1 files changed, 218 insertions, 107 deletions

diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index bf76562167c3..0fb53950da43 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -35,11 +35,11 @@
 #include <asm/pgtable.h>
 #include <asm/system.h>
 
-#ifdef CONFIG_PPC64
-#include "ptrace-common.h"
-#endif
+/*
+ * does not yet catch signals sent when the child dies.
+ * in exit.c or in signal.c.
+ */
 
-#ifdef CONFIG_PPC32
 /*
  * Set of msr bits that gdb can change on behalf of a process.
  */
@@ -48,65 +48,117 @@
 #else
 #define MSR_DEBUGCHANGE (MSR_SE | MSR_BE)
 #endif
-#endif /* CONFIG_PPC32 */
 
 /*
- * does not yet catch signals sent when the child dies.
- * in exit.c or in signal.c.
+ * Max register writeable via put_reg
  */
-
 #ifdef CONFIG_PPC32
+#define PT_MAX_PUT_REG  PT_MQ
+#else
+#define PT_MAX_PUT_REG  PT_CCR
+#endif
+
 /*
  * Get contents of register REGNO in task TASK.
  */
-static inline unsigned long get_reg(struct task_struct *task, int regno)
+unsigned long ptrace_get_reg(struct task_struct *task, int regno)
 {
-        if (regno < sizeof(struct pt_regs) / sizeof(unsigned long)
-            && task->thread.regs != NULL)
+        unsigned long tmp = 0;
+
+        if (task->thread.regs == NULL)
+                return -EIO;
+
+        if (regno == PT_MSR) {
+                tmp = ((unsigned long *)task->thread.regs)[PT_MSR];
+                return tmp | task->thread.fpexc_mode;
+        }
+
+        if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long)))
                 return ((unsigned long *)task->thread.regs)[regno];
-        return (0);
+
+        return -EIO;
 }
 
 /*
  * Write contents of register REGNO in task TASK.
  */
-static inline int put_reg(struct task_struct *task, int regno,
-                          unsigned long data)
+int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
 {
-        if (regno <= PT_MQ && task->thread.regs != NULL) {
+        if (task->thread.regs == NULL)
+                return -EIO;
+
+        if (regno <= PT_MAX_PUT_REG || regno == PT_TRAP) {
                 if (regno == PT_MSR)
                         data = (data & MSR_DEBUGCHANGE)
                                 | (task->thread.regs->msr & ~MSR_DEBUGCHANGE);
+                /* We prevent mucking around with the reserved area of trap
+                 * which are used internally by the kernel
+                 */
+                if (regno == PT_TRAP)
+                        data &= 0xfff0;
                 ((unsigned long *)task->thread.regs)[regno] = data;
                 return 0;
         }
         return -EIO;
 }
 
+
+static int get_fpregs(void __user *data, struct task_struct *task,
+                      int has_fpscr)
+{
+        unsigned int count = has_fpscr ? 33 : 32;
+
+        if (copy_to_user(data, task->thread.fpr, count * sizeof(double)))
+                return -EFAULT;
+        return 0;
+}
+
+static int set_fpregs(void __user *data, struct task_struct *task,
+                      int has_fpscr)
+{
+        unsigned int count = has_fpscr ? 33 : 32;
+
+        if (copy_from_user(task->thread.fpr, data, count * sizeof(double)))
+                return -EFAULT;
+        return 0;
+}
+
+
 #ifdef CONFIG_ALTIVEC
 /*
+ * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
+ * The transfer totals 34 quadword.  Quadwords 0-31 contain the
+ * corresponding vector registers.  Quadword 32 contains the vscr as the
+ * last word (offset 12) within that quadword.  Quadword 33 contains the
+ * vrsave as the first word (offset 0) within the quadword.
+ *
+ * This definition of the VMX state is compatible with the current PPC32
+ * ptrace interface.  This allows signal handling and ptrace to use the
+ * same structures.  This also simplifies the implementation of a bi-arch
+ * (combined (32- and 64-bit) gdb.
+ */
+
+/*
  * Get contents of AltiVec register state in task TASK
  */
-static inline int get_vrregs(unsigned long __user *data, struct task_struct *task)
+static int get_vrregs(unsigned long __user *data, struct task_struct *task)
 {
-        int i, j;
-
-        if (!access_ok(VERIFY_WRITE, data, 133 * sizeof(unsigned long)))
-                return -EFAULT;
+        unsigned long regsize;
 
         /* copy AltiVec registers VR[0] .. VR[31] */
-        for (i = 0; i < 32; i++)
-                for (j = 0; j < 4; j++, data++)
-                        if (__put_user(task->thread.vr[i].u[j], data))
-                                return -EFAULT;
+        regsize = 32 * sizeof(vector128);
+        if (copy_to_user(data, task->thread.vr, regsize))
+                return -EFAULT;
+        data += (regsize / sizeof(unsigned long));
 
