Prior to the arch/ppc -> arch/powerpc transition, xmon had support for single
stepping on 4xx boards. The functionality was lost when arch/ppc was removed.
This patch restores single step support for 44x boards, and Book-E in general.
Signed-off-by: Josh Boyer <jwbo...@linux.vnet.ibm.com>
---
arch/powerpc/xmon/xmon.c | 20 +++++++++++++++++++-
1 files changed, 19 insertions(+), 1 deletions(-)
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index c6f0a71..bdbe96c 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -517,6 +517,15 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
in_xmon = 0;
#endif
+#ifdef CONFIG_BOOKE
+ if (regs->msr & MSR_DE) {
+ bp = at_breakpoint(regs->nip);
+ if (bp != NULL) {
+ regs->nip = (unsigned long) &bp->instr[0];
+ atomic_inc(&bp->ref_count);
+ }
+ }
+#else
if ((regs->msr & (MSR_IR|MSR_PR|MSR_SF)) == (MSR_IR|MSR_SF)) {
bp = at_breakpoint(regs->nip);
if (bp != NULL) {
@@ -530,7 +539,7 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
}
}
}
-
+#endif
insert_cpu_bpts();
local_irq_restore(flags);
@@ -894,6 +903,14 @@ cmds(struct pt_regs *excp)
}
}
+#ifdef CONFIG_BOOKE
+static int do_step(struct pt_regs *regs)
+{
+ regs->msr |= MSR_DE;
+ mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
+ return 1;
+}
+#else
/*
* Step a single instruction.
* Some instructions we emulate, others we execute with MSR_SE set.
@@ -924,6 +941,7 @@ static int do_step(struct pt_regs *regs)
regs->msr |= MSR_SE;
return 1;
}
+#endif
static void bootcmds(void)
{
--
1.5.5.6
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev
