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https://github.com/edk2-porting/linux-next.git
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a53fd61ac2
On powerpc, ptrace will disable hardware breakpoint request once the breakpoint is hit. It is the responsibility of the caller to set it again. However, when the caller sets the hardware breakpoint again using ptrace(PTRACE_SET_DEBUGREG, child_pid, 0, addr), the hardware breakpoint is not enabled. While gdb's approach is to unregister and re-register the hardware breakpoint every time the breakpoint is hit - which is working fine, this could affect other programs trying to re-register hardware breakpoint without unregistering. This patch enables hardware breakpoint if the caller is re-registering. Signed-off-by: Aravinda Prasad <aravinda@linux.vnet.ibm.com> Acked-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
1793 lines
45 KiB
C
1793 lines
45 KiB
C
/*
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* PowerPC version
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Derived from "arch/m68k/kernel/ptrace.c"
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* Copyright (C) 1994 by Hamish Macdonald
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* Taken from linux/kernel/ptrace.c and modified for M680x0.
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* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
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*
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* Modified by Cort Dougan (cort@hq.fsmlabs.com)
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* and Paul Mackerras (paulus@samba.org).
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file README.legal in the main directory of
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* this archive for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/regset.h>
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#include <linux/tracehook.h>
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#include <linux/elf.h>
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#include <linux/user.h>
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#include <linux/security.h>
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#include <linux/signal.h>
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#include <linux/seccomp.h>
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#include <linux/audit.h>
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#include <trace/syscall.h>
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#include <linux/hw_breakpoint.h>
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#include <linux/perf_event.h>
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#include <asm/uaccess.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/switch_to.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/syscalls.h>
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/*
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* The parameter save area on the stack is used to store arguments being passed
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* to callee function and is located at fixed offset from stack pointer.
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*/
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#ifdef CONFIG_PPC32
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#define PARAMETER_SAVE_AREA_OFFSET 24 /* bytes */
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#else /* CONFIG_PPC32 */
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#define PARAMETER_SAVE_AREA_OFFSET 48 /* bytes */
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#endif
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struct pt_regs_offset {
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const char *name;
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int offset;
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};
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#define STR(s) #s /* convert to string */
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#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
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#define GPR_OFFSET_NAME(num) \
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{.name = STR(gpr##num), .offset = offsetof(struct pt_regs, gpr[num])}
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#define REG_OFFSET_END {.name = NULL, .offset = 0}
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static const struct pt_regs_offset regoffset_table[] = {
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GPR_OFFSET_NAME(0),
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GPR_OFFSET_NAME(1),
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GPR_OFFSET_NAME(2),
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GPR_OFFSET_NAME(3),
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GPR_OFFSET_NAME(4),
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GPR_OFFSET_NAME(5),
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GPR_OFFSET_NAME(6),
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GPR_OFFSET_NAME(7),
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GPR_OFFSET_NAME(8),
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GPR_OFFSET_NAME(9),
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GPR_OFFSET_NAME(10),
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GPR_OFFSET_NAME(11),
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GPR_OFFSET_NAME(12),
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GPR_OFFSET_NAME(13),
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GPR_OFFSET_NAME(14),
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GPR_OFFSET_NAME(15),
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GPR_OFFSET_NAME(16),
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GPR_OFFSET_NAME(17),
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GPR_OFFSET_NAME(18),
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GPR_OFFSET_NAME(19),
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GPR_OFFSET_NAME(20),
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GPR_OFFSET_NAME(21),
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GPR_OFFSET_NAME(22),
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GPR_OFFSET_NAME(23),
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GPR_OFFSET_NAME(24),
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GPR_OFFSET_NAME(25),
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GPR_OFFSET_NAME(26),
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GPR_OFFSET_NAME(27),
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GPR_OFFSET_NAME(28),
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GPR_OFFSET_NAME(29),
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GPR_OFFSET_NAME(30),
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GPR_OFFSET_NAME(31),
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REG_OFFSET_NAME(nip),
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REG_OFFSET_NAME(msr),
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REG_OFFSET_NAME(ctr),
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REG_OFFSET_NAME(link),
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REG_OFFSET_NAME(xer),
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REG_OFFSET_NAME(ccr),
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#ifdef CONFIG_PPC64
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REG_OFFSET_NAME(softe),
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#else
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REG_OFFSET_NAME(mq),
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#endif
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REG_OFFSET_NAME(trap),
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REG_OFFSET_NAME(dar),
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REG_OFFSET_NAME(dsisr),
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REG_OFFSET_END,
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};
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/**
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* regs_query_register_offset() - query register offset from its name
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* @name: the name of a register
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*
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* regs_query_register_offset() returns the offset of a register in struct
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* pt_regs from its name. If the name is invalid, this returns -EINVAL;
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*/
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int regs_query_register_offset(const char *name)
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{
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const struct pt_regs_offset *roff;
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for (roff = regoffset_table; roff->name != NULL; roff++)
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if (!strcmp(roff->name, name))
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return roff->offset;
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return -EINVAL;
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}
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/**
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* regs_query_register_name() - query register name from its offset
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* @offset: the offset of a register in struct pt_regs.
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*
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* regs_query_register_name() returns the name of a register from its
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* offset in struct pt_regs. If the @offset is invalid, this returns NULL;
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*/
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const char *regs_query_register_name(unsigned int offset)
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{
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const struct pt_regs_offset *roff;
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for (roff = regoffset_table; roff->name != NULL; roff++)
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if (roff->offset == offset)
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return roff->name;
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return NULL;
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}
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/*
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* does not yet catch signals sent when the child dies.
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* in exit.c or in signal.c.
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*/
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/*
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* Set of msr bits that gdb can change on behalf of a process.
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*/
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#ifdef CONFIG_PPC_ADV_DEBUG_REGS
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#define MSR_DEBUGCHANGE 0
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#else
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#define MSR_DEBUGCHANGE (MSR_SE | MSR_BE)
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#endif
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/*
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* Max register writeable via put_reg
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*/
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#ifdef CONFIG_PPC32
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#define PT_MAX_PUT_REG PT_MQ
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#else
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#define PT_MAX_PUT_REG PT_CCR
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#endif
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static unsigned long get_user_msr(struct task_struct *task)
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{
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return task->thread.regs->msr | task->thread.fpexc_mode;
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}
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static int set_user_msr(struct task_struct *task, unsigned long msr)
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{
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task->thread.regs->msr &= ~MSR_DEBUGCHANGE;
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task->thread.regs->msr |= msr & MSR_DEBUGCHANGE;
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return 0;
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}
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/*
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* We prevent mucking around with the reserved area of trap
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* which are used internally by the kernel.
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*/
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static int set_user_trap(struct task_struct *task, unsigned long trap)
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{
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task->thread.regs->trap = trap & 0xfff0;
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return 0;
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}
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/*
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* Get contents of register REGNO in task TASK.
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*/
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unsigned long ptrace_get_reg(struct task_struct *task, int regno)
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{
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if (task->thread.regs == NULL)
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return -EIO;
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if (regno == PT_MSR)
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return get_user_msr(task);
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if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long)))
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return ((unsigned long *)task->thread.regs)[regno];
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return -EIO;
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}
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/*
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* Write contents of register REGNO in task TASK.
