* Copyright (C) 2009 by Marvell Technology Group Ltd. *
* Written by Nicolas Pitre <nico@marvell.com> *
* *
+ * Copyright (C) 2010 by Spencer Oliver *
+ * spen@spen-soft.co.uk *
+ * *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
#include "config.h"
#endif
+#include "arm.h"
#include "armv4_5.h"
+#include "arm7_9_common.h"
+#include "armv7m.h"
+#include "cortex_m.h"
#include "register.h"
#include "arm_semihosting.h"
#include <helper/binarybuffer.h>
#include <helper/log.h>
+#include <sys/stat.h>
+static int open_modeflags[12] = {
+ O_RDONLY,
+ O_RDONLY | O_BINARY,
+ O_RDWR,
+ O_RDWR | O_BINARY,
+ O_WRONLY | O_CREAT | O_TRUNC,
+ O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
+ O_RDWR | O_CREAT | O_TRUNC,
+ O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
+ O_WRONLY | O_CREAT | O_APPEND,
+ O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
+ O_RDWR | O_CREAT | O_APPEND,
+ O_RDWR | O_CREAT | O_APPEND | O_BINARY
+};
static int do_semihosting(struct target *target)
{
- struct arm *armv4_5 = target_to_armv4_5(target);
- uint32_t r0 = buf_get_u32(armv4_5->core_cache->reg_list[0].value, 0, 32);
- uint32_t r1 = buf_get_u32(armv4_5->core_cache->reg_list[1].value, 0, 32);
- uint32_t lr = buf_get_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, ARMV4_5_MODE_SVC, 14).value, 0, 32);
- uint32_t spsr = buf_get_u32(armv4_5->spsr->value, 0, 32);;
+ struct arm *arm = target_to_arm(target);
+ uint32_t r0 = buf_get_u32(arm->core_cache->reg_list[0].value, 0, 32);
+ uint32_t r1 = buf_get_u32(arm->core_cache->reg_list[1].value, 0, 32);
uint8_t params[16];
int retval, result;
* - no validation on target provided file descriptors
* - no safety checks on opened/deleted/renamed file paths
* Beware the target app you use this support with.
+ *
+ * TODO: explore mapping requests to GDB's "File-I/O Remote
+ * Protocol Extension" ... when GDB is active.
*/
switch (r0) {
case 0x01: /* SYS_OPEN */
uint32_t l = target_buffer_get_u32(target, params+8);
if (l <= 255 && m <= 11) {
uint8_t fn[256];
- int mode;
retval = target_read_memory(target, a, 1, l, fn);
if (retval != ERROR_OK)
return retval;
fn[l] = 0;
- if (m & 0x2)
- mode = O_RDWR;
- else if (m & 0xc)
- mode = O_WRONLY;
- else
- mode = O_RDONLY;
- if (m >= 8)
- mode |= O_CREAT|O_APPEND;
- else if (m >= 4)
- mode |= O_CREAT|O_TRUNC;
if (strcmp((char *)fn, ":tt") == 0) {
- if ((mode & 3) == 0)
- result = dup(0);
+ if (m < 4)
+ result = dup(STDIN_FILENO);
else
- result = dup(1);
- } else
- result = open((char *)fn, mode);
- armv4_5->semihosting_errno = errno;
+ result = dup(STDOUT_FILENO);
+ } else {
+ /* cygwin requires the permission setting
+ * otherwise it will fail to reopen a previously
+ * written file */
+ result = open((char *)fn, open_modeflags[m], 0644);
+ }
+ arm->semihosting_errno = errno;
} else {
result = -1;
- armv4_5->semihosting_errno = EINVAL;
+ arm->semihosting_errno = EINVAL;
}
}
break;
else {
int fd = target_buffer_get_u32(target, params+0);
result = close(fd);
- armv4_5->semihosting_errno = errno;
+ arm->semihosting_errno = errno;
}
break;
case 0x04: /* SYS_WRITE0 */
do {
unsigned char c;
- retval = target_read_memory(target, r1, 1, 1, &c);
+ retval = target_read_memory(target, r1++, 1, 1, &c);
if (retval != ERROR_OK)
return retval;
if (!c)
uint8_t *buf = malloc(l);
if (!buf) {
result = -1;
- armv4_5->semihosting_errno = ENOMEM;
+ arm->semihosting_errno = ENOMEM;
} else {
retval = target_read_buffer(target, a, l, buf);