         /* copy VSCR */
-        for (i = 0; i < 4; i++, data++)
-                if (__put_user(task->thread.vscr.u[i], data))
-                        return -EFAULT;
+        regsize = 1 * sizeof(vector128);
+        if (copy_to_user(data, &task->thread.vscr, regsize))
+                return -EFAULT;
+        data += (regsize / sizeof(unsigned long));
 
-        /* copy VRSAVE */
-        if (__put_user(task->thread.vrsave, data))
+        /* copy VRSAVE */
+        if (put_user(task->thread.vrsave, (u32 __user *)data))
                 return -EFAULT;
 
         return 0;
@@ -115,31 +167,29 @@ static inline int get_vrregs(unsigned long __user *data, struct task_struct *tas
 /*
  * Write contents of AltiVec register state into task TASK.
  */
-static inline int set_vrregs(struct task_struct *task, unsigned long __user *data)
+static int set_vrregs(struct task_struct *task, unsigned long __user *data)
 {
-        int i, j;
-
-        if (!access_ok(VERIFY_READ, data, 133 * sizeof(unsigned long)))
-                return -EFAULT;
+        unsigned long regsize;
 
         /* copy AltiVec registers VR[0] .. VR[31] */
-        for (i = 0; i < 32; i++)
-                for (j = 0; j < 4; j++, data++)
-                        if (__get_user(task->thread.vr[i].u[j], data))
-                                return -EFAULT;
+        regsize = 32 * sizeof(vector128);
+        if (copy_from_user(task->thread.vr, data, regsize))
+                return -EFAULT;
+        data += (regsize / sizeof(unsigned long));
 
         /* copy VSCR */
-        for (i = 0; i < 4; i++, data++)
-                if (__get_user(task->thread.vscr.u[i], data))
-                        return -EFAULT;
+        regsize = 1 * sizeof(vector128);
+        if (copy_from_user(&task->thread.vscr, data, regsize))
+                return -EFAULT;
+        data += (regsize / sizeof(unsigned long));
 
         /* copy VRSAVE */
-        if (__get_user(task->thread.vrsave, data))
+        if (get_user(task->thread.vrsave, (u32 __user *)data))
                 return -EFAULT;
 
         return 0;
 }
-#endif
+#endif /* CONFIG_ALTIVEC */
 
 #ifdef CONFIG_SPE
 
@@ -156,7 +206,7 @@ static inline int set_vrregs(struct task_struct *task, unsigned long __user *dat
 /*
  * Get contents of SPE register state in task TASK.
  */
-static inline int get_evrregs(unsigned long *data, struct task_struct *task)
+static int get_evrregs(unsigned long *data, struct task_struct *task)
 {
         int i;
 
@@ -182,7 +232,7 @@ static inline int get_evrregs(unsigned long *data, struct task_struct *task)
 /*
  * Write contents of SPE register state into task TASK.
  */
-static inline int set_evrregs(struct task_struct *task, unsigned long *data)
+static int set_evrregs(struct task_struct *task, unsigned long *data)
 {
         int i;
 
@@ -205,8 +255,8 @@ static inline int set_evrregs(struct task_struct *task, unsigned long *data)
 }
 #endif /* CONFIG_SPE */
 
-static inline void
-set_single_step(struct task_struct *task)
+
+static void set_single_step(struct task_struct *task)
 {
         struct pt_regs *regs = task->thread.regs;
 
@@ -221,8 +271,7 @@ set_single_step(struct task_struct *task)
         set_tsk_thread_flag(task, TIF_SINGLESTEP);
 }
 
-static inline void
-clear_single_step(struct task_struct *task)
+static void clear_single_step(struct task_struct *task)
 {
         struct pt_regs *regs = task->thread.regs;
 
@@ -236,7 +285,25 @@ clear_single_step(struct task_struct *task)
         }
         clear_tsk_thread_flag(task, TIF_SINGLESTEP);
 }
-#endif /* CONFIG_PPC32 */
+
+static 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 */
+        if (addr > 0)
+                return -EINVAL;
+
+        /* The bottom 3 bits are flags */
+        if ((data & ~0x7UL) >= TASK_SIZE)
+                return -EIO;
+
+        /* Ensure translation is on */
+        if (data && !(data & DABR_TRANSLATION))
+                return -EIO;
+
+        task->thread.dabr = data;
+        return 0;
+}
 
 /*
  * Called by kernel/ptrace.c when detaching..
@@ -249,6 +316,62 @@ void ptrace_disable(struct task_struct *child)
         clear_single_step(child);
 }
 