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*/
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int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
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{
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if (task->thread.regs == NULL)
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return -EIO;
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if (regno == PT_MSR)
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return set_user_msr(task, data);
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if (regno == PT_TRAP)
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return set_user_trap(task, data);
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if (regno <= PT_MAX_PUT_REG) {
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((unsigned long *)task->thread.regs)[regno] = data;
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return 0;
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}
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return -EIO;
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}
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static int gpr_get(struct task_struct *target, const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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int i, ret;
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if (target->thread.regs == NULL)
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return -EIO;
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if (!FULL_REGS(target->thread.regs)) {
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/* We have a partial register set. Fill 14-31 with bogus values */
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for (i = 14; i < 32; i++)
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target->thread.regs->gpr[i] = NV_REG_POISON;
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}
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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target->thread.regs,
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0, offsetof(struct pt_regs, msr));
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if (!ret) {
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unsigned long msr = get_user_msr(target);
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &msr,
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offsetof(struct pt_regs, msr),
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offsetof(struct pt_regs, msr) +
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sizeof(msr));
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}
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BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
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offsetof(struct pt_regs, msr) + sizeof(long));
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if (!ret)
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&target->thread.regs->orig_gpr3,
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offsetof(struct pt_regs, orig_gpr3),
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sizeof(struct pt_regs));
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if (!ret)
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ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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sizeof(struct pt_regs), -1);
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return ret;
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}
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static int gpr_set(struct task_struct *target, const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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unsigned long reg;
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int ret;
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if (target->thread.regs == NULL)
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return -EIO;
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CHECK_FULL_REGS(target->thread.regs);
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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target->thread.regs,
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0, PT_MSR * sizeof(reg));
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if (!ret && count > 0) {
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®,
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PT_MSR * sizeof(reg),
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(PT_MSR + 1) * sizeof(reg));
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if (!ret)
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ret = set_user_msr(target, reg);
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}
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BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
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offsetof(struct pt_regs, msr) + sizeof(long));
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if (!ret)
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&target->thread.regs->orig_gpr3,
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PT_ORIG_R3 * sizeof(reg),
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(PT_MAX_PUT_REG + 1) * sizeof(reg));
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if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
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ret = user_regset_copyin_ignore(
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&pos, &count, &kbuf, &ubuf,
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(PT_MAX_PUT_REG + 1) * sizeof(reg),
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PT_TRAP * sizeof(reg));
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if (!ret && count > 0) {
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®,
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PT_TRAP * sizeof(reg),
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(PT_TRAP + 1) * sizeof(reg));
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if (!ret)
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ret = set_user_trap(target, reg);
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}
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if (!ret)
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ret = user_regset_copyin_ignore(
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&pos, &count, &kbuf, &ubuf,
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(PT_TRAP + 1) * sizeof(reg), -1);
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return ret;
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}
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static int fpr_get(struct task_struct *target, const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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#ifdef CONFIG_VSX
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double buf[33];
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int i;
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#endif
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flush_fp_to_thread(target);
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#ifdef CONFIG_VSX
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/* copy to local buffer then write that out */
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for (i = 0; i < 32 ; i++)
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buf[i] = target->thread.TS_FPR(i);
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memcpy(&buf[32], &target->thread.fpscr, sizeof(double));
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
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#else
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BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
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offsetof(struct thread_struct, TS_FPR(32)));
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&target->thread.fpr, 0, -1);
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#endif
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}
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static int fpr_set(struct task_struct *target, const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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#ifdef CONFIG_VSX
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double buf[33];
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int i;
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#endif
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flush_fp_to_thread(target);
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#ifdef CONFIG_VSX
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/* copy to local buffer then write that out */
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i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
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if (i)
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return i;
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for (i = 0; i < 32 ; i++)
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target->thread.TS_FPR(i) = buf[i];
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memcpy(&target->thread.fpscr, &buf[32], sizeof(double));
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return 0;
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#else
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BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
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offsetof(struct thread_struct, TS_FPR(32)));
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return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&target->thread.fpr, 0, -1);
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#endif
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}
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#ifdef CONFIG_ALTIVEC
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/*
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* Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
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* The transfer totals 34 quadword. Quadwords 0-31 contain the
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* corresponding vector registers. Quadword 32 contains the vscr as the
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* last word (offset 12) within that quadword. Quadword 33 contains the
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* vrsave as the first word (offset 0) within the quadword.
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*
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* This definition of the VMX state is compatible with the current PPC32
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* ptrace interface. This allows signal handling and ptrace to use the
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* same structures. This also simplifies the implementation of a bi-arch
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* (combined (32- and 64-bit) gdb.
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*/
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static int vr_active(struct task_struct *target,
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const struct user_regset *regset)
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{
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flush_altivec_to_thread(target);
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return target->thread.used_vr ? regset->n : 0;
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}
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static int vr_get(struct task_struct *target, const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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int ret;
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flush_altivec_to_thread(target);
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BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
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offsetof(struct thread_struct, vr[32]));
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&target->thread.vr, 0,
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33 * sizeof(vector128));
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if (!ret) {
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/*
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* Copy out only the low-order word of vrsave.
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*/
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union {
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elf_vrreg_t reg;
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u32 word;
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} vrsave;
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memset(&vrsave, 0, sizeof(vrsave));
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vrsave.word = target->thread.vrsave;
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &vrsave,
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33 * sizeof(vector128), -1);
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}
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return ret;
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}
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|
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static int vr_set(struct task_struct *target, const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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int ret;
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flush_altivec_to_thread(target);
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BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
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offsetof(struct thread_struct, vr[32]));
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&target->thread.vr, 0, 33 * sizeof(vector128));
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if (!ret && count > 0) {
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/*
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* We use only the first word of vrsave.
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*/
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union {
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elf_vrreg_t reg;
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u32 word;
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} vrsave;
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memset(&vrsave, 0, sizeof(vrsave));
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vrsave.word = target->thread.vrsave;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave,
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33 * sizeof(vector128), -1);
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if (!ret)
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target->thread.vrsave = vrsave.word;
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}
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return ret;
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|
}
|
|
#endif /* CONFIG_ALTIVEC */
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|
|
#ifdef CONFIG_VSX
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|
/*
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|
* Currently to set and and get all the vsx state, you need to call
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* the fp and VMX calls as well. This only get/sets the lower 32
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* 128bit VSX registers.
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|
*/
|
|
|
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static int vsr_active(struct task_struct *target,
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const struct user_regset *regset)
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|
{
|
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flush_vsx_to_thread(target);
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return target->thread.used_vsr ? regset->n : 0;
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}
|
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|
|
static int vsr_get(struct task_struct *target, const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
double buf[32];
|
|
int ret, i;
|
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|
|
flush_vsx_to_thread(target);
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|
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for (i = 0; i < 32 ; i++)
|
|
buf[i] = target->thread.fpr[i][TS_VSRLOWOFFSET];
|
|
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
buf, 0, 32 * sizeof(double));
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int vsr_set(struct task_struct *target, const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
double buf[32];
|
|
int ret,i;
|
|
|
|
flush_vsx_to_thread(target);
|
|
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
|
|
buf, 0, 32 * sizeof(double));
|
|
for (i = 0; i < 32 ; i++)
|
|
target->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i];
|
|
|
|
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_VSX */
|
|
|
|
#ifdef CONFIG_SPE
|
|
|
|
/*
|
|
* For get_evrregs/set_evrregs functions 'data' has the following layout:
|
|
*
|
|
* struct {
|
|
* u32 evr[32];
|
|
* u64 acc;
|
|
* u32 spefscr;
|
|
* }
|
|
*/
|
|
|
|
static int evr_active(struct task_struct *target,
|
|
const struct user_regset *regset)
|
|
{
|
|
flush_spe_to_thread(target);
|
|
return target->thread.used_spe ? regset->n : 0;
|
|
}
|
|
|
|
static int evr_get(struct task_struct *target, const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
int ret;
|
|
|
|
flush_spe_to_thread(target);
|
|
|
|
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
&target->thread.evr,
|
|
0, sizeof(target->thread.evr));
|
|
|
|
BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
|
|
offsetof(struct thread_struct, spefscr));
|
|
|
|
if (!ret)
|
|
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
&target->thread.acc,
|
|
sizeof(target->thread.evr), -1);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int evr_set(struct task_struct *target, const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
int ret;
|
|
|
|
flush_spe_to_thread(target);
|
|
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
|
|
&target->thread.evr,
|
|
0, sizeof(target->thread.evr));
|
|
|
|
BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
|
|
offsetof(struct thread_struct, spefscr));
|
|
|
|
if (!ret)
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
|
|
&target->thread.acc,
|
|
sizeof(target->thread.evr), -1);
|
|
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_SPE */
|
|
|
|
|
|
/*
|
|
* These are our native regset flavors.
