diff options
Diffstat (limited to 'arch/powerpc/kernel/ptrace.c')
| -rw-r--r-- | arch/powerpc/kernel/ptrace.c | 232 |
1 files changed, 196 insertions, 36 deletions
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c index 2a9fe97e452..3635be61f89 100644 --- a/arch/powerpc/kernel/ptrace.c +++ b/arch/powerpc/kernel/ptrace.c @@ -22,6 +22,7 @@ #include <linux/errno.h> #include <linux/ptrace.h> #include <linux/regset.h> +#include <linux/tracehook.h> #include <linux/elf.h> #include <linux/user.h> #include <linux/security.h> @@ -215,29 +216,56 @@ static int fpr_get(struct task_struct *target, const struct user_regset *regset, unsigned int pos, unsigned int count, void *kbuf, void __user *ubuf) { +#ifdef CONFIG_VSX + double buf[33]; + int i; +#endif flush_fp_to_thread(target); +#ifdef CONFIG_VSX + /* copy to local buffer then write that out */ + for (i = 0; i < 32 ; i++) + buf[i] = target->thread.TS_FPR(i); + memcpy(&buf[32], &target->thread.fpscr, sizeof(double)); + return user_regset_copyout(&pos, &count, &kbuf, &ubuf, buf, 0, -1); + +#else BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) != - offsetof(struct thread_struct, fpr[32])); + offsetof(struct thread_struct, TS_FPR(32))); return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &target->thread.fpr, 0, -1); +#endif } static int fpr_set(struct task_struct *target, const struct user_regset *regset, unsigned int pos, unsigned int count, const void *kbuf, const void __user *ubuf) { +#ifdef CONFIG_VSX + double buf[33]; + int i; +#endif flush_fp_to_thread(target); +#ifdef CONFIG_VSX + /* copy to local buffer then write that out */ + i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1); + if (i) + return i; + for (i = 0; i < 32 ; i++) + target->thread.TS_FPR(i) = buf[i]; + memcpy(&target->thread.fpscr, &buf[32], sizeof(double)); + return 0; +#else BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) != - offsetof(struct thread_struct, fpr[32])); + offsetof(struct thread_struct, TS_FPR(32))); return user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.fpr, 0, -1); +#endif } - #ifdef CONFIG_ALTIVEC /* * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go. @@ -323,6 +351,56 @@ static int vr_set(struct task_struct *target, const struct user_regset *regset, } #endif /* CONFIG_ALTIVEC */ +#ifdef CONFIG_VSX +/* + * Currently to set and and get all the vsx state, you need to call + * the fp and VMX calls aswell. This only get/sets the lower 32 + * 128bit VSX registers. + */ + +static int vsr_active(struct task_struct *target, + const struct user_regset *regset) +{ + flush_vsx_to_thread(target); + return target->thread.used_vsr ? regset->n : 0; +} + +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; + + flush_vsx_to_thread(target); + + 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 /* @@ -399,6 +477,9 @@ enum powerpc_regset { #ifdef CONFIG_ALTIVEC REGSET_VMX, #endif +#ifdef CONFIG_VSX + REGSET_VSX, +#endif #ifdef CONFIG_SPE REGSET_SPE, #endif @@ -422,6 +503,13 @@ static const struct user_regset native_regsets[] = { .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, @@ -616,7 +704,7 @@ void user_enable_single_step(struct task_struct *task) if (regs != NULL) { #if defined(CONFIG_40x) || defined(CONFIG_BOOKE) - task->thread.dbcr0 = DBCR0_IDM | DBCR0_IC; + task->thread.dbcr0 |= DBCR0_IDM | DBCR0_IC; regs->msr |= MSR_DE; #else regs->msr |= MSR_SE; @@ -629,9 +717,16 @@ void user_disable_single_step(struct task_struct *task) { struct pt_regs *regs = task->thread.regs; + +#if defined(CONFIG_BOOKE) + /* If DAC then do not single step, skip */ + if (task->thread.dabr) + return; +#endif + if (regs != NULL) { #if defined(CONFIG_40x) || defined(CONFIG_BOOKE) - task->thread.dbcr0 = 0; + task->thread.dbcr0 &= ~(DBCR0_IC | DBCR0_IDM); regs->msr &= ~MSR_DE; #else regs->msr &= ~MSR_SE; @@ -640,22 +735,76 @@ void user_disable_single_step(struct task_struct *task) clear_tsk_thread_flag(task, TIF_SINGLESTEP); } -static int ptrace_set_debugreg(struct task_struct *task, unsigned long addr, +int ptrace_set_debugreg(struct task_struct *task, unsigned long addr, unsigned long data) { - /* We only support one DABR and no IABRS at the moment */ + /* 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 are flags */ + /* The bottom 3 bits in dabr are flags */ if ((data & ~0x7UL) >= TASK_SIZE) return -EIO; - /* Ensure translation is on */ +#ifndef CONFIG_BOOKE + + /* 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; + /* Move contents to the DABR register */ task->thread.dabr = data; + +#endif +#if defined(CONFIG_BOOKE) + + /* 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.dabr = data & ~0x3UL; + + if (task->thread.dabr == 0) { + task->thread.dbcr0 &= ~(DBSR_DAC1R | DBSR_DAC1W | DBCR0_IDM); + task->thread.regs->msr &= ~MSR_DE; + 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 */ + if (data & 0x1UL) + task->thread.dbcr0 |= DBSR_DAC1R; + if (data & 0x2UL) + task->thread.dbcr0 |= DBSR_DAC1W; + + task->thread.regs->msr |= MSR_DE; +#endif return 0; } @@ -728,7 +877,8 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) tmp = ptrace_get_reg(child, (int) index); } else { flush_fp_to_thread(child); - tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0]; + tmp = ((unsigned long *)child->thread.fpr) + [TS_FPRWIDTH * (index - PT_FPR0)]; } ret = put_user(tmp,(unsigned long __user *) data); break; @@ -755,7 +905,8 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) ret = ptrace_put_reg(child, index, data); } else { flush_fp_to_thread(child); - ((unsigned long *)child->thread.fpr)[index - PT_FPR0] = data; + ((unsigned long *)child->thread.fpr) + [TS_FPRWIDTH * (index - PT_FPR0)] = data; ret = 0; } break; @@ -820,6 +971,19 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) sizeof(u32)), (const void __user *) data); #endif +#ifdef CONFIG_VSX + case PTRACE_GETVSRREGS: + return copy_regset_to_user(child, &user_ppc_native_view, + REGSET_VSX, + 0, 32 * sizeof(double), + (void __user *) data); + + case PTRACE_SETVSRREGS: + return copy_regset_from_user(child, &user_ppc_native_view, + REGSET_VSX, + 0, 32 * sizeof(double), + (const void __user *) data); +#endif #ifdef CONFIG_SPE case PTRACE_GETEVRREGS: /* Get the child spe register state. */ @@ -849,31 +1013,24 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) return ret; } -static void do_syscall_trace(void) +/* + * 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) { - /* the 0x80 provides a way for the tracing parent to distinguish - between a syscall stop and SIGTRAP delivery */ - ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) - ? 0x80 : 0)); - - /* - * this isn't the same as continuing with a signal, but it will do - * for normal use. strace only continues with a signal if the - * stopping signal is not SIGTRAP. -brl - */ - if (current->exit_code) { - send_sig(current->exit_code, current, 1); - current->exit_code = 0; - } -} + long ret = 0; -void do_syscall_trace_enter(struct pt_regs *regs) -{ secure_computing(regs->gpr[0]); - if (test_thread_flag(TIF_SYSCALL_TRACE) - && (current->ptrace & PT_PTRACED)) - do_syscall_trace(); + 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(current->audit_context)) { #ifdef CONFIG_PPC64 @@ -891,16 +1048,19 @@ void do_syscall_trace_enter(struct pt_regs *regs) regs->gpr[5] & 0xffffffff, regs->gpr[6] & 0xffffffff); } + + return ret ?: regs->gpr[0]; } void do_syscall_trace_leave(struct pt_regs *regs) { + int step; + if (unlikely(current->audit_context)) audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS, regs->result); - if ((test_thread_flag(TIF_SYSCALL_TRACE) - || test_thread_flag(TIF_SINGLESTEP)) - && (current->ptrace & PT_PTRACED)) - do_syscall_trace(); + step = test_thread_flag(TIF_SINGLESTEP); + if (step || test_thread_flag(TIF_SYSCALL_TRACE)) + tracehook_report_syscall_exit(regs, step); } |