if (retval != ERROR_OK) {
return retval;
}
result = write(fd, buf, l);
- armv4_5->semihosting_errno = errno;
+ arm->semihosting_errno = errno;
if (result >= 0)
result = l - result;
free(buf);
uint8_t *buf = malloc(l);
if (!buf) {
result = -1;
- armv4_5->semihosting_errno = ENOMEM;
+ arm->semihosting_errno = ENOMEM;
} else {
result = read(fd, buf, l);
- armv4_5->semihosting_errno = errno;
- if (result > 0) {
+ arm->semihosting_errno = errno;
+ if (result >= 0) {
retval = target_write_buffer(target, a, result, buf);
if (retval != ERROR_OK) {
free(buf);
int fd = target_buffer_get_u32(target, params+0);
off_t pos = target_buffer_get_u32(target, params+4);
result = lseek(fd, pos, SEEK_SET);
- armv4_5->semihosting_errno = errno;
+ arm->semihosting_errno = errno;
if (result == pos)
result = 0;
}
return retval;
else {
int fd = target_buffer_get_u32(target, params+0);
- off_t cur = lseek(fd, 0, SEEK_CUR);
- if (cur == (off_t)-1) {
- armv4_5->semihosting_errno = errno;
+ struct stat buf;
+ result = fstat(fd, &buf);
+ if (result == -1) {
+ arm->semihosting_errno = errno;
result = -1;
break;
}
- result = lseek(fd, 0, SEEK_END);
- armv4_5->semihosting_errno = errno;
- if (lseek(fd, cur, SEEK_SET) == (off_t)-1) {
- armv4_5->semihosting_errno = errno;
- result = -1;
- }
+ result = buf.st_size;
}
break;
return retval;
fn[l] = 0;
result = remove((char *)fn);
- armv4_5->semihosting_errno = errno;
+ arm->semihosting_errno = errno;
} else {
result = -1;
- armv4_5->semihosting_errno = EINVAL;
+ arm->semihosting_errno = EINVAL;
}
}
break;
fn1[l1] = 0;
fn2[l2] = 0;
result = rename((char *)fn1, (char *)fn2);
- armv4_5->semihosting_errno = errno;
+ arm->semihosting_errno = errno;
} else {
result = -1;
- armv4_5->semihosting_errno = EINVAL;
+ arm->semihosting_errno = EINVAL;
}
}
break;
break;
case 0x13: /* SYS_ERRNO */
- result = armv4_5->semihosting_errno;
+ result = arm->semihosting_errno;
break;
case 0x15: /* SYS_GET_CMDLINE */
if (l < s)
result = -1;
else {
- retval = target_write_buffer(target, a, s, (void*)arg);
+ retval = target_write_buffer(target, a, s, (void *)arg);
if (retval != ERROR_OK)
return retval;
result = 0;
fprintf(stderr, "semihosting: unsupported call %#x\n",
(unsigned) r0);
result = -1;
- armv4_5->semihosting_errno = ENOTSUP;
+ arm->semihosting_errno = ENOTSUP;
}
/* resume execution to the original mode */
- buf_set_u32(armv4_5->core_cache->reg_list[0].value, 0, 32, result);
- armv4_5->core_cache->reg_list[0].dirty = 1;
- buf_set_u32(armv4_5->core_cache->reg_list[15].value, 0, 32, lr);
- armv4_5->core_cache->reg_list[15].dirty = 1;
- buf_set_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32, spsr);
- armv4_5->core_cache->reg_list[ARMV4_5_CPSR].dirty = 1;
- armv4_5->core_mode = spsr & 0x1f;
- if (spsr & 0x20)
- armv4_5->core_state = ARMV4_5_STATE_THUMB;
+
+ /* REVISIT this looks wrong ... ARM11 and Cortex-A8
+ * should work this way at least sometimes.
+ */
+ if (is_arm7_9(target_to_arm7_9(target))) {
+ uint32_t spsr;
+
+ /* return value in R0 */
+ buf_set_u32(arm->core_cache->reg_list[0].value, 0, 32, result);
+ arm->core_cache->reg_list[0].dirty = 1;
+
+ /* LR --> PC */
+ buf_set_u32(arm->core_cache->reg_list[15].value, 0, 32,
+ buf_get_u32(arm_reg_current(arm, 14)->value, 0, 32));
+ arm->core_cache->reg_list[15].dirty = 1;
+
+ /* saved PSR --> current PSR */
+ spsr = buf_get_u32(arm->spsr->value, 0, 32);
+
+ /* REVISIT should this be arm_set_cpsr(arm, spsr)
+ * instead of a partially unrolled version?