|
|
*/
|
|
enum powerpc_regset {
|
|
REGSET_GPR,
|
|
REGSET_FPR,
|
|
#ifdef CONFIG_ALTIVEC
|
|
REGSET_VMX,
|
|
#endif
|
|
#ifdef CONFIG_VSX
|
|
REGSET_VSX,
|
|
#endif
|
|
#ifdef CONFIG_SPE
|
|
REGSET_SPE,
|
|
#endif
|
|
};
|
|
|
|
static const struct user_regset native_regsets[] = {
|
|
[REGSET_GPR] = {
|
|
.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
|
|
.size = sizeof(long), .align = sizeof(long),
|
|
.get = gpr_get, .set = gpr_set
|
|
},
|
|
[REGSET_FPR] = {
|
|
.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
|
|
.size = sizeof(double), .align = sizeof(double),
|
|
.get = fpr_get, .set = fpr_set
|
|
},
|
|
#ifdef CONFIG_ALTIVEC
|
|
[REGSET_VMX] = {
|
|
.core_note_type = NT_PPC_VMX, .n = 34,
|
|
.size = sizeof(vector128), .align = sizeof(vector128),
|
|
.active = vr_active, .get = vr_get, .set = vr_set
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_VSX
|
|
[REGSET_VSX] = {
|
|
.core_note_type = NT_PPC_VSX, .n = 32,
|
|
.size = sizeof(double), .align = sizeof(double),
|
|
.active = vsr_active, .get = vsr_get, .set = vsr_set
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_SPE
|
|
[REGSET_SPE] = {
|
|
.n = 35,
|
|
.size = sizeof(u32), .align = sizeof(u32),
|
|
.active = evr_active, .get = evr_get, .set = evr_set
|
|
},
|
|
#endif
|
|
};
|
|
|
|
static const struct user_regset_view user_ppc_native_view = {
|
|
.name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
|
|
.regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
|
|
};
|
|
|
|
#ifdef CONFIG_PPC64
|
|
#include <linux/compat.h>
|
|
|
|
static int gpr32_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
const unsigned long *regs = &target->thread.regs->gpr[0];
|
|
compat_ulong_t *k = kbuf;
|
|
compat_ulong_t __user *u = ubuf;
|
|
compat_ulong_t reg;
|
|
int i;
|
|
|
|
if (target->thread.regs == NULL)
|
|
return -EIO;
|
|
|
|
if (!FULL_REGS(target->thread.regs)) {
|
|
/* We have a partial register set. Fill 14-31 with bogus values */
|
|
for (i = 14; i < 32; i++)
|
|
target->thread.regs->gpr[i] = NV_REG_POISON;
|
|
}
|
|
|
|
pos /= sizeof(reg);
|
|
count /= sizeof(reg);
|
|
|
|
if (kbuf)
|
|
for (; count > 0 && pos < PT_MSR; --count)
|
|
*k++ = regs[pos++];
|
|
else
|
|
for (; count > 0 && pos < PT_MSR; --count)
|
|
if (__put_user((compat_ulong_t) regs[pos++], u++))
|
|
return -EFAULT;
|
|
|
|
if (count > 0 && pos == PT_MSR) {
|
|
reg = get_user_msr(target);
|
|
if (kbuf)
|
|
*k++ = reg;
|
|
else if (__put_user(reg, u++))
|
|
return -EFAULT;
|
|
++pos;
|
|
--count;
|
|
}
|
|
|
|
if (kbuf)
|
|
for (; count > 0 && pos < PT_REGS_COUNT; --count)
|
|
*k++ = regs[pos++];
|
|
else
|
|
for (; count > 0 && pos < PT_REGS_COUNT; --count)
|
|
if (__put_user((compat_ulong_t) regs[pos++], u++))
|
|
return -EFAULT;
|
|
|
|
kbuf = k;
|
|
ubuf = u;
|
|
pos *= sizeof(reg);
|
|
count *= sizeof(reg);
|
|
return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
|
|
PT_REGS_COUNT * sizeof(reg), -1);
|
|
}
|
|
|
|
static int gpr32_set(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
unsigned long *regs = &target->thread.regs->gpr[0];
|
|
const compat_ulong_t *k = kbuf;
|
|
const compat_ulong_t __user *u = ubuf;
|
|
compat_ulong_t reg;
|
|
|
|
if (target->thread.regs == NULL)
|
|
return -EIO;
|
|
|
|
CHECK_FULL_REGS(target->thread.regs);
|
|
|
|
pos /= sizeof(reg);
|
|
count /= sizeof(reg);
|
|
|
|
if (kbuf)
|
|
for (; count > 0 && pos < PT_MSR; --count)
|
|
regs[pos++] = *k++;
|
|
else
|
|
for (; count > 0 && pos < PT_MSR; --count) {
|
|
if (__get_user(reg, u++))
|
|
return -EFAULT;
|
|
regs[pos++] = reg;
|
|
}
|
|
|
|
|
|
if (count > 0 && pos == PT_MSR) {
|
|
if (kbuf)
|
|
reg = *k++;
|
|
else if (__get_user(reg, u++))
|
|
return -EFAULT;
|
|
set_user_msr(target, reg);
|
|
++pos;
|
|
--count;
|
|
}
|
|
|
|
if (kbuf) {
|
|
for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
|
|
regs[pos++] = *k++;
|
|
for (; count > 0 && pos < PT_TRAP; --count, ++pos)
|
|
++k;
|
|
} else {
|
|
for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
|
|
if (__get_user(reg, u++))
|
|
return -EFAULT;
|
|
regs[pos++] = reg;
|
|
}
|
|
for (; count > 0 && pos < PT_TRAP; --count, ++pos)
|
|
if (__get_user(reg, u++))
|
|
return -EFAULT;
|
|
}
|
|
|
|
if (count > 0 && pos == PT_TRAP) {
|
|
if (kbuf)
|
|
reg = *k++;
|
|
else if (__get_user(reg, u++))
|
|
return -EFAULT;
|
|
set_user_trap(target, reg);
|
|
++pos;
|
|
--count;
|
|
}
|
|
|
|
kbuf = k;
|
|
ubuf = u;
|
|
pos *= sizeof(reg);
|
|
count *= sizeof(reg);
|
|
return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
|
|
(PT_TRAP + 1) * sizeof(reg), -1);
|
|
}
|
|
|
|
/*
|
|
* These are the regset flavors matching the CONFIG_PPC32 native set.
