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authorDavid Howells <dhowells@redhat.com>2011-03-18 16:54:29 +0000
committerDavid Howells <dhowells@redhat.com>2011-03-18 16:54:29 +0000
commit9ee21723ccc30070f47c411826d4ed013cd050c2 (patch)
tree5f460e51e72ef93f4103c39032f1aec298a638db /arch/mn10300/kernel
parentddb7d1e975d224885397c002512ded987be3c3bc (diff)
MN10300: gdbstub: Restrict single-stepping to non-preemptable non-SMP configs
Restrict single-stepping through the kernel using gdbstub to non-preemptable non-SMP configs as gdbstub has to do software single-stepping by means of temporary breakpoints. Hardware single-stepping is unavailable as Panasonic have not sufficiently documented the interface to it. Software single-stepping through preemptable or SMP kernels runs into problems as it makes it much more likely that the wrong thread will hit the temporary breakpoints. It seems impractical to work around the problem for the most part. It could be possible to make a UP preemptable kernel switch temporary breakpoints in and out in switch_to(). Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'arch/mn10300/kernel')
-rw-r--r--arch/mn10300/kernel/gdb-stub.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/mn10300/kernel/gdb-stub.c b/arch/mn10300/kernel/gdb-stub.c
index b169d99d9f20..a9c1e916687f 100644
--- a/arch/mn10300/kernel/gdb-stub.c
+++ b/arch/mn10300/kernel/gdb-stub.c
@@ -405,6 +405,7 @@ static int hexToInt(char **ptr, int *intValue)
return (numChars);
}
+#ifdef CONFIG_GDBSTUB_ALLOW_SINGLE_STEP
/*
* We single-step by setting breakpoints. When an exception
* is handled, we need to restore the instructions hoisted
@@ -729,6 +730,7 @@ static int gdbstub_single_step(struct pt_regs *regs)
__gdbstub_restore_bp();
return -EFAULT;
}
+#endif /* CONFIG_GDBSTUB_ALLOW_SINGLE_STEP */
#ifdef CONFIG_GDBSTUB_CONSOLE
@@ -1208,11 +1210,13 @@ static int gdbstub(struct pt_regs *regs, enum exception_code excep)
/* if we were single stepping, restore the opcodes hoisted for the
* breakpoint[s] */
broke = 0;
+#ifdef CONFIG_GDBSTUB_ALLOW_SINGLE_STEP
if ((step_bp[0].addr && step_bp[0].addr == (u8 *) regs->pc) ||
(step_bp[1].addr && step_bp[1].addr == (u8 *) regs->pc))
broke = 1;
__gdbstub_restore_bp();
+#endif
if (gdbstub_rx_unget) {
sigval = SIGINT;
@@ -1548,17 +1552,21 @@ packet_waiting:
* Step to next instruction
*/
case 's':
- /*
- * using the T flag doesn't seem to perform single
+ /* Using the T flag doesn't seem to perform single
* stepping (it seems to wind up being caught by the
* JTAG unit), so we have to use breakpoints and
* continue instead.
*/
+#ifdef CONFIG_GDBSTUB_ALLOW_SINGLE_STEP
if (gdbstub_single_step(regs) < 0)
/* ignore any fault error for now */
gdbstub_printk("unable to set single-step"
" bp\n");
goto done;
+#else
+ gdbstub_strcpy(output_buffer, "E01");
+ break;
+#endif
/*
* Set baud rate (bBB)