity_test_l16ui(sanity_test_data + 0, 0x5501);
sanity_test_l16ui(sanity_test_data + 2, 0x2a7e);
sanity_test_l16ui(sanity_test_data + 4, 0xd581);
sanity_test_l16ui(sanity_test_data + 6, 0xaafe);
sanity_test_l16si(sanity_test_data + 0, 0x5501);
sanity_test_l16si(sanity_test_data + 2, 0x2a7e);
sanity_test_l16si(sanity_test_data + 4, -10879);
sanity_test_l16si(sanity_test_data + 6, -21762);
printf("== Sanity tests completed.\n");
}
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