xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc: Hardware breakpoints rewrite to handle non DABR breakpoint registers

Browse Source 
This is a rewrite so that we don't assume we are using the DABR throughout the
code.  We now use the arch_hw_breakpoint to store the breakpoint in a generic
manner in the thread_struct, rather than storing the raw DABR value.

The ptrace GET/SET_DEBUGREG interface currently passes the raw DABR in from
userspace.  We keep this functionality, so that future changes (like the POWER8
DAWR), will still fake the DABR to userspace.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Neuling
2012-12-20 14:06:44 +00:00
committed by Benjamin Herrenschmidt
parent a8190a59e7
commit 9422de3e95
14 changed files with 187 additions and 129 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
arch/powerpc/include/asm/debug.h
View File

@@ -4,6 +4,8 @@
#ifndef _ASM_POWERPC_DEBUG_H
#define _ASM_POWERPC_DEBUG_H
#include <asm/hw_breakpoint.h>
struct pt_regs;
extern struct dentry *powerpc_debugfs_root;
@@ -15,7 +17,7 @@ extern int (*__debugger_ipi)(struct pt_regs *regs);
extern int (*__debugger_bpt)(struct pt_regs *regs);
extern int (*__debugger_sstep)(struct pt_regs *regs);
extern int (*__debugger_iabr_match)(struct pt_regs *regs);
extern int (*__debugger_dabr_match)(struct pt_regs *regs);
extern int (*__debugger_break_match)(struct pt_regs *regs);
extern int (*__debugger_fault_handler)(struct pt_regs *regs);
#define DEBUGGER_BOILERPLATE(__NAME) \
@@ -31,7 +33,7 @@ DEBUGGER_BOILERPLATE(debugger_ipi)
DEBUGGER_BOILERPLATE(debugger_bpt)
DEBUGGER_BOILERPLATE(debugger_sstep)
DEBUGGER_BOILERPLATE(debugger_iabr_match)
DEBUGGER_BOILERPLATE(debugger_dabr_match)
DEBUGGER_BOILERPLATE(debugger_break_match)
DEBUGGER_BOILERPLATE(debugger_fault_handler)
#else
@@ -40,17 +42,18 @@ static inline int debugger_ipi(struct pt_regs *regs) { return 0; }
static inline int debugger_bpt(struct pt_regs *regs) { return 0; }
static inline int debugger_sstep(struct pt_regs *regs) { return 0; }
static inline int debugger_iabr_match(struct pt_regs *regs) { return 0; }
static inline int debugger_dabr_match(struct pt_regs *regs) { return 0; }
static inline int debugger_break_match(struct pt_regs *regs) { return 0; }
static inline int debugger_fault_handler(struct pt_regs *regs) { return 0; }
#endif
extern int set_dabr(unsigned long dabr, unsigned long dabrx);
int set_break(struct arch_hw_breakpoint *brk);
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
extern void do_send_trap(struct pt_regs *regs, unsigned long address,
unsigned long error_code, int signal_code, int brkpt);
#else
extern void do_dabr(struct pt_regs *regs, unsigned long address,
unsigned long error_code);
extern void do_break(struct pt_regs *regs, unsigned long address,
unsigned long error_code);
#endif
#endif /* _ASM_POWERPC_DEBUG_H */