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https://github.com/brain-hackers/u-boot-brain
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![Linus Walleij](/assets/img/avatar_default.png)
Now that loading files using semihosting can be done using a command in standard scripts, and we have rewritten the boardfile and added it to the Vexpress64, let's delete the external interface to the semihosting file retrieveal and rely solely on these commands, and staticize them inside that file so the whole business is self-contained. Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
215 lines
4.5 KiB
C
215 lines
4.5 KiB
C
/*
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* Copyright 2014 Broadcom Corporation
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* Minimal semihosting implementation for reading files into memory. If more
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* features like writing files or console output are required they can be
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* added later. This code has been tested on arm64/aarch64 fastmodel only.
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* An untested placeholder exists for armv7 architectures, but since they
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* are commonly available in silicon now, fastmodel usage makes less sense
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* for them.
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*/
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#include <common.h>
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#include <command.h>
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#define SYSOPEN 0x01
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#define SYSCLOSE 0x02
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#define SYSREAD 0x06
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#define SYSFLEN 0x0C
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#define MODE_READ 0x0
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#define MODE_READBIN 0x1
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/*
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* Call the handler
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*/
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static noinline long smh_trap(unsigned int sysnum, void *addr)
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{
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register long result asm("r0");
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#if defined(CONFIG_ARM64)
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asm volatile ("hlt #0xf000" : "=r" (result) : "0"(sysnum), "r"(addr));
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#else
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/* Note - untested placeholder */
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asm volatile ("svc #0x123456" : "=r" (result) : "0"(sysnum), "r"(addr));
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#endif
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return result;
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}
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/*
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* Open a file on the host. Mode is "r" or "rb" currently. Returns a file
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* descriptor or -1 on error.
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*/
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static long smh_open(const char *fname, char *modestr)
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{
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long fd;
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unsigned long mode;
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struct smh_open_s {
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const char *fname;
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unsigned long mode;
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size_t len;
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} open;
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debug("%s: file \'%s\', mode \'%s\'\n", __func__, fname, modestr);
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/* Check the file mode */
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if (!(strcmp(modestr, "r"))) {
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mode = MODE_READ;
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} else if (!(strcmp(modestr, "rb"))) {
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mode = MODE_READBIN;
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} else {
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printf("%s: ERROR mode \'%s\' not supported\n", __func__,
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modestr);
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return -1;
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}
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open.fname = fname;
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open.len = strlen(fname);
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open.mode = mode;
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/* Open the file on the host */
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fd = smh_trap(SYSOPEN, &open);
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if (fd == -1)
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printf("%s: ERROR fd %ld for file \'%s\'\n", __func__, fd,
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fname);
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return fd;
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}
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/*
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* Read 'len' bytes of file into 'memp'. Returns 0 on success, else failure
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*/
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static long smh_read(long fd, void *memp, size_t len)
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{
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long ret;
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struct smh_read_s {
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long fd;
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void *memp;
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size_t len;
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} read;
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debug("%s: fd %ld, memp %p, len %lu\n", __func__, fd, memp, len);
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read.fd = fd;
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read.memp = memp;
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read.len = len;
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ret = smh_trap(SYSREAD, &read);
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if (ret < 0) {
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/*
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* The ARM handler allows for returning partial lengths,
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* but in practice this never happens so rather than create
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* hard to maintain partial read loops and such, just fail
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* with an error message.
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*/
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printf("%s: ERROR ret %ld, fd %ld, len %lu memp %p\n",
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__func__, ret, fd, len, memp);
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return -1;
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}
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return 0;
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}
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/*
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* Close the file using the file descriptor
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*/
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static long smh_close(long fd)
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{
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long ret;
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debug("%s: fd %ld\n", __func__, fd);
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ret = smh_trap(SYSCLOSE, &fd);
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if (ret == -1)
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printf("%s: ERROR fd %ld\n", __func__, fd);
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return ret;
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}
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/*
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* Get the file length from the file descriptor
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*/
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static long smh_len_fd(long fd)
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{
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long ret;
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debug("%s: fd %ld\n", __func__, fd);
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ret = smh_trap(SYSFLEN, &fd);
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if (ret == -1)
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printf("%s: ERROR ret %ld, fd %ld\n", __func__, ret, fd);
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return ret;
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}
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static int smh_load_file(const char * const name, ulong load_addr,
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ulong *end_addr)
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{
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long fd;
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long len;
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long ret;
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fd = smh_open(name, "rb");
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if (fd == -1)
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return -1;
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len = smh_len_fd(fd);
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if (len < 0) {
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smh_close(fd);
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return -1;
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}
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ret = smh_read(fd, (void *)load_addr, len);
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smh_close(fd);
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if (ret == 0) {
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*end_addr = load_addr + len - 1;
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printf("loaded file %s from %08lX to %08lX, %08lX bytes\n",
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name,
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load_addr,
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*end_addr,
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len);
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} else {
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printf("read failed\n");
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return 0;
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}
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return 0;
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}
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static int do_smhload(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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if (argc == 3 || argc == 4) {
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ulong load_addr;
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ulong end_addr = 0;
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ulong ret;
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char end_str[64];
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load_addr = simple_strtoul(argv[2], NULL, 16);
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if (!load_addr)
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return -1;
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ret = smh_load_file(argv[1], load_addr, &end_addr);
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if (ret < 0)
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return 1;
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/* Optionally save returned end to the environment */
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if (argc == 4) {
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sprintf(end_str, "0x%08lx", end_addr);
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setenv(argv[3], end_str);
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}
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} else {
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return CMD_RET_USAGE;
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}
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return 0;
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}
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U_BOOT_CMD(smhload, 4, 0, do_smhload, "load a file using semihosting",
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"<file> 0x<address> [end var]\n"
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" - load a semihosted file to the address specified\n"
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" if the optional [end var] is specified, the end\n"
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" address of the file will be stored in this environment\n"
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" variable.\n");
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