|
|
*/
|
|
static const struct user_regset compat_regsets[] = {
|
|
[REGSET_GPR] = {
|
|
.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
|
|
.size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
|
|
.get = gpr32_get, .set = gpr32_set
|
|
},
|
|
[REGSET_FPR] = {
|
|
.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
|
|
.size = sizeof(double), .align = sizeof(double),
|
|
.get = fpr_get, .set = fpr_set
|
|
},
|
|
#ifdef CONFIG_ALTIVEC
|
|
[REGSET_VMX] = {
|
|
.core_note_type = NT_PPC_VMX, .n = 34,
|
|
.size = sizeof(vector128), .align = sizeof(vector128),
|
|
.active = vr_active, .get = vr_get, .set = vr_set
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_SPE
|
|
[REGSET_SPE] = {
|
|
.core_note_type = NT_PPC_SPE, .n = 35,
|
|
.size = sizeof(u32), .align = sizeof(u32),
|
|
.active = evr_active, .get = evr_get, .set = evr_set
|
|
},
|
|
#endif
|
|
};
|
|
|
|
static const struct user_regset_view user_ppc_compat_view = {
|
|
.name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
|
|
.regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
|
|
};
|
|
#endif /* CONFIG_PPC64 */
|
|
|
|
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
|
|
{
|
|
#ifdef CONFIG_PPC64
|
|
if (test_tsk_thread_flag(task, TIF_32BIT))
|
|
return &user_ppc_compat_view;
|
|
#endif
|
|
return &user_ppc_native_view;
|
|
}
|
|
|
|
|
|
void user_enable_single_step(struct task_struct *task)
|
|
{
|
|
struct pt_regs *regs = task->thread.regs;
|
|
|
|
if (regs != NULL) {
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
|
|
task->thread.dbcr0 &= ~DBCR0_BT;
|
|
task->thread.dbcr0 |= DBCR0_IDM | DBCR0_IC;
|
|
regs->msr |= MSR_DE;
|
|
#else
|
|
regs->msr &= ~MSR_BE;
|
|
regs->msr |= MSR_SE;
|
|
#endif
|
|
}
|
|
set_tsk_thread_flag(task, TIF_SINGLESTEP);
|
|
}
|
|
|
|
void user_enable_block_step(struct task_struct *task)
|
|
{
|
|
struct pt_regs *regs = task->thread.regs;
|
|
|
|
if (regs != NULL) {
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
|
|
task->thread.dbcr0 &= ~DBCR0_IC;
|
|
task->thread.dbcr0 = DBCR0_IDM | DBCR0_BT;
|
|
regs->msr |= MSR_DE;
|
|
#else
|
|
regs->msr &= ~MSR_SE;
|
|
regs->msr |= MSR_BE;
|
|
#endif
|
|
}
|
|
set_tsk_thread_flag(task, TIF_SINGLESTEP);
|
|
}
|
|
|
|
void user_disable_single_step(struct task_struct *task)
|
|
{
|
|
struct pt_regs *regs = task->thread.regs;
|
|
|
|
if (regs != NULL) {
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
|
|
/*
|
|
* The logic to disable single stepping should be as
|
|
* simple as turning off the Instruction Complete flag.
|
|
* And, after doing so, if all debug flags are off, turn
|
|
* off DBCR0(IDM) and MSR(DE) .... Torez
|
|
*/
|
|
task->thread.dbcr0 &= ~DBCR0_IC;
|
|
/*
|
|
* Test to see if any of the DBCR_ACTIVE_EVENTS bits are set.
|
|
*/
|
|
if (!DBCR_ACTIVE_EVENTS(task->thread.dbcr0,
|
|
task->thread.dbcr1)) {
|
|
/*
|
|
* All debug events were off.....
|
|
*/
|
|
task->thread.dbcr0 &= ~DBCR0_IDM;
|
|
regs->msr &= ~MSR_DE;
|
|
}
|
|
#else
|
|
regs->msr &= ~(MSR_SE | MSR_BE);
|
|
#endif
|
|
}
|
|
clear_tsk_thread_flag(task, TIF_SINGLESTEP);
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT
|
|
void ptrace_triggered(struct perf_event *bp,
|
|
struct perf_sample_data *data, struct pt_regs *regs)
|
|
{
|
|
struct perf_event_attr attr;
|
|
|
|
/*
|
|
* Disable the breakpoint request here since ptrace has defined a
|
|
* one-shot behaviour for breakpoint exceptions in PPC64.
|
|
* The SIGTRAP signal is generated automatically for us in do_dabr().
|
|
* We don't have to do anything about that here
|
|
*/
|
|
attr = bp->attr;
|
|
attr.disabled = true;
|
|
modify_user_hw_breakpoint(bp, &attr);
|
|
}
|
|
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
|
|
|
|
int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
|
|
unsigned long data)
|
|
{
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT
|
|
int ret;
|
|
struct thread_struct *thread = &(task->thread);
|
|
struct perf_event *bp;
|
|
struct perf_event_attr attr;
|
|
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
|
|
|
|
/* For ppc64 we support one DABR and no IABR's at the moment (ppc64).
|
|
* For embedded processors we support one DAC and no IAC's at the
|
|
* moment.
|
|
*/
|
|
if (addr > 0)
|
|
return -EINVAL;
|
|
|
|
/* The bottom 3 bits in dabr are flags */
|
|
if ((data & ~0x7UL) >= TASK_SIZE)
|
|
return -EIO;
|
|
|
|
#ifndef CONFIG_PPC_ADV_DEBUG_REGS
|
|
/* For processors using DABR (i.e. 970), the bottom 3 bits are flags.
|
|
* It was assumed, on previous implementations, that 3 bits were
|
|
* passed together with the data address, fitting the design of the
|
|
* DABR register, as follows:
|
|
*
|
|
* bit 0: Read flag
|
|
* bit 1: Write flag
|
|
* bit 2: Breakpoint translation
|
|
*
|
|
* Thus, we use them here as so.
|
|
*/
|
|
|
|
/* Ensure breakpoint translation bit is set */
|
|
if (data && !(data & DABR_TRANSLATION))
|
|
return -EIO;
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT
|
|
if (ptrace_get_breakpoints(task) < 0)
|
|
return -ESRCH;
|
|
|
|
bp = thread->ptrace_bps[0];
|
|
if ((!data) || !(data & (DABR_DATA_WRITE | DABR_DATA_READ))) {
|
|
if (bp) {
|
|
unregister_hw_breakpoint(bp);
|
|
thread->ptrace_bps[0] = NULL;
|
|
}
|
|
ptrace_put_breakpoints(task);
|
|
return 0;
|
|
}
|
|
if (bp) {
|
|
attr = bp->attr;
|
|
attr.bp_addr = data & ~HW_BREAKPOINT_ALIGN;
|
|
arch_bp_generic_fields(data &
|
|
(DABR_DATA_WRITE | DABR_DATA_READ),
|
|
&attr.bp_type);
|
|
|
|
/* Enable breakpoint */
|
|
attr.disabled = false;
|
|
|
|
ret = modify_user_hw_breakpoint(bp, &attr);
|
|
if (ret) {
|
|
ptrace_put_breakpoints(task);
|
|
return ret;
|
|
}
|
|
thread->ptrace_bps[0] = bp;
|
|
ptrace_put_breakpoints(task);
|
|
thread->dabr = data;
|
|
thread->dabrx = DABRX_ALL;
|
|
return 0;
|
|
}
|
|
|
|
/* Create a new breakpoint request if one doesn't exist already */
|
|
hw_breakpoint_init(&attr);
|
|
attr.bp_addr = data & ~HW_BREAKPOINT_ALIGN;
|
|
arch_bp_generic_fields(data & (DABR_DATA_WRITE | DABR_DATA_READ),
|
|
&attr.bp_type);
|
|
|
|
thread->ptrace_bps[0] = bp = register_user_hw_breakpoint(&attr,
|
|
ptrace_triggered, NULL, task);
|
|
if (IS_ERR(bp)) {
|
|
thread->ptrace_bps[0] = NULL;
|
|
ptrace_put_breakpoints(task);
|
|
return PTR_ERR(bp);
|
|
}
|
|
|
|
ptrace_put_breakpoints(task);
|
|
|
|
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
|
|
|
|
/* Move contents to the DABR register */
|
|
task->thread.dabr = data;
|
|
task->thread.dabrx = DABRX_ALL;
|
|
#else /* CONFIG_PPC_ADV_DEBUG_REGS */
|
|
/* As described above, it was assumed 3 bits were passed with the data
|
|
* address, but we will assume only the mode bits will be passed
|
|
* as to not cause alignment restrictions for DAC-based processors.
