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From: Jason Wessel on 25 Feb 2010 16:30
Implement kgdb_arch_pc() which adjusts the pc if it needs to be
adjusted after a software breakpoint trap.

Implement kgdb_arch_set_pc() which is a new required function in the
kgdb debug core.

When processing a single step return zero in the error exception field
so that the debug core can distinguish between a single step trap and
a breakpoint trap generically.

Signed-off-by: Jason Wessel <jason.wessel(a)windriver.com>
Acked-by: Paul Mundt <lethal(a)linux-sh.org>
---
arch/sh/kernel/kgdb.c | 14 +++++++++++++-
1 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/arch/sh/kernel/kgdb.c b/arch/sh/kernel/kgdb.c
index 3e532d0..1ec03c9 100644
--- a/arch/sh/kernel/kgdb.c
+++ b/arch/sh/kernel/kgdb.c
@@ -237,6 +237,18 @@ int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
return -1;
}

+unsigned long kgdb_arch_pc(int exception, struct pt_regs *regs)
+{
+ if (exception == 60)
+ return instruction_pointer(regs) - 2;
+ return instruction_pointer(regs);
+}
+
+void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
+{
+ regs->pc = ip;
+}
+
/*
* The primary entry points for the kgdb debug trap table entries.
*/
@@ -247,7 +259,7 @@ BUILD_TRAP_HANDLER(singlestep)

local_irq_save(flags);
regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
- kgdb_handle_exception(vec >> 2, SIGTRAP, 0, regs);
+ kgdb_handle_exception(0, SIGTRAP, 0, regs);
local_irq_restore(flags);
}

--
1.6.4.rc1

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Prev: [PATCH 28/28] debug_core: Turn off tracing while in the debugger
Next: [PATCH 14/28] kgdboc,keyboard: Keyboard driver for kdb with kgdb