#include "ptrace-decl.h"
-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.debug.dbcr0 &= ~DBCR0_BT;
- task->thread.debug.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.debug.dbcr0 &= ~DBCR0_IC;
- task->thread.debug.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.debug.dbcr0 &= ~(DBCR0_IC|DBCR0_BT);
- /*
- * Test to see if any of the DBCR_ACTIVE_EVENTS bits are set.
- */
- if (!DBCR_ACTIVE_EVENTS(task->thread.debug.dbcr0,
- task->thread.debug.dbcr1)) {
- /*
- * All debug events were off.....
- */
- task->thread.debug.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)
}
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
-static 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 */
-#ifndef CONFIG_PPC_ADV_DEBUG_REGS
- bool set_bp = true;
- struct arch_hw_breakpoint hw_brk;
-#endif
-
- /* 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 & HW_BRK_TYPE_TRANSLATE))
- return -EIO;
- hw_brk.address = data & (~HW_BRK_TYPE_DABR);
- hw_brk.type = (data & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL;
- hw_brk.len = DABR_MAX_LEN;
- hw_brk.hw_len = DABR_MAX_LEN;
- set_bp = (data) && (hw_brk.type & HW_BRK_TYPE_RDWR);
-#ifdef CONFIG_HAVE_HW_BREAKPOINT
- bp = thread->ptrace_bps[0];
- if (!set_bp) {
- if (bp) {
- unregister_hw_breakpoint(bp);
- thread->ptrace_bps[0] = NULL;
- }
- return 0;
- }
- if (bp) {
- attr = bp->attr;
- attr.bp_addr = hw_brk.address;
- attr.bp_len = DABR_MAX_LEN;
- arch_bp_generic_fields(hw_brk.type, &attr.bp_type);
-
- /* Enable breakpoint */
- attr.disabled = false;
-
- ret = modify_user_hw_breakpoint(bp, &attr);
- if (ret) {
- return ret;
- }
- thread->ptrace_bps[0] = bp;
- thread->hw_brk = hw_brk;
- return 0;
- }
-
- /* Create a new breakpoint request if one doesn't exist already */
- hw_breakpoint_init(&attr);
- attr.bp_addr = hw_brk.address;
- attr.bp_len = DABR_MAX_LEN;
- arch_bp_generic_fields(hw_brk.type,
- &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;
- return PTR_ERR(bp);
- }
-
-#else /* !CONFIG_HAVE_HW_BREAKPOINT */
- if (set_bp && (!ppc_breakpoint_available()))
- return -ENODEV;
-#endif /* CONFIG_HAVE_HW_BREAKPOINT */
- task->thread.hw_brk = hw_brk;
-#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.debug.dac1 = data & ~0x3UL;
-
- if (task->thread.debug.dac1 == 0) {
- dbcr_dac(task) &= ~(DBCR_DAC1R | DBCR_DAC1W);
- if (!DBCR_ACTIVE_EVENTS(task->thread.debug.dbcr0,
- task->thread.debug.dbcr1)) {
- task->thread.regs->msr &= ~MSR_DE;
- task->thread.debug.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.debug.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..
*
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.debug.dbcr0 & DBCR0_IAC1) != 0);
- int slot2_in_use = ((child->thread.debug.dbcr0 & DBCR0_IAC2) != 0);
- int slot3_in_use = ((child->thread.debug.dbcr0 & DBCR0_IAC3) != 0);
- int slot4_in_use = ((child->thread.debug.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.debug.iac1 = bp_info->addr;
- child->thread.debug.iac2 = bp_info->addr2;
- child->thread.debug.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.debug.iac3 = bp_info->addr;
- child->thread.debug.iac4 = bp_info->addr2;
- child->thread.debug.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.debug.iac1 = bp_info->addr;
- child->thread.debug.dbcr0 |= DBCR0_IAC1;
- goto out;
- }
- }
- if (!slot2_in_use) {
- slot = 2;
- child->thread.debug.iac2 = bp_info->addr;
- child->thread.debug.dbcr0 |= DBCR0_IAC2;
-#if CONFIG_PPC_ADV_DEBUG_IACS > 2
- } else if (!slot3_in_use) {
- slot = 3;
- child->thread.debug.iac3 = bp_info->addr;
- child->thread.debug.dbcr0 |= DBCR0_IAC3;
- } else if (!slot4_in_use) {
- slot = 4;
- child->thread.debug.iac4 = bp_info->addr;
- child->thread.debug.dbcr0 |= DBCR0_IAC4;
-#endif
- } else
- return -ENOSPC;
- }
-out:
- child->thread.debug.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.debug.dbcr0 & DBCR0_IAC1) == 0)
- return -ENOENT;
-
- if (dbcr_iac_range(child) & DBCR_IAC12MODE) {
- /* address range - clear slots 1 & 2 */
- child->thread.debug.iac2 = 0;
- dbcr_iac_range(child) &= ~DBCR_IAC12MODE;
- }
- child->thread.debug.iac1 = 0;
- child->thread.debug.dbcr0 &= ~DBCR0_IAC1;
- break;
- case 2:
- if ((child->thread.debug.dbcr0 & DBCR0_IAC2) == 0)
- return -ENOENT;
-
- if (dbcr_iac_range(child) & DBCR_IAC12MODE)
- /* used in a range */
- return -EINVAL;
- child->thread.debug.iac2 = 0;
- child->thread.debug.dbcr0 &= ~DBCR0_IAC2;
- break;
-#if CONFIG_PPC_ADV_DEBUG_IACS > 2
- case 3:
- if ((child->thread.debug.dbcr0 & DBCR0_IAC3) == 0)
- return -ENOENT;
-
- if (dbcr_iac_range(child) & DBCR_IAC34MODE) {
- /* address range - clear slots 3 & 4 */
- child->thread.debug.iac4 = 0;
