diff options
| -rw-r--r-- | arch/powerpc/kernel/ptrace/Makefile | 4 | ||||
| -rw-r--r-- | arch/powerpc/kernel/ptrace/ptrace-adv.c | 468 | ||||
| -rw-r--r-- | arch/powerpc/kernel/ptrace/ptrace-decl.h | 5 | ||||
| -rw-r--r-- | arch/powerpc/kernel/ptrace/ptrace-noadv.c | 232 | ||||
| -rw-r--r-- | arch/powerpc/kernel/ptrace/ptrace.c | 650 |
5 files changed, 709 insertions, 650 deletions
diff --git a/arch/powerpc/kernel/ptrace/Makefile b/arch/powerpc/kernel/ptrace/Makefile index 7addc5994bb9..e9d97c2d063e 100644 --- a/arch/powerpc/kernel/ptrace/Makefile +++ b/arch/powerpc/kernel/ptrace/Makefile @@ -14,3 +14,7 @@ endif obj-$(CONFIG_ALTIVEC) += ptrace-altivec.o obj-$(CONFIG_SPE) += ptrace-spe.o obj-$(CONFIG_PPC_TRANSACTIONAL_MEM) += ptrace-tm.o +obj-$(CONFIG_PPC_ADV_DEBUG_REGS) += ptrace-adv.o +ifneq ($(CONFIG_PPC_ADV_DEBUG_REGS),y) +obj-y += ptrace-noadv.o +endif diff --git a/arch/powerpc/kernel/ptrace/ptrace-adv.c b/arch/powerpc/kernel/ptrace/ptrace-adv.c new file mode 100644 index 000000000000..eebcd41edc3d --- /dev/null +++ b/arch/powerpc/kernel/ptrace/ptrace-adv.c @@ -0,0 +1,468 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <linux/regset.h> +#include <linux/hw_breakpoint.h> + +#include "ptrace-decl.h" + +void user_enable_single_step(struct task_struct *task) +{ + struct pt_regs *regs = task->thread.regs; + + if (regs != NULL) { + task->thread.debug.dbcr0 &= ~DBCR0_BT; + task->thread.debug.dbcr0 |= DBCR0_IDM | DBCR0_IC; + regs->msr |= MSR_DE; + } + 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) { + task->thread.debug.dbcr0 &= ~DBCR0_IC; + task->thread.debug.dbcr0 = DBCR0_IDM | DBCR0_BT; + regs->msr |= MSR_DE; + } + 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) { + /* + * 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; + } + } + clear_tsk_thread_flag(task, TIF_SINGLESTEP); +} + +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; + + /* 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; + return 0; +} + +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; +} + +#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 */ + +long ppc_set_hwdebug(struct task_struct *child, struct ppc_hw_breakpoint *bp_info) +{ + if (bp_info->version != 1) + return -ENOTSUPP; + /* + * 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 +} + +long ppc_del_hwdebug(struct task_struct *child, long data) +{ + 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; +} diff --git a/arch/powerpc/kernel/ptrace/ptrace-decl.h b/arch/powerpc/kernel/ptrace/ptrace-decl.h index e12f6615fc1d..bdba09a87aea 100644 --- a/arch/powerpc/kernel/ptrace/ptrace-decl.h +++ b/arch/powerpc/kernel/ptrace/ptrace-decl.h @@ -174,3 +174,8 @@ int tm_cgpr32_set(struct task_struct *target, const struct user_regset *regset, /* ptrace-view */ extern const struct user_regset_view user_ppc_native_view; + +/* ptrace-(no)adv */ +int ptrace_set_debugreg(struct task_struct *task, unsigned long addr, unsigned long data); +long ppc_set_hwdebug(struct task_struct *child, struct ppc_hw_breakpoint *bp_info); +long ppc_del_hwdebug(struct task_struct *child, long data); diff --git a/arch/powerpc/kernel/ptrace/ptrace-noadv.c b/arch/powerpc/kernel/ptrace/ptrace-noadv.c new file mode 100644 index 000000000000..d4170932acb4 --- /dev/null +++ b/arch/powerpc/kernel/ptrace/ptrace-noadv.c @@ -0,0 +1,232 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <linux/regset.h> +#include <linux/hw_breakpoint.h> + +#include <asm/debug.h> + +#include "ptrace-decl.h" + +void user_enable_single_step(struct task_struct *task) +{ + struct pt_regs *regs = task->thread.regs; + + if (regs != NULL) { + regs->msr &= ~MSR_BE; + regs->msr |= MSR_SE; + } + 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) { + regs->msr &= ~MSR_SE; + regs->msr |= MSR_BE; + } + 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) + regs->msr &= ~(MSR_SE | MSR_BE); + + clear_tsk_thread_flag(task, TIF_SINGLESTEP); +} + +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 */ + bool set_bp = true; + struct arch_hw_breakpoint hw_brk; + + /* 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; + + /* 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; + return 0; +} + +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 */ + struct arch_hw_breakpoint brk; + + if (bp_info->version != 1) + return -ENOTSUPP; + /* + * 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); + + bp = register_user_hw_breakpoint(&attr, ptrace_triggered, NULL, child); + thread->ptrace_bps[0] = bp; + 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; +} + +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 */ + 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; +} diff --git a/arch/powerpc/kernel/ptrace/ptrace.c b/arch/powerpc/kernel/ptrace/ptrace.c index 95e66dad32e0..48e095e88a2f 100644 --- a/arch/powerpc/kernel/ptrace/ptrace.c +++ b/arch/powerpc/kernel/ptrace/ptrace.c @@ -31,71 +31,6 @@ #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) @@ -114,138 +49,6 @@ void ptrace_triggered(struct perf_event *bp, } #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.. * @@ -257,459 +60,6 @@ void ptrace_disable(struct task_struct *child) 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) { |