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David Brownell <david-b@pacbell.net> Tweak disassembly commands: 

For ARMv4/ARMv5:
  - better command parameter error checking
  - don't require an instruction count; default to one
  - recognize thumb function addresses
  - make function static
  - shorten some too-long lines
 For Cortex-M3:
  - don't require an instruction count; default to one

With the relevant doc updates.
---
Nyet done:  invoke the thumb2 disassembler on v4/v5,
to better handle branch instructions.

git-svn-id: svn://svn.berlios.de/openocd/trunk@2624 b42882b7-edfa-0310-969c-e2dbd0fdcd60
This commit is contained in:
oharboe 2009-08-25 20:02:19 +00:00
parent 24f011ebb4
commit bc075606b7
3 changed files with 61 additions and 31 deletions
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9
doc/openocd.texi
View File

@ -4612,10 +4612,12 @@ The target may later be resumed in the currently set core_state.
that is not currently supported in OpenOCD.)
@end deffn
@deffn Command {armv4_5 disassemble} address count [thumb]
@deffn Command {armv4_5 disassemble} address [count [@option{thumb}]]
@cindex disassemble
Disassembles @var{count} instructions starting at @var{address}.
If @option{thumb} is specified, Thumb (16-bit) instructions are used;
If @var{count} is not specified, a single instruction is disassembled.
If @option{thumb} is specified, or the low bit of the address is set,
Thumb (16-bit) instructions are used;
else ARM (32-bit) instructions are used.
(Processors may also support the Jazelle state, but
those instructions are not currently understood by OpenOCD.)
@ -5086,9 +5088,10 @@ If @var{value} is defined, first assigns that.
@subsection Cortex-M3 specific commands
@cindex Cortex-M3
@deffn Command {cortex_m3 disassemble} address count
@deffn Command {cortex_m3 disassemble} address [count]
@cindex disassemble
Disassembles @var{count} Thumb2 instructions starting at @var{address}.
If @var{count} is not specified, a single instruction is disassembled.
@end deffn
@deffn Command {cortex_m3 maskisr} (@option{on}|@option{off})

55
src/target/armv4_5.c
View File

@ -387,13 +387,15 @@ int handle_armv4_5_core_state_command(struct command_context_s *cmd_ctx, char *c
return ERROR_OK;
}
int handle_armv4_5_disassemble_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
static int
handle_armv4_5_disassemble_command(struct command_context_s *cmd_ctx,
char *cmd, char **args, int argc)
{
int retval = ERROR_OK;
target_t *target = get_current_target(cmd_ctx);
armv4_5_common_t *armv4_5 = target->arch_info;
uint32_t address;
int count;
int count = 1;
int i;
arm_instruction_t cur_instruction;
uint32_t opcode;
@ -406,19 +408,32 @@ int handle_armv4_5_disassemble_command(struct command_context_s *cmd_ctx, char *
return ERROR_OK;
}
if (argc < 2)
{
command_print(cmd_ctx, "usage: armv4_5 disassemble <address> <count> ['thumb']");
switch (argc) {
case 3:
if (strcmp(args[2], "thumb") != 0)
goto usage;
thumb = 1;
/* FALL THROUGH */
case 2:
count = strtoul(args[1], NULL, 0);
/* FALL THROUGH */
case 1:
address = strtoul(args[0], NULL, 0);
if (address & 0x01) {
if (!thumb) {
command_print(cmd_ctx, "Disassemble as Thumb");
thumb = 1;
}
address &= ~1;
}
break;
default:
usage:
command_print(cmd_ctx,
"usage: armv4_5 disassemble <address> [<count> ['thumb']]");
return ERROR_OK;
}
address = strtoul(args[0], NULL, 0);
count = strtoul(args[1], NULL, 0);
if (argc >= 3)
if (strcmp(args[2], "thumb") == 0)
thumb = 1;
for (i = 0; i < count; i++)
{
if (thumb)
@ -453,12 +468,20 @@ int armv4_5_register_commands(struct command_context_s *cmd_ctx)
{
command_t *armv4_5_cmd;
armv4_5_cmd = register_command(cmd_ctx, NULL, "armv4_5", NULL, COMMAND_ANY, "armv4/5 specific commands");
armv4_5_cmd = register_command(cmd_ctx, NULL, "armv4_5",
NULL, COMMAND_ANY,
"armv4/5 specific commands");
register_command(cmd_ctx, armv4_5_cmd, "reg", handle_armv4_5_reg_command, COMMAND_EXEC, "display ARM core registers");
register_command(cmd_ctx, armv4_5_cmd, "core_state", handle_armv4_5_core_state_command, COMMAND_EXEC, "display/change ARM core state <arm | thumb>");
register_command(cmd_ctx, armv4_5_cmd, "reg",
handle_armv4_5_reg_command, COMMAND_EXEC,
"display ARM core registers");
register_command(cmd_ctx, armv4_5_cmd, "core_state",
handle_armv4_5_core_state_command, COMMAND_EXEC,
"display/change ARM core state <arm | thumb>");
register_command(cmd_ctx, armv4_5_cmd, "disassemble",
handle_armv4_5_disassemble_command, COMMAND_EXEC,
"disassemble instructions <address> [<count> ['thumb']]");
register_command(cmd_ctx, armv4_5_cmd, "disassemble", handle_armv4_5_disassemble_command, COMMAND_EXEC, "disassemble instructions <address> <count> ['thumb']");
return ERROR_OK;
}

26
src/target/cortex_m3.c
View File

@ -1702,22 +1702,26 @@ handle_cortex_m3_disassemble_command(struct command_context_s *cmd_ctx,
int retval = ERROR_OK;
target_t *target = get_current_target(cmd_ctx);
uint32_t address;
unsigned long count;
unsigned long count = 1;
arm_instruction_t cur_instruction;
if (argc != 2) {
command_print(cmd_ctx,
"usage: cortex_m3 disassemble <address> <count>");
return ERROR_OK;
}
errno = 0;
address = strtoul(args[0], NULL, 0);
if (errno)
return ERROR_FAIL;
switch (argc) {
case 2:
count = strtoul(args[1], NULL, 0);
if (errno)
return ERROR_FAIL;
/* FALL THROUGH */
case 1:
address = strtoul(args[0], NULL, 0);
if (errno)
return ERROR_FAIL;
break;
default:
command_print(cmd_ctx,
"usage: cortex_m3 disassemble <address> [<count>]");
return ERROR_OK;
}
while (count--) {
retval = thumb2_opcode(target, address, &cur_instruction);
@ -1809,7 +1813,7 @@ int cortex_m3_register_commands(struct command_context_s *cmd_ctx)
register_command(cmd_ctx, cortex_m3_cmd, "disassemble",
handle_cortex_m3_disassemble_command, COMMAND_EXEC,
"disassemble Thumb2 instructions <address> <count>");
"disassemble Thumb2 instructions <address> [<count>]");
register_command(cmd_ctx, cortex_m3_cmd, "maskisr",
handle_cortex_m3_mask_interrupts_command, COMMAND_EXEC,
"mask cortex_m3 interrupts ['on'|'off']");