OVMS3-idf/components/newlib/test/test_setjmp.c
Ivan Grokhotkov 891eb3b020 freertos: save/restore PS and EPC1 around window spilling
Since in b0491307, which has introduced the optimized window spill
procedure, _xt_context_save did not work correctly when called from
_xt_syscall_exc. This was because unlike _xt_lowint1, _xt_syscall_exc
does not save PS and EPC1. The new version of _xt_context_save
modified PS (on purpose) and EPC1 (accidentally, due to window
overflow exceptions), which resulted in a crash upon 'rfi' from the
syscall.

This commit adds restoring of PS and EPC1 in _xt_context_save. It also
slightly reduces the number of instructions used to prepare PS for
window spill.

Unit test for setjmp/longjmp (which were broken by this regression)
is added.

Closes https://github.com/espressif/esp-idf/issues/4541
2019-12-27 11:27:01 +01:00

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812 B
C

#include <setjmp.h>
#include <stdio.h>
#include "unity.h"
#include "esp_system.h"
typedef struct {
jmp_buf jmp_env;
uint32_t retval;
volatile bool inner_called;
} setjmp_test_ctx_t;
static __attribute__((noreturn)) void inner(setjmp_test_ctx_t *ctx)
{
printf("inner, retval=0x%x\n", ctx->retval);
ctx->inner_called = true;
longjmp(ctx->jmp_env, ctx->retval);
TEST_FAIL_MESSAGE("Should not reach here");
}
TEST_CASE("setjmp and longjmp", "[newlib]")
{
const uint32_t expected = 0x12345678;
setjmp_test_ctx_t ctx = {
.retval = expected
};
uint32_t ret = setjmp(ctx.jmp_env);
if (!ctx.inner_called) {
TEST_ASSERT_EQUAL(0, ret);
inner(&ctx);
} else {
TEST_ASSERT_EQUAL(expected, ret);
}
TEST_ASSERT(ctx.inner_called);
}