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![Linus Walleij](/assets/img/avatar_default.png)
By rearranging the functions in the semihosting code we can avoid forward-declaration of the internal static functions. This puts the stuff in a logical order: read/open/close/len and then higher-order functions follow at the end. Cc: Darwin Rambo <drambo@broadcom.com> Cc: AKASHI Takahiro <takahiro.akashi@linaro.org> Cc: Mark Hambleton <mark.hambleton@arm.com> Cc: Tom Rini <trini@ti.com> Acked-by: Steve Rae <srae@broadcom.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
237 lines
4.8 KiB
C
237 lines
4.8 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 <asm/semihosting.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 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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/*
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* Open, load a file into memory, and close it. Check that the available space
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* is sufficient to store the entire file. Return the bytes actually read from
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* the file as seen by the read function. The verbose flag enables some extra
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* printing of successful read status.
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*/
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int smh_load(const char *fname, void *memp, int avail, int verbose)
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{
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long ret;
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long fd;
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size_t len;
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ret = -1;
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debug("%s: fname \'%s\', avail %u, memp %p\n", __func__, fname,
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avail, memp);
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/* Open the file */
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fd = smh_open(fname, "rb");
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if (fd == -1)
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return -1;
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/* Get the file length */
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ret = smh_len_fd(fd);
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if (ret == -1) {
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smh_close(fd);
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return -1;
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}
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/* Check that the file will fit in the supplied buffer */
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if (ret > avail) {
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printf("%s: ERROR ret %ld, avail %u\n", __func__, ret,
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avail);
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smh_close(fd);
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return -1;
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}
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len = ret;
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/* Read the file into the buffer */
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ret = smh_read(fd, memp, len);
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if (ret == 0) {
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/* Print successful load information if requested */
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if (verbose) {
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printf("\n%s\n", fname);
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printf(" 0x%8p dest\n", memp);
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printf(" 0x%08lx size\n", len);
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printf(" 0x%08x avail\n", avail);
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}
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}
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/* Close the file */
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smh_close(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 filename
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*/
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long smh_len(const char *fname)
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{
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long ret;
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long fd;
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long len;
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debug("%s: file \'%s\'\n", __func__, fname);
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/* Open the file */
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fd = smh_open(fname, "rb");
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if (fd < 0)
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return fd;
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/* Get the file length */
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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 len;
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}
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/* Close the file */
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ret = smh_close(fd);
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if (ret < 0)
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return ret;
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debug("%s: returning len %ld\n", __func__, len);
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/* Return the file length (or -1 error indication) */
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return len;
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}
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