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Commit fd9648df authored by Anton Blanchard's avatar Anton Blanchard Committed by Paul Mackerras
Browse files

[PATCH] ppc64: Add ptrace data breakpoint support 



Add hardware data breakpoint support.

Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent a94d3085

arch/ppc64/kernel/process.c

+34 −0
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ 
#include <asm/sections.h>

#include <asm/tlbflush.h>

#include <asm/time.h>

#include <asm/plpar_wrappers.h>



#ifndef CONFIG_SMP

struct task_struct *last_task_used_math = NULL;
@@ -163,7 +164,30 @@ int dump_task_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs) 


#endif /* CONFIG_ALTIVEC */



static void set_dabr_spr(unsigned long val)

{

	mtspr(SPRN_DABR, val);

}



int set_dabr(unsigned long dabr)

{

	int ret = 0;



	if (firmware_has_feature(FW_FEATURE_XDABR)) {

		/* We want to catch accesses from kernel and userspace */

		unsigned long flags = H_DABRX_KERNEL|H_DABRX_USER;

		ret = plpar_set_xdabr(dabr, flags);

	} else if (firmware_has_feature(FW_FEATURE_DABR)) {

		ret = plpar_set_dabr(dabr);

	} else {

		set_dabr_spr(dabr);

	}



	return ret;

}



DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array);

static DEFINE_PER_CPU(unsigned long, current_dabr);



struct task_struct *__switch_to(struct task_struct *prev,

				struct task_struct *new)
@@ -198,6 +222,11 @@ struct task_struct *__switch_to(struct task_struct *prev, 
		new->thread.regs->msr |= MSR_VEC;

#endif /* CONFIG_ALTIVEC */



	if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) {

		set_dabr(new->thread.dabr);

		__get_cpu_var(current_dabr) = new->thread.dabr;

	}



	flush_tlb_pending();



	new_thread = &new->thread;
@@ -334,6 +363,11 @@ void flush_thread(void) 
		last_task_used_altivec = NULL;

#endif /* CONFIG_ALTIVEC */

#endif /* CONFIG_SMP */



	if (current->thread.dabr) {

		current->thread.dabr = 0;

		set_dabr(0);

	}

}



void

arch/ppc64/kernel/ptrace.c

+13 −0
Original line number Diff line number Diff line
@@ -207,6 +207,19 @@ int sys_ptrace(long request, long pid, long addr, long data) 
		break;

	}



	case PTRACE_GET_DEBUGREG: {

		ret = -EINVAL;

		/* We only support one DABR and no IABRS at the moment */

		if (addr > 0)

			break;

		ret = put_user(child->thread.dabr,

			       (unsigned long __user *)data);

		break;

	}



	case PTRACE_SET_DEBUGREG:

		ret = ptrace_set_debugreg(child, addr, data);



	case PTRACE_DETACH:

		ret = ptrace_detach(child, data);

		break;

arch/ppc64/kernel/ptrace32.c

+13 −0
Original line number Diff line number Diff line
@@ -338,6 +338,19 @@ int sys32_ptrace(long request, long pid, unsigned long addr, unsigned long data) 
		break;

	}



	case PTRACE_GET_DEBUGREG: {

		ret = -EINVAL;

		/* We only support one DABR and no IABRS at the moment */

		if (addr > 0)

			break;

		ret = put_user(child->thread.dabr, (u32 __user *)data);

		break;

	}



	case PTRACE_SET_DEBUGREG:

		ret = ptrace_set_debugreg(child, addr, data);

		break;



	case PTRACE_DETACH:

		ret = ptrace_detach(child, data);

		break;

arch/ppc64/kernel/ras.c

+0 −2
Original line number Diff line number Diff line
@@ -59,8 +59,6 @@ char mce_data_buf[RTAS_ERROR_LOG_MAX] 
/* This is true if we are using the firmware NMI handler (typically LPAR) */

extern int fwnmi_active;



extern void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr);



static int ras_get_sensor_state_token;

static int ras_check_exception_token;

arch/ppc64/kernel/signal.c

+9 −0
Original line number Diff line number Diff line
@@ -550,6 +550,15 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs) 
		/* Whee!  Actually deliver the signal.  */

		if (TRAP(regs) == 0x0C00)

			syscall_restart(regs, &ka);



		/*

		 * Reenable the DABR before delivering the signal to

		 * user space. The DABR will have been cleared if it

		 * triggered inside the kernel.

		 */

		if (current->thread.dabr)

			set_dabr(current->thread.dabr);



		return handle_signal(signr, &ka, &info, oldset, regs);

	}