|
|
*/
|
|
|
|
/* DAC's hold the whole address without any mode flags */
|
|
task->thread.dac1 = data & ~0x3UL;
|
|
|
|
if (task->thread.dac1 == 0) {
|
|
dbcr_dac(task) &= ~(DBCR_DAC1R | DBCR_DAC1W);
|
|
if (!DBCR_ACTIVE_EVENTS(task->thread.dbcr0,
|
|
task->thread.dbcr1)) {
|
|
task->thread.regs->msr &= ~MSR_DE;
|
|
task->thread.dbcr0 &= ~DBCR0_IDM;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Read or Write bits must be set */
|
|
|
|
if (!(data & 0x3UL))
|
|
return -EINVAL;
|
|
|
|
/* Set the Internal Debugging flag (IDM bit 1) for the DBCR0
|
|
register */
|
|
task->thread.dbcr0 |= DBCR0_IDM;
|
|
|
|
/* Check for write and read flags and set DBCR0
|
|
accordingly */
|
|
dbcr_dac(task) &= ~(DBCR_DAC1R|DBCR_DAC1W);
|
|
if (data & 0x1UL)
|
|
dbcr_dac(task) |= DBCR_DAC1R;
|
|
if (data & 0x2UL)
|
|
dbcr_dac(task) |= DBCR_DAC1W;
|
|
task->thread.regs->msr |= MSR_DE;
|
|
#endif /* CONFIG_PPC_ADV_DEBUG_REGS */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called by kernel/ptrace.c when detaching..
|
|
*
|
|
* Make sure single step bits etc are not set.
|
|
*/
|
|
void ptrace_disable(struct task_struct *child)
|
|
{
|
|
/* make sure the single step bit is not set. */
|
|
user_disable_single_step(child);
|
|
}
|
|
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
|
|
static long set_instruction_bp(struct task_struct *child,
|
|
struct ppc_hw_breakpoint *bp_info)
|
|
{
|
|
int slot;
|
|
int slot1_in_use = ((child->thread.dbcr0 & DBCR0_IAC1) != 0);
|
|
int slot2_in_use = ((child->thread.dbcr0 & DBCR0_IAC2) != 0);
|
|
int slot3_in_use = ((child->thread.dbcr0 & DBCR0_IAC3) != 0);
|
|
int slot4_in_use = ((child->thread.dbcr0 & DBCR0_IAC4) != 0);
|
|
|
|
if (dbcr_iac_range(child) & DBCR_IAC12MODE)
|
|
slot2_in_use = 1;
|
|
if (dbcr_iac_range(child) & DBCR_IAC34MODE)
|
|
slot4_in_use = 1;
|
|
|
|
if (bp_info->addr >= TASK_SIZE)
|
|
return -EIO;
|
|
|
|
if (bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT) {
|
|
|
|
/* Make sure range is valid. */
|
|
if (bp_info->addr2 >= TASK_SIZE)
|
|
return -EIO;
|
|
|
|
/* We need a pair of IAC regsisters */
|
|
if ((!slot1_in_use) && (!slot2_in_use)) {
|
|
slot = 1;
|
|
child->thread.iac1 = bp_info->addr;
|
|
child->thread.iac2 = bp_info->addr2;
|
|
child->thread.dbcr0 |= DBCR0_IAC1;
|
|
if (bp_info->addr_mode ==
|
|
PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE)
|
|
dbcr_iac_range(child) |= DBCR_IAC12X;
|
|
else
|
|
dbcr_iac_range(child) |= DBCR_IAC12I;
|
|
#if CONFIG_PPC_ADV_DEBUG_IACS > 2
|
|
} else if ((!slot3_in_use) && (!slot4_in_use)) {
|
|
slot = 3;
|
|
child->thread.iac3 = bp_info->addr;
|
|
child->thread.iac4 = bp_info->addr2;
|
|
child->thread.dbcr0 |= DBCR0_IAC3;
|
|
if (bp_info->addr_mode ==
|
|
PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE)
|
|
dbcr_iac_range(child) |= DBCR_IAC34X;
|
|
else
|
|
dbcr_iac_range(child) |= DBCR_IAC34I;
|
|
#endif
|
|
} else
|
|
return -ENOSPC;
|
|
} else {
|
|
/* We only need one. If possible leave a pair free in
|
|
* case a range is needed later
|
|
*/
|
|
if (!slot1_in_use) {
|
|
/*
|
|
* Don't use iac1 if iac1-iac2 are free and either
|
|
* iac3 or iac4 (but not both) are free
|
|
*/
|
|
if (slot2_in_use || (slot3_in_use == slot4_in_use)) {
|
|
slot = 1;
|
|
child->thread.iac1 = bp_info->addr;
|
|
child->thread.dbcr0 |= DBCR0_IAC1;
|
|
goto out;
|
|
}
|
|
}
|
|
if (!slot2_in_use) {
|
|
slot = 2;
|
|
child->thread.iac2 = bp_info->addr;
|
|
child->thread.dbcr0 |= DBCR0_IAC2;
|
|
#if CONFIG_PPC_ADV_DEBUG_IACS > 2
|
|
} else if (!slot3_in_use) {
|
|
slot = 3;
|
|
child->thread.iac3 = bp_info->addr;
|
|
child->thread.dbcr0 |= DBCR0_IAC3;
|
|
} else if (!slot4_in_use) {
|
|
slot = 4;
|
|
child->thread.iac4 = bp_info->addr;
|
|
child->thread.dbcr0 |= DBCR0_IAC4;
|
|
#endif
|
|
} else
|
|
return -ENOSPC;
|
|
}
|
|
out:
|
|
child->thread.dbcr0 |= DBCR0_IDM;
|
|
child->thread.regs->msr |= MSR_DE;
|
|
|
|
return slot;
|
|
}
|
|
|
|
static int del_instruction_bp(struct task_struct *child, int slot)
|
|
{
|
|
switch (slot) {
|
|
case 1:
|
|
if ((child->thread.dbcr0 & DBCR0_IAC1) == 0)
|
|
return -ENOENT;
|
|
|
|
if (dbcr_iac_range(child) & DBCR_IAC12MODE) {
|
|
/* address range - clear slots 1 & 2 */
|
|
child->thread.iac2 = 0;
|
|
dbcr_iac_range(child) &= ~DBCR_IAC12MODE;
|
|
}
|
|
child->thread.iac1 = 0;
|
|
child->thread.dbcr0 &= ~DBCR0_IAC1;
|
|
break;
|
|
case 2:
|
|
if ((child->thread.dbcr0 & DBCR0_IAC2) == 0)
|
|
return -ENOENT;
|
|
|
|
if (dbcr_iac_range(child) & DBCR_IAC12MODE)
|
|
/* used in a range */
|
|
return -EINVAL;
|
|
child->thread.iac2 = 0;
|
|
child->thread.dbcr0 &= ~DBCR0_IAC2;
|
|
break;
|
|
#if CONFIG_PPC_ADV_DEBUG_IACS > 2
|
|
case 3:
|
|
if ((child->thread.dbcr0 & DBCR0_IAC3) == 0)
|
|
return -ENOENT;
|
|
|
|
if (dbcr_iac_range(child) & DBCR_IAC34MODE) {
|
|
/* address range - clear slots 3 & 4 */
|
|
child->thread.iac4 = 0;
|
|
dbcr_iac_range(child) &= ~DBCR_IAC34MODE;
|
|
}
|
|
child->thread.iac3 = 0;
|
|
child->thread.dbcr0 &= ~DBCR0_IAC3;
|
|
break;
|
|
case 4:
|
|
if ((child->thread.dbcr0 & DBCR0_IAC4) == 0)
|
|
return -ENOENT;
|
|
|
|
if (dbcr_iac_range(child) & DBCR_IAC34MODE)
|
|
/* Used in a range */
|
|
return -EINVAL;
|
|
child->thread.iac4 = 0;
|
|
child->thread.dbcr0 &= ~DBCR0_IAC4;
|
|
break;
|
|
#endif
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int set_dac(struct task_struct *child, struct ppc_hw_breakpoint *bp_info)
|
|
{
|
|
int byte_enable =
|
|
(bp_info->condition_mode >> PPC_BREAKPOINT_CONDITION_BE_SHIFT)
|
|
& 0xf;
|
|
int condition_mode =
|
|
bp_info->condition_mode & PPC_BREAKPOINT_CONDITION_MODE;
|
|
int slot;
|
|
|
|
if (byte_enable && (condition_mode == 0))
|
|
return -EINVAL;
|
|
|
|
if (bp_info->addr >= TASK_SIZE)
|
|
return -EIO;
|
|
|
|
if ((dbcr_dac(child) & (DBCR_DAC1R | DBCR_DAC1W)) == 0) {
|
|
slot = 1;
|
|
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
|
|
dbcr_dac(child) |= DBCR_DAC1R;
|
|
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
|
|
dbcr_dac(child) |= DBCR_DAC1W;
|
|
child->thread.dac1 = (unsigned long)bp_info->addr;
|
|
#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
|
|
if (byte_enable) {
|
|
child->thread.dvc1 =
|
|
(unsigned long)bp_info->condition_value;
|
|
child->thread.dbcr2 |=
|
|
((byte_enable << DBCR2_DVC1BE_SHIFT) |
|
|
(condition_mode << DBCR2_DVC1M_SHIFT));
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
|
|
} else if (child->thread.dbcr2 & DBCR2_DAC12MODE) {
