From cdd3904dcc56d9d24ef86be897e421d3cc364226 Mon Sep 17 00:00:00 2001 From: Josh Boyer Date: Mon, 5 Oct 2009 04:46:05 +0000 Subject: [PATCH] powerpc/booke: Fix xmon single step on PowerPC Book-E 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 Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/xmon/xmon.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index c6f0a71b..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) { -- 2.7.4