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/*
* Semihosting System HEAPINFO Test
*
* Copyright (c) 2021 Linaro Ltd
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <stdint.h>
#include <stddef.h>
#include <minilib.h>
#define SYS_HEAPINFO 0x16
uintptr_t __semi_call(uintptr_t type, uintptr_t arg0)
{
register uintptr_t t asm("x0") = type;
register uintptr_t a0 asm("x1") = arg0;
asm("hlt 0xf000"
: "=r" (t)
: "r" (t), "r" (a0)
: "memory" );
return t;
}
int main(int argc, char *argv[argc])
{
struct {
void *heap_base;
void *heap_limit;
void *stack_base;
void *stack_limit;
} info = { };
void *ptr_to_info = (void *) &info;
uint32_t *ptr_to_heap;
int i;
ml_printf("Semihosting Heap Info Test\n");
__semi_call(SYS_HEAPINFO, (uintptr_t) &ptr_to_info);
if (info.heap_base == NULL || info.heap_limit == NULL) {
ml_printf("null heap: %p -> %p\n", info.heap_base, info.heap_limit);
return -1;
}
/* Error if heap base is above limit */
if ((uintptr_t) info.heap_base >= (uintptr_t) info.heap_limit) {
ml_printf("heap base %p >= heap_limit %p\n",
info.heap_base, info.heap_limit);
return -2;
}
if (info.stack_base == NULL) {
ml_printf("null stack: %p -> %p\n", info.stack_base, info.stack_limit);
return -3;
}
/*
* boot.S put our stack somewhere inside the data segment of the
* ELF file, and we know that SYS_HEAPINFO won't pick a range
* that overlaps with part of a loaded ELF file. So the info
* struct (on the stack) should not be inside the reported heap.
*/
if (ptr_to_info > info.heap_base && ptr_to_info < info.heap_limit) {
ml_printf("info appears to be inside the heap: %p in %p:%p\n",
ptr_to_info, info.heap_base, info.heap_limit);
return -4;
}
ml_printf("heap: %p -> %p\n", info.heap_base, info.heap_limit);
ml_printf("stack: %p <- %p\n", info.stack_limit, info.stack_base);
/* finally can we read/write the heap */
ptr_to_heap = (uint32_t *) info.heap_base;
for (i = 0; i < 512; i++) {
*ptr_to_heap++ = i;
}
ptr_to_heap = (uint32_t *) info.heap_base;
for (i = 0; i < 512; i++) {
uint32_t tmp = *ptr_to_heap;
if (tmp != i) {
ml_printf("unexpected value in heap: %d @ %p", tmp, ptr_to_heap);
return -5;
}
ptr_to_heap++;
}
ml_printf("r/w to heap upto %p\n", ptr_to_heap);
ml_printf("Passed HeapInfo checks\n");
return 0;
}
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