sparc: We need to implement arch_ptrace_stop().

In order to always provide fully synchronized state to the debugger,
we might need to do a synchronize_user_stack().

A pair of hooks, arch_ptrace_stop_needed() and arch_ptrace_stop(),
exist to handle this kind of situation.  It was created for
the sake of IA64.

Use them, to flush the kernel side cached register windows
to the user stack, when necessary.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/include/asm/ptrace_32.h b/arch/sparc/include/asm/ptrace_32.h
index d409c4f21a5cdea420e75fef24a2ceec1cb0e834..4cef450167dd6ae697e7e429078979f2277f92fd 100644 (file)
--- a/arch/sparc/include/asm/ptrace_32.h
+++ b/arch/sparc/include/asm/ptrace_32.h
@@ -62,6 +62,8 @@ struct sparc_stackf {
 
 #ifdef __KERNEL__
 
+#include <asm/system.h>
+
 static inline bool pt_regs_is_syscall(struct pt_regs *regs)
 {
        return (regs->psr & PSR_SYSCALL);
@@ -72,6 +74,14 @@ static inline bool pt_regs_clear_syscall(struct pt_regs *regs)
        return (regs->psr &= ~PSR_SYSCALL);
 }
 
+#define arch_ptrace_stop_needed(exit_code, info) \
+({     flush_user_windows(); \
+       current_thread_info()->w_saved != 0;    \
+})
+
+#define arch_ptrace_stop(exit_code, info) \
+       synchronize_user_stack()
+
 #define user_mode(regs) (!((regs)->psr & PSR_PS))
 #define instruction_pointer(regs) ((regs)->pc)
 #define user_stack_pointer(regs) ((regs)->u_regs[UREG_FP])

diff --git a/arch/sparc/include/asm/ptrace_64.h b/arch/sparc/include/asm/ptrace_64.h
index 84e969f06afe318d986a9890d130cbf26759b704..cd6fbfc2043533636dd16fec2918cf0a07124be1 100644 (file)
--- a/arch/sparc/include/asm/ptrace_64.h
+++ b/arch/sparc/include/asm/ptrace_64.h
@@ -114,6 +114,7 @@ struct sparc_trapf {
 #ifdef __KERNEL__
 
 #include <linux/threads.h>
+#include <asm/system.h>
 
 static inline int pt_regs_trap_type(struct pt_regs *regs)
 {
@@ -130,6 +131,14 @@ static inline bool pt_regs_clear_syscall(struct pt_regs *regs)
        return (regs->tstate &= ~TSTATE_SYSCALL);
 }
 
+#define arch_ptrace_stop_needed(exit_code, info) \
+({     flush_user_windows(); \
+       get_thread_wsaved() != 0; \
+})
+
+#define arch_ptrace_stop(exit_code, info) \
+       synchronize_user_stack()
+
 struct global_reg_snapshot {
        unsigned long           tstate;
        unsigned long           tpc;