sandbox: Add a new header for the system malloc()

Some files use U-Boot headers but still need to access the system
malloc(). Allow this by creating a new asm/malloc.h which can be used so
long as U-Boot's malloc.h has not been included.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/sandbox/cpu/start.c

@@ -8,10 +8,10 @@
 #include <errno.h>
 #include <os.h>
 #include <cli.h>
-#include <malloc.h>
 #include <sort.h>
 #include <asm/getopt.h>
 #include <asm/io.h>
+#include <asm/malloc.h>
 #include <asm/sections.h>
 #include <asm/state.h>
 #include <linux/ctype.h>
@@ -181,7 +181,7 @@ static int sandbox_cmdline_cb_default_fdt(struct sandbox_state *state,
 	int len;
 
 	len = strlen(state->argv[0]) + strlen(fmt) + 1;
-	fname = os_malloc(len);
+	fname = malloc(len);
 	if (!fname)
 		return -ENOMEM;
 	snprintf(fname, len, fmt, state->argv[0]);
@@ -201,7 +201,7 @@ static int sandbox_cmdline_cb_test_fdt(struct sandbox_state *state,
 	int len;
 
 	len = strlen(state->argv[0]) + strlen(fmt) + 1;
-	fname = os_malloc(len);
+	fname = malloc(len);
 	if (!fname)
 		return -ENOMEM;
 	strcpy(fname, state->argv[0]);

arch/sandbox/cpu/state.c

@@ -7,6 +7,7 @@
 #include <errno.h>
 #include <fdtdec.h>
 #include <os.h>
+#include <asm/malloc.h>
 #include <asm/state.h>
 
 /* Main state record for the sandbox */
@@ -27,17 +28,17 @@ static int state_ensure_space(int extra_size)
 		return 0;
 
 	size = used + extra_size;
-	buf = os_malloc(size);
+	buf = malloc(size);
 	if (!buf)
 		return -ENOMEM;
 
 	ret = fdt_open_into(blob, buf, size);
 	if (ret) {
-		os_free(buf);
+		free(buf);
 		return -EIO;
 	}
 
-	os_free(blob);
+	free(blob);
 	state->state_fdt = buf;
 	return 0;
 }
@@ -53,7 +54,7 @@ static int state_read_file(struct sandbox_state *state, const char *fname)
 		printf("Cannot find sandbox state file '%s'\n", fname);
 		return -ENOENT;
 	}
-	state->state_fdt = os_malloc(size);
+	state->state_fdt = malloc(size);
 	if (!state->state_fdt) {
 		puts("No memory to read sandbox state\n");
 		return -ENOMEM;
@@ -75,7 +76,7 @@ static int state_read_file(struct sandbox_state *state, const char *fname)
 err_read:
 	os_close(fd);
 err_open:
-	os_free(state->state_fdt);
+	free(state->state_fdt);
 	state->state_fdt = NULL;
 
 	return ret;
@@ -242,7 +243,7 @@ int sandbox_write_state(struct sandbox_state *state, const char *fname)
 	/* Create a state FDT if we don't have one */
 	if (!state->state_fdt) {
 		size = 0x4000;
-		state->state_fdt = os_malloc(size);
+		state->state_fdt = malloc(size);
 		if (!state->state_fdt) {
 			puts("No memory to create FDT\n");
 			return -ENOMEM;
@@ -300,7 +301,7 @@ int sandbox_write_state(struct sandbox_state *state, const char *fname)
 err_write:
 	os_close(fd);
 err_create:
-	os_free(state->state_fdt);
+	free(state->state_fdt);
 
 	return ret;
 }
@@ -418,7 +419,7 @@ int state_uninit(void)
 		os_unlink(state->jumped_fname);
 
 	if (state->state_fdt)
-		os_free(state->state_fdt);
+		free(state->state_fdt);
 	memset(state, '\0', sizeof(*state));
 
 	return 0;

arch/sandbox/include/asm/malloc.h

@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Sandbox access to system malloc (i.e. not U-Boot's)
+ *
+ * Copyright 2020 Google LLC
+ */
+
+#ifndef __ASM_MALLOC_H
+
+void *malloc(size_t size);
+void free(void *ptr);
+void *calloc(size_t nmemb, size_t size);
+void *realloc(void *ptr, size_t size);
+void *reallocarray(void *ptr, size_t nmemb, size_t size);
+
+/*
+ * This header allows calling the system allocation routines. It makes no
+ * sense to also include U-Boot's malloc.h since that redfines malloc to
+ * have a 'dl' prefix. These two implementations cannot be mixed and matched
+ * in the same file.
+ */
+#ifdef __MALLOC_H__
+#error "This sandbox header file cannot be included with malloc.h"
+#endif
+
+#endif