|
|
/* Both dac1 and dac2 are part of a range */
|
|
return -ENOSPC;
|
|
#endif
|
|
} else if ((dbcr_dac(child) & (DBCR_DAC2R | DBCR_DAC2W)) == 0) {
|
|
slot = 2;
|
|
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
|
|
dbcr_dac(child) |= DBCR_DAC2R;
|
|
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
|
|
dbcr_dac(child) |= DBCR_DAC2W;
|
|
child->thread.dac2 = (unsigned long)bp_info->addr;
|
|
#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
|
|
if (byte_enable) {
|
|
child->thread.dvc2 =
|
|
(unsigned long)bp_info->condition_value;
|
|
child->thread.dbcr2 |=
|
|
((byte_enable << DBCR2_DVC2BE_SHIFT) |
|
|
(condition_mode << DBCR2_DVC2M_SHIFT));
|
|
}
|
|
#endif
|
|
} else
|
|
return -ENOSPC;
|
|
child->thread.dbcr0 |= DBCR0_IDM;
|
|
child->thread.regs->msr |= MSR_DE;
|
|
|
|
return slot + 4;
|
|
}
|
|
|
|
static int del_dac(struct task_struct *child, int slot)
|
|
{
|
|
if (slot == 1) {
|
|
if ((dbcr_dac(child) & (DBCR_DAC1R | DBCR_DAC1W)) == 0)
|
|
return -ENOENT;
|
|
|
|
child->thread.dac1 = 0;
|
|
dbcr_dac(child) &= ~(DBCR_DAC1R | DBCR_DAC1W);
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
|
|
if (child->thread.dbcr2 & DBCR2_DAC12MODE) {
|
|
child->thread.dac2 = 0;
|
|
child->thread.dbcr2 &= ~DBCR2_DAC12MODE;
|
|
}
|
|
child->thread.dbcr2 &= ~(DBCR2_DVC1M | DBCR2_DVC1BE);
|
|
#endif
|
|
#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
|
|
child->thread.dvc1 = 0;
|
|
#endif
|
|
} else if (slot == 2) {
|
|
if ((dbcr_dac(child) & (DBCR_DAC2R | DBCR_DAC2W)) == 0)
|
|
return -ENOENT;
|
|
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
|
|
if (child->thread.dbcr2 & DBCR2_DAC12MODE)
|
|
/* Part of a range */
|
|
return -EINVAL;
|
|
child->thread.dbcr2 &= ~(DBCR2_DVC2M | DBCR2_DVC2BE);
|
|
#endif
|
|
#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
|
|
child->thread.dvc2 = 0;
|
|
#endif
|
|
child->thread.dac2 = 0;
|
|
dbcr_dac(child) &= ~(DBCR_DAC2R | DBCR_DAC2W);
|
|
} else
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PPC_ADV_DEBUG_REGS */
|
|
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
|
|
static int set_dac_range(struct task_struct *child,
|
|
struct ppc_hw_breakpoint *bp_info)
|
|
{
|
|
int mode = bp_info->addr_mode & PPC_BREAKPOINT_MODE_MASK;
|
|
|
|
/* We don't allow range watchpoints to be used with DVC */
|
|
if (bp_info->condition_mode)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Best effort to verify the address range. The user/supervisor bits
|
|
* prevent trapping in kernel space, but let's fail on an obvious bad
|
|
* range. The simple test on the mask is not fool-proof, and any
|
|
* exclusive range will spill over into kernel space.
|
|
*/
|
|
if (bp_info->addr >= TASK_SIZE)
|
|
return -EIO;
|
|
if (mode == PPC_BREAKPOINT_MODE_MASK) {
|
|
/*
|
|
* dac2 is a bitmask. Don't allow a mask that makes a
|
|
* kernel space address from a valid dac1 value
|
|
*/
|
|
if (~((unsigned long)bp_info->addr2) >= TASK_SIZE)
|
|
return -EIO;
|
|
} else {
|
|
/*
|
|
* For range breakpoints, addr2 must also be a valid address
|
|
*/
|
|
if (bp_info->addr2 >= TASK_SIZE)
|
|
return -EIO;
|
|
}
|
|
|
|
if (child->thread.dbcr0 &
|
|
(DBCR0_DAC1R | DBCR0_DAC1W | DBCR0_DAC2R | DBCR0_DAC2W))
|
|
return -ENOSPC;
|
|
|
|
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
|
|
child->thread.dbcr0 |= (DBCR0_DAC1R | DBCR0_IDM);
|
|
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
|
|
child->thread.dbcr0 |= (DBCR0_DAC1W | DBCR0_IDM);
|
|
child->thread.dac1 = bp_info->addr;
|
|
child->thread.dac2 = bp_info->addr2;
|
|
if (mode == PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE)
|
|
child->thread.dbcr2 |= DBCR2_DAC12M;
|
|
else if (mode == PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE)
|
|
child->thread.dbcr2 |= DBCR2_DAC12MX;
|
|
else /* PPC_BREAKPOINT_MODE_MASK */
|
|
child->thread.dbcr2 |= DBCR2_DAC12MM;
|
|
child->thread.regs->msr |= MSR_DE;
|
|
|
|
return 5;
|
|
}
|
|
#endif /* CONFIG_PPC_ADV_DEBUG_DAC_RANGE */
|
|
|
|
static long ppc_set_hwdebug(struct task_struct *child,
|
|
struct ppc_hw_breakpoint *bp_info)
|
|
{
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT
|
|
int len = 0;
|
|
struct thread_struct *thread = &(child->thread);
|
|
struct perf_event *bp;
|
|
struct perf_event_attr attr;
|
|
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
|
|
#ifndef CONFIG_PPC_ADV_DEBUG_REGS
|
|
unsigned long dabr;
|
|
#endif
|
|
|
|
if (bp_info->version != 1)
|
|
return -ENOTSUPP;
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
|
|
/*
|
|
* Check for invalid flags and combinations
|
|
*/
|
|
if ((bp_info->trigger_type == 0) ||
|
|
(bp_info->trigger_type & ~(PPC_BREAKPOINT_TRIGGER_EXECUTE |
|
|
PPC_BREAKPOINT_TRIGGER_RW)) ||
|
|
(bp_info->addr_mode & ~PPC_BREAKPOINT_MODE_MASK) ||
|
|
(bp_info->condition_mode &
|
|
~(PPC_BREAKPOINT_CONDITION_MODE |
|
|
PPC_BREAKPOINT_CONDITION_BE_ALL)))
|
|
return -EINVAL;
|
|
#if CONFIG_PPC_ADV_DEBUG_DVCS == 0
|
|
if (bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE)
|
|
return -EINVAL;
|
|
#endif
|
|
|
|
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_EXECUTE) {
|
|
if ((bp_info->trigger_type != PPC_BREAKPOINT_TRIGGER_EXECUTE) ||
|
|
(bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE))
|
|
return -EINVAL;
|
|
return set_instruction_bp(child, bp_info);
|
|
}
|
|
if (bp_info->addr_mode == PPC_BREAKPOINT_MODE_EXACT)
|
|
return set_dac(child, bp_info);
|
|
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
|
|
return set_dac_range(child, bp_info);
|
|
#else
|
|
return -EINVAL;
|
|
#endif
|
|
#else /* !CONFIG_PPC_ADV_DEBUG_DVCS */
|
|
/*
|
|
* We only support one data breakpoint
|
|
*/
|
|
if ((bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_RW) == 0 ||
|
|
(bp_info->trigger_type & ~PPC_BREAKPOINT_TRIGGER_RW) != 0 ||
|
|
bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE)
|
|
return -EINVAL;
|
|
|
|
if ((unsigned long)bp_info->addr >= TASK_SIZE)
|
|
return -EIO;
|
|
|
|
dabr = (unsigned long)bp_info->addr & ~7UL;
|
|
dabr |= DABR_TRANSLATION;
|
|
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
|
|
dabr |= DABR_DATA_READ;
|
|
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
|
|
dabr |= DABR_DATA_WRITE;
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT
|
|
if (ptrace_get_breakpoints(child) < 0)
|
|
return -ESRCH;
|
|
|
|
/*
|
|
* Check if the request is for 'range' breakpoints. We can
|
|
* support it if range < 8 bytes.
