firmware/libcommon/source/pseudo_talloc.c

#include <stdint.h>

#include "talloc.h"
#include "trace.h"
#include "osmocom/core/utils.h"

#define NUM_RCTX_SMALL 10
#define RCTX_SIZE_SMALL 348

static uint8_t msgb_data[NUM_RCTX_SMALL][RCTX_SIZE_SMALL] __attribute__((aligned(sizeof(long))));
static uint8_t msgb_inuse[NUM_RCTX_SMALL];

void *_talloc_zero(const void *ctx, size_t size, const char *name)
{
	unsigned int i;
	unsigned long x;

	local_irq_save(x);
	if (size > RCTX_SIZE_SMALL) {
		local_irq_restore(x);
		TRACE_ERROR("%s() request too large(%d > %d)\r\n", __func__, size, RCTX_SIZE_SMALL);
		return NULL;
	}

	for (i = 0; i < ARRAY_SIZE(msgb_inuse); i++) {
		if (!msgb_inuse[i]) {
			uint8_t *out = msgb_data[i];
			msgb_inuse[i] = 1;
			memset(out, 0, size);
			local_irq_restore(x);
			return out;
		}
	}
	local_irq_restore(x);
	TRACE_ERROR("%s() out of memory!\r\n", __func__);
	return NULL;
}

int _talloc_free(void *ptr, const char *location)
{
	unsigned int i;
	unsigned long x;

	local_irq_save(x);
	for (i = 0; i < ARRAY_SIZE(msgb_inuse); i++) {
		if (ptr == msgb_data[i]) {
			if (!msgb_inuse[i]) {
				TRACE_ERROR("%s: double_free by \r\n", __func__, location);
			} else {
				msgb_inuse[i] = 0;
			}
			local_irq_restore(x);
			return 0;
		}
	}

	local_irq_restore(x);
	TRACE_ERROR("%s: invalid pointer %p from %s\r\n", __func__, ptr, location);
	return -1;
}

void talloc_set_name_const(const void *ptr, const char *name)
{
	/* do nothing */
}

#if 0
void *talloc_named_const(const void *context, size_t size, const char *name)
{
	if (size)
		TRACE_ERROR("%s: called with size!=0 from %s\r\n", __func__, name);
	return NULL;
}

void *talloc_pool(const void *context, size_t size)
{
}
#endif