+/*
+ * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
+ * we mark them as obsolete now, they will be removed in a future version
+ */
+static long arch_ptrace_old(struct task_struct *child, long request, long addr,
+                            long data)
+{
+        int ret = -EPERM;
+
+        switch(request) {
+        case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */
+                int i;
+                unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
+                unsigned long __user *tmp = (unsigned long __user *)addr;
+
+                for (i = 0; i < 32; i++) {
+                        ret = put_user(*reg, tmp);
+                        if (ret)
+                                break;
+                        reg++;
+                        tmp++;
+                }
+                break;
+        }
+
+        case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */
+                int i;
+                unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
+                unsigned long __user *tmp = (unsigned long __user *)addr;
+
+                for (i = 0; i < 32; i++) {
+                        ret = get_user(*reg, tmp);
+                        if (ret)
+                                break;
+                        reg++;
+                        tmp++;
+                }
+                break;
+        }
+
+        case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */
+                flush_fp_to_thread(child);
+                ret = get_fpregs((void __user *)addr, child, 0);
+                break;
+        }
+
+        case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
+                flush_fp_to_thread(child);
+                ret = set_fpregs((void __user *)addr, child, 0);
+                break;
+        }
+
+        }
+        return ret;
+}
+
 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 {
         int ret = -EPERM;
@@ -284,11 +407,9 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 #endif
                         break;
 
-#ifdef CONFIG_PPC32
                 CHECK_FULL_REGS(child->thread.regs);
-#endif
                 if (index < PT_FPR0) {
-                        tmp = get_reg(child, (int) index);
+                        tmp = ptrace_get_reg(child, (int) index);
                 } else {
                         flush_fp_to_thread(child);
                         tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0];
@@ -323,13 +444,9 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 #endif
                         break;
 
-#ifdef CONFIG_PPC32
                 CHECK_FULL_REGS(child->thread.regs);
-#endif
-                if (index == PT_ORIG_R3)
-                        break;
                 if (index < PT_FPR0) {
-                        ret = put_reg(child, index, data);
+                        ret = ptrace_put_reg(child, index, data);
                 } else {
                         flush_fp_to_thread(child);
                         ((unsigned long *)child->thread.fpr)[index - PT_FPR0] = data;
@@ -384,7 +501,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                 break;
         }
 
-#ifdef CONFIG_PPC64
         case PTRACE_GET_DEBUGREG: {
                 ret = -EINVAL;
                 /* We only support one DABR and no IABRS at the moment */
@@ -398,73 +514,61 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
         case PTRACE_SET_DEBUGREG:
                 ret = ptrace_set_debugreg(child, addr, data);
                 break;
-#endif
 
         case PTRACE_DETACH:
                 ret = ptrace_detach(child, data);
                 break;
 
-        case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */
-                int i;
-                unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
-                unsigned long __user *tmp = (unsigned long __user *)addr;
-
-                for (i = 0; i < 32; i++) {
-                        ret = put_user(*reg, tmp);
-                        if (ret)
-                                break;
-                        reg++;
-                        tmp++;
+#ifdef CONFIG_PPC64
+        case PTRACE_GETREGS64:
+#endif
+        case PTRACE_GETREGS: { /* Get all pt_regs from the child. */
+                int ui;
+                if (!access_ok(VERIFY_WRITE, (void __user *)data,
+                               sizeof(struct pt_regs))) {
+                        ret = -EIO;
+                        break;
+                }
+                ret = 0;
+                for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
+                        ret |= __put_user(ptrace_get_reg(child, ui),
+                                          (unsigned long __user *) data);
+                        data += sizeof(long);
                 }
                 break;
         }
 
-        case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */
-                int i;
-                unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
-                unsigned long __user *tmp = (unsigned long __user *)addr;
-
-                for (i = 0; i < 32; i++) {
-                        ret = get_user(*reg, tmp);
+#ifdef CONFIG_PPC64
+        case PTRACE_SETREGS64:
+#endif
+        case PTRACE_SETREGS: { /* Set all gp regs in the child. */
+                unsigned long tmp;
+                int ui;
+                if (!access_ok(VERIFY_READ, (void __user *)data,
+                               sizeof(struct pt_regs))) {
+                        ret = -EIO;
+                        break;
+                }
+                ret = 0;
+                for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
+                        ret = __get_user(tmp, (unsigned long __user *) data);
                         if (ret)
                                 break;
-                        reg++;
-                        tmp++;
+                        ptrace_put_reg(child, ui, tmp);
+                        data += sizeof(long);
                 }
                 break;
         }
 
-        case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */
-                int i;
-                unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
-                unsigned long __user *tmp = (unsigned long __user *)addr;
-
+        case PTRACE_GETFPREGS: { /* Get the child FPU state (FPR0...31 + FPSCR) */
                 flush_fp_to_thread(child);
-
-                for (i = 0; i < 32; i++) {