|
|
*/
|
|
if (bp_info->addr_mode == PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE) {
|
|
len = bp_info->addr2 - bp_info->addr;
|
|
} else if (bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT) {
|
|
ptrace_put_breakpoints(child);
|
|
return -EINVAL;
|
|
}
|
|
bp = thread->ptrace_bps[0];
|
|
if (bp) {
|
|
ptrace_put_breakpoints(child);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
/* Create a new breakpoint request if one doesn't exist already */
|
|
hw_breakpoint_init(&attr);
|
|
attr.bp_addr = (unsigned long)bp_info->addr & ~HW_BREAKPOINT_ALIGN;
|
|
attr.bp_len = len;
|
|
arch_bp_generic_fields(dabr & (DABR_DATA_WRITE | DABR_DATA_READ),
|
|
&attr.bp_type);
|
|
|
|
thread->ptrace_bps[0] = bp = register_user_hw_breakpoint(&attr,
|
|
ptrace_triggered, NULL, child);
|
|
if (IS_ERR(bp)) {
|
|
thread->ptrace_bps[0] = NULL;
|
|
ptrace_put_breakpoints(child);
|
|
return PTR_ERR(bp);
|
|
}
|
|
|
|
ptrace_put_breakpoints(child);
|
|
return 1;
|
|
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
|
|
|
|
if (bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT)
|
|
return -EINVAL;
|
|
|
|
if (child->thread.dabr)
|
|
return -ENOSPC;
|
|
|
|
child->thread.dabr = dabr;
|
|
child->thread.dabrx = DABRX_ALL;
|
|
|
|
return 1;
|
|
#endif /* !CONFIG_PPC_ADV_DEBUG_DVCS */
|
|
}
|
|
|
|
static long ppc_del_hwdebug(struct task_struct *child, long data)
|
|
{
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT
|
|
int ret = 0;
|
|
struct thread_struct *thread = &(child->thread);
|
|
struct perf_event *bp;
|
|
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
|
|
int rc;
|
|
|
|
if (data <= 4)
|
|
rc = del_instruction_bp(child, (int)data);
|
|
else
|
|
rc = del_dac(child, (int)data - 4);
|
|
|
|
if (!rc) {
|
|
if (!DBCR_ACTIVE_EVENTS(child->thread.dbcr0,
|
|
child->thread.dbcr1)) {
|
|
child->thread.dbcr0 &= ~DBCR0_IDM;
|
|
child->thread.regs->msr &= ~MSR_DE;
|
|
}
|
|
}
|
|
return rc;
|
|
#else
|
|
if (data != 1)
|
|
return -EINVAL;
|
|
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT
|
|
if (ptrace_get_breakpoints(child) < 0)
|
|
return -ESRCH;
|
|
|
|
bp = thread->ptrace_bps[0];
|
|
if (bp) {
|
|
unregister_hw_breakpoint(bp);
|
|
thread->ptrace_bps[0] = NULL;
|
|
} else
|
|
ret = -ENOENT;
|
|
ptrace_put_breakpoints(child);
|
|
return ret;
|
|
#else /* CONFIG_HAVE_HW_BREAKPOINT */
|
|
if (child->thread.dabr == 0)
|
|
return -ENOENT;
|
|
|
|
child->thread.dabr = 0;
|
|
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
|
|
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
long arch_ptrace(struct task_struct *child, long request,
|
|
unsigned long addr, unsigned long data)
|
|
{
|
|
int ret = -EPERM;
|
|
void __user *datavp = (void __user *) data;
|
|
unsigned long __user *datalp = datavp;
|
|
|
|
switch (request) {
|
|
/* read the word at location addr in the USER area. */
|
|
case PTRACE_PEEKUSR: {
|
|
unsigned long index, tmp;
|
|
|
|
ret = -EIO;
|
|
/* convert to index and check */
|
|
#ifdef CONFIG_PPC32
|
|
index = addr >> 2;
|
|
if ((addr & 3) || (index > PT_FPSCR)
|
|
|| (child->thread.regs == NULL))
|
|
#else
|
|
index = addr >> 3;
|
|
if ((addr & 7) || (index > PT_FPSCR))
|
|
#endif
|
|
break;
|
|
|
|
CHECK_FULL_REGS(child->thread.regs);
|
|
if (index < PT_FPR0) {
|
|
tmp = ptrace_get_reg(child, (int) index);
|
|
} else {
|
|
unsigned int fpidx = index - PT_FPR0;
|
|
|
|
flush_fp_to_thread(child);
|
|
if (fpidx < (PT_FPSCR - PT_FPR0))
|
|
tmp = ((unsigned long *)child->thread.fpr)
|
|
[fpidx * TS_FPRWIDTH];
|
|
else
|
|
tmp = child->thread.fpscr.val;
|
|
}
|
|
ret = put_user(tmp, datalp);
|
|
break;
|
|
}
|
|
|
|
/* write the word at location addr in the USER area */
|
|
case PTRACE_POKEUSR: {
|
|
unsigned long index;
|
|
|
|
ret = -EIO;
|
|
/* convert to index and check */
|
|
#ifdef CONFIG_PPC32
|
|
index = addr >> 2;
|
|
if ((addr & 3) || (index > PT_FPSCR)
|
|
|| (child->thread.regs == NULL))
|
|
#else
|
|
index = addr >> 3;
|
|
if ((addr & 7) || (index > PT_FPSCR))
|
|
#endif
|
|
break;
|
|
|
|
CHECK_FULL_REGS(child->thread.regs);
|
|
if (index < PT_FPR0) {
|
|
ret = ptrace_put_reg(child, index, data);
|
|
} else {
|
|
unsigned int fpidx = index - PT_FPR0;
|
|
|
|
flush_fp_to_thread(child);
|
|
if (fpidx < (PT_FPSCR - PT_FPR0))
|
|
((unsigned long *)child->thread.fpr)
|
|
[fpidx * TS_FPRWIDTH] = data;
|
|
else
|
|
child->thread.fpscr.val = data;
|
|
ret = 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case PPC_PTRACE_GETHWDBGINFO: {
|
|
struct ppc_debug_info dbginfo;
|
|
|
|
dbginfo.version = 1;
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
|
|
dbginfo.num_instruction_bps = CONFIG_PPC_ADV_DEBUG_IACS;
|
|
dbginfo.num_data_bps = CONFIG_PPC_ADV_DEBUG_DACS;
|
|
dbginfo.num_condition_regs = CONFIG_PPC_ADV_DEBUG_DVCS;
|
|
dbginfo.data_bp_alignment = 4;
|
|
dbginfo.sizeof_condition = 4;
|
|
dbginfo.features = PPC_DEBUG_FEATURE_INSN_BP_RANGE |
|
|
PPC_DEBUG_FEATURE_INSN_BP_MASK;
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
|
|
dbginfo.features |=
|
|
PPC_DEBUG_FEATURE_DATA_BP_RANGE |
|
|
PPC_DEBUG_FEATURE_DATA_BP_MASK;
|
|
#endif
|
|
#else /* !CONFIG_PPC_ADV_DEBUG_REGS */
|
|
dbginfo.num_instruction_bps = 0;
|
|
dbginfo.num_data_bps = 1;
|
|
dbginfo.num_condition_regs = 0;
|
|
#ifdef CONFIG_PPC64
|
|
dbginfo.data_bp_alignment = 8;
|
|
#else
|
|
dbginfo.data_bp_alignment = 4;
|
|
#endif
|
|
dbginfo.sizeof_condition = 0;
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT
|
|
dbginfo.features = PPC_DEBUG_FEATURE_DATA_BP_RANGE;
|
|
#else
|
|
dbginfo.features = 0;
|
|
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
|
|
#endif /* CONFIG_PPC_ADV_DEBUG_REGS */
|
|
|
|
if (!access_ok(VERIFY_WRITE, datavp,
|
|
sizeof(struct ppc_debug_info)))
|
|
return -EFAULT;
|
|
ret = __copy_to_user(datavp, &dbginfo,
|
|
sizeof(struct ppc_debug_info)) ?