- dbcr_iac_range(child) &= ~DBCR_IAC34MODE;
- }
- child->thread.debug.iac3 = 0;
- child->thread.debug.dbcr0 &= ~DBCR0_IAC3;
- break;
- case 4:
- if ((child->thread.debug.dbcr0 & DBCR0_IAC4) == 0)
- return -ENOENT;
-
- if (dbcr_iac_range(child) & DBCR_IAC34MODE)
- /* Used in a range */
- return -EINVAL;
- child->thread.debug.iac4 = 0;
- child->thread.debug.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.debug.dac1 = (unsigned long)bp_info->addr;
-#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
- if (byte_enable) {
- child->thread.debug.dvc1 =
- (unsigned long)bp_info->condition_value;
- child->thread.debug.dbcr2 |=
- ((byte_enable << DBCR2_DVC1BE_SHIFT) |
- (condition_mode << DBCR2_DVC1M_SHIFT));
- }
-#endif
-#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
- } else if (child->thread.debug.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.debug.dac2 = (unsigned long)bp_info->addr;
-#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
- if (byte_enable) {
- child->thread.debug.dvc2 =
- (unsigned long)bp_info->condition_value;
- child->thread.debug.dbcr2 |=
- ((byte_enable << DBCR2_DVC2BE_SHIFT) |
- (condition_mode << DBCR2_DVC2M_SHIFT));
- }
-#endif
- } else
- return -ENOSPC;
- child->thread.debug.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.debug.dac1 = 0;
- dbcr_dac(child) &= ~(DBCR_DAC1R | DBCR_DAC1W);
-#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
- if (child->thread.debug.dbcr2 & DBCR2_DAC12MODE) {
- child->thread.debug.dac2 = 0;
- child->thread.debug.dbcr2 &= ~DBCR2_DAC12MODE;
- }
- child->thread.debug.dbcr2 &= ~(DBCR2_DVC1M | DBCR2_DVC1BE);
-#endif
-#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
- child->thread.debug.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.debug.dbcr2 & DBCR2_DAC12MODE)
- /* Part of a range */
- return -EINVAL;
- child->thread.debug.dbcr2 &= ~(DBCR2_DVC2M | DBCR2_DVC2BE);
-#endif
-#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
- child->thread.debug.dvc2 = 0;
-#endif
- child->thread.debug.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.debug.dbcr0 &
- (DBCR0_DAC1R | DBCR0_DAC1W | DBCR0_DAC2R | DBCR0_DAC2W))
- return -ENOSPC;
-
- if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
- child->thread.debug.dbcr0 |= (DBCR0_DAC1R | DBCR0_IDM);
- if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
- child->thread.debug.dbcr0 |= (DBCR0_DAC1W | DBCR0_IDM);
- child->thread.debug.dac1 = bp_info->addr;
- child->thread.debug.dac2 = bp_info->addr2;
- if (mode == PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE)
- child->thread.debug.dbcr2 |= DBCR2_DAC12M;
- else if (mode == PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE)
- child->thread.debug.dbcr2 |= DBCR2_DAC12MX;
- else /* PPC_BREAKPOINT_MODE_MASK */
- child->thread.debug.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
- struct arch_hw_breakpoint brk;
-#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;
-
- brk.address = bp_info->addr & ~HW_BREAKPOINT_ALIGN;
- brk.type = HW_BRK_TYPE_TRANSLATE;
- brk.len = DABR_MAX_LEN;
- if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
- brk.type |= HW_BRK_TYPE_READ;
- if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
- brk.type |= HW_BRK_TYPE_WRITE;
-#ifdef CONFIG_HAVE_HW_BREAKPOINT
- 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)
- len = 1;
- else
- return -EINVAL;
- bp = thread->ptrace_bps[0];
- if (bp)
- 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;
- attr.bp_len = len;
- arch_bp_generic_fields(brk.type, &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;
- return PTR_ERR(bp);
- }
-
- return 1;
-#endif /* CONFIG_HAVE_HW_BREAKPOINT */
-
- if (bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT)
- return -EINVAL;
-
- if (child->thread.hw_brk.address)
- return -ENOSPC;
-
- if (!ppc_breakpoint_available())
- return -ENODEV;
-
- child->thread.hw_brk = brk;
-
- 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.debug.dbcr0,
- child->thread.debug.dbcr1)) {
- child->thread.debug.dbcr0 &= ~DBCR0_IDM;
- child->thread.regs->msr &= ~MSR_DE;
- }
- }
- return rc;
-#else
- if (data != 1)
- return -EINVAL;
-
-#ifdef CONFIG_HAVE_HW_BREAKPOINT
- bp = thread->ptrace_bps[0];
- if (bp) {
- unregister_hw_breakpoint(bp);
- thread->ptrace_bps[0] = NULL;
- } else
- ret = -ENOENT;
- return ret;
-#else /* CONFIG_HAVE_HW_BREAKPOINT */
- if (child->thread.hw_brk.address == 0)
- return -ENOENT;
-
- child->thread.hw_brk.address = 0;
- child->thread.hw_brk.type = 0;
-#endif /* CONFIG_HAVE_HW_BREAKPOINT */
-
- return 0;
-#endif
-}
-
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
projects / linux-2.6-microblaze.git / blobdiff