+ */
+
+ buf_set_u32(arm->cpsr->value, 0, 32, spsr);
+ arm->cpsr->dirty = 1;
+ arm->core_mode = spsr & 0x1f;
+ if (spsr & 0x20)
+ arm->core_state = ARM_STATE_THUMB;
+
+ } else {
+ /* resume execution, this will be pc+2 to skip over the
+ * bkpt instruction */
+
+ /* return result in R0 */
+ buf_set_u32(arm->core_cache->reg_list[0].value, 0, 32, result);
+ arm->core_cache->reg_list[0].dirty = 1;
+ }
+
return target_resume(target, 1, 0, 0, 0);
}
* or an error was encountered, in which case the caller must return
* immediately.
*
- * @param target Pointer to the ARM target to process
+ * @param target Pointer to the ARM target to process. This target must
+ * not represent an ARMv6-M or ARMv7-M processor.
* @param retval Pointer to a location where the return code will be stored
* @return non-zero value if a request was processed or an error encountered
*/
int arm_semihosting(struct target *target, int *retval)
{
- struct arm *armv4_5 = target_to_armv4_5(target);
- uint32_t lr, spsr;
+ struct arm *arm = target_to_arm(target);
+ uint32_t pc, lr, spsr;
+ struct reg *r;
- if (!armv4_5->is_semihosting ||
- armv4_5->core_mode != ARMV4_5_MODE_SVC ||
- buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32) != 0x08)
+ if (!arm->is_semihosting)
return 0;
- lr = buf_get_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, ARMV4_5_MODE_SVC, 14).value, 0, 32);
- spsr = buf_get_u32(armv4_5->spsr->value, 0, 32);
+ if (is_arm7_9(target_to_arm7_9(target))) {
+ if (arm->core_mode != ARM_MODE_SVC)
+ return 0;
- /* check instruction that triggered this trap */
- if (spsr & (1 << 5)) {
- /* was in Thumb mode */
- uint8_t insn_buf[2];
- uint16_t insn;
- *retval = target_read_memory(target, lr-2, 2, 1, insn_buf);
- if (*retval != ERROR_OK)
+ /* Check for PC == 0x00000008 or 0xffff0008: Supervisor Call vector. */
+ r = arm->pc;
+ pc = buf_get_u32(r->value, 0, 32);
+ if (pc != 0x00000008 && pc != 0xffff0008)
+ return 0;
+
+ r = arm_reg_current(arm, 14);
+ lr = buf_get_u32(r->value, 0, 32);
+
+ /* Core-specific code should make sure SPSR is retrieved
+ * when the above checks pass...
+ */
+ if (!arm->spsr->valid) {
+ LOG_ERROR("SPSR not valid!");
+ *retval = ERROR_FAIL;
return 1;
- insn = target_buffer_get_u16(target, insn_buf);
- if (insn != 0xDFAB)
+ }
+
+ spsr = buf_get_u32(arm->spsr->value, 0, 32);
+
+ /* check instruction that triggered this trap */
+ if (spsr & (1 << 5)) {
+ /* was in Thumb (or ThumbEE) mode */
+ uint8_t insn_buf[2];
+ uint16_t insn;
+
+ *retval = target_read_memory(target, lr-2, 2, 1, insn_buf);
+ if (*retval != ERROR_OK)
+ return 1;
+ insn = target_buffer_get_u16(target, insn_buf);
+
+ /* SVC 0xab */
+ if (insn != 0xDFAB)
+ return 0;
+ } else if (spsr & (1 << 24)) {
+ /* was in Jazelle mode */
return 0;
- } else {
- /* was in ARM mode */
- uint8_t insn_buf[4];
- uint32_t insn;
- *retval = target_read_memory(target, lr-4, 4, 1, insn_buf);
+ } else {
+ /* was in ARM mode */
+ uint8_t insn_buf[4];
+ uint32_t insn;
+
+ *retval = target_read_memory(target, lr-4, 4, 1, insn_buf);
+ if (*retval != ERROR_OK)
+ return 1;
+ insn = target_buffer_get_u32(target, insn_buf);
+
+ /* SVC 0x123456 */
+ if (insn != 0xEF123456)
+ return 0;
+ }
+ } else if (is_armv7m(target_to_armv7m(target))) {
+ uint16_t insn;
+
+ if (target->debug_reason != DBG_REASON_BREAKPOINT)
+ return 0;
+
+ r = arm->pc;
+ pc = buf_get_u32(r->value, 0, 32);
+
+ pc &= ~1;
+ *retval = target_read_u16(target, pc, &insn);
if (*retval != ERROR_OK)
return 1;
- insn = target_buffer_get_u32(target, insn_buf);
- if (insn != 0xEF123456)
+
+ /* bkpt 0xAB */
+ if (insn != 0xBEAB)
return 0;
+ } else {
+ LOG_ERROR("Unsupported semi-hosting Target");
+ return 0;
}
*retval = do_semihosting(target);
Code Review / openocd.git / blobdiff