|
|
-EFAULT : 0;
|
|
break;
|
|
}
|
|
|
|
case PPC_PTRACE_SETHWDEBUG: {
|
|
struct ppc_hw_breakpoint bp_info;
|
|
|
|
if (!access_ok(VERIFY_READ, datavp,
|
|
sizeof(struct ppc_hw_breakpoint)))
|
|
return -EFAULT;
|
|
ret = __copy_from_user(&bp_info, datavp,
|
|
sizeof(struct ppc_hw_breakpoint)) ?
|
|
-EFAULT : 0;
|
|
if (!ret)
|
|
ret = ppc_set_hwdebug(child, &bp_info);
|
|
break;
|
|
}
|
|
|
|
case PPC_PTRACE_DELHWDEBUG: {
|
|
ret = ppc_del_hwdebug(child, data);
|
|
break;
|
|
}
|
|
|
|
case PTRACE_GET_DEBUGREG: {
|
|
ret = -EINVAL;
|
|
/* We only support one DABR and no IABRS at the moment */
|
|
if (addr > 0)
|
|
break;
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
|
|
ret = put_user(child->thread.dac1, datalp);
|
|
#else
|
|
ret = put_user(child->thread.dabr, datalp);
|
|
#endif
|
|
break;
|
|
}
|
|
|
|
case PTRACE_SET_DEBUGREG:
|
|
ret = ptrace_set_debugreg(child, addr, data);
|
|
break;
|
|
|
|
#ifdef CONFIG_PPC64
|
|
case PTRACE_GETREGS64:
|
|
#endif
|
|
case PTRACE_GETREGS: /* Get all pt_regs from the child. */
|
|
return copy_regset_to_user(child, &user_ppc_native_view,
|
|
REGSET_GPR,
|
|
0, sizeof(struct pt_regs),
|
|
datavp);
|
|
|
|
#ifdef CONFIG_PPC64
|
|
case PTRACE_SETREGS64:
|
|
#endif
|
|
case PTRACE_SETREGS: /* Set all gp regs in the child. */
|
|
return copy_regset_from_user(child, &user_ppc_native_view,
|
|
REGSET_GPR,
|
|
0, sizeof(struct pt_regs),
|
|
datavp);
|
|
|
|
case PTRACE_GETFPREGS: /* Get the child FPU state (FPR0...31 + FPSCR) */
|
|
return copy_regset_to_user(child, &user_ppc_native_view,
|
|
REGSET_FPR,
|
|
0, sizeof(elf_fpregset_t),
|
|
datavp);
|
|
|
|
case PTRACE_SETFPREGS: /* Set the child FPU state (FPR0...31 + FPSCR) */
|
|
return copy_regset_from_user(child, &user_ppc_native_view,
|
|
REGSET_FPR,
|
|
0, sizeof(elf_fpregset_t),
|
|
datavp);
|
|
|
|
#ifdef CONFIG_ALTIVEC
|
|
case PTRACE_GETVRREGS:
|
|
return copy_regset_to_user(child, &user_ppc_native_view,
|
|
REGSET_VMX,
|
|
0, (33 * sizeof(vector128) +
|
|
sizeof(u32)),
|
|
datavp);
|
|
|
|
case PTRACE_SETVRREGS:
|
|
return copy_regset_from_user(child, &user_ppc_native_view,
|
|
REGSET_VMX,
|
|
0, (33 * sizeof(vector128) +
|
|
sizeof(u32)),
|
|
datavp);
|
|
#endif
|
|
#ifdef CONFIG_VSX
|
|
case PTRACE_GETVSRREGS:
|
|
return copy_regset_to_user(child, &user_ppc_native_view,
|
|
REGSET_VSX,
|
|
0, 32 * sizeof(double),
|
|
datavp);
|
|
|
|
case PTRACE_SETVSRREGS:
|
|
return copy_regset_from_user(child, &user_ppc_native_view,
|
|
REGSET_VSX,
|
|
0, 32 * sizeof(double),
|
|
datavp);
|
|
#endif
|
|
#ifdef CONFIG_SPE
|
|
case PTRACE_GETEVRREGS:
|
|
/* Get the child spe register state. */
|
|
return copy_regset_to_user(child, &user_ppc_native_view,
|
|
REGSET_SPE, 0, 35 * sizeof(u32),
|
|
datavp);
|
|
|
|
case PTRACE_SETEVRREGS:
|
|
/* Set the child spe register state. */
|
|
return copy_regset_from_user(child, &user_ppc_native_view,
|
|
REGSET_SPE, 0, 35 * sizeof(u32),
|
|
datavp);
|
|
#endif
|
|
|
|
default:
|
|
ret = ptrace_request(child, request, addr, data);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* We must return the syscall number to actually look up in the table.
|
|
* This can be -1L to skip running any syscall at all.
|
|
*/
|
|
long do_syscall_trace_enter(struct pt_regs *regs)
|
|
{
|
|
long ret = 0;
|
|
|
|
secure_computing_strict(regs->gpr[0]);
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE) &&
|
|
tracehook_report_syscall_entry(regs))
|
|
/*
|
|
* Tracing decided this syscall should not happen.
|
|
* We'll return a bogus call number to get an ENOSYS
|
|
* error, but leave the original number in regs->gpr[0].
|
|
*/
|
|
ret = -1L;
|
|
|
|
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
|
|
trace_sys_enter(regs, regs->gpr[0]);
|
|
|
|
#ifdef CONFIG_PPC64
|
|
if (!is_32bit_task())
|
|
audit_syscall_entry(AUDIT_ARCH_PPC64,
|
|
regs->gpr[0],
|
|
regs->gpr[3], regs->gpr[4],
|
|
regs->gpr[5], regs->gpr[6]);
|
|
else
|
|
#endif
|
|
audit_syscall_entry(AUDIT_ARCH_PPC,
|
|
regs->gpr[0],
|
|
regs->gpr[3] & 0xffffffff,
|
|
regs->gpr[4] & 0xffffffff,
|
|
regs->gpr[5] & 0xffffffff,
|
|
regs->gpr[6] & 0xffffffff);
|
|
|
|
return ret ?: regs->gpr[0];
|
|
}
|
|
|
|
void do_syscall_trace_leave(struct pt_regs *regs)
|
|
{
|
|
int step;
|
|
|
|
audit_syscall_exit(regs);
|
|
|
|
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
|
|
trace_sys_exit(regs, regs->result);
|
|
|
|
step = test_thread_flag(TIF_SINGLESTEP);
|
|
if (step || test_thread_flag(TIF_SYSCALL_TRACE))
|
|
tracehook_report_syscall_exit(regs, step);
|
|
}
|