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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 <jwboyer@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Josh Boyer 2009-10-05 04:46:05 +00:00 committed by Benjamin Herrenschmidt
parent 348aa30300
commit cdd3904dcc
1 changed files with 19 additions and 1 deletions
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20
arch/powerpc/xmon/xmon.c
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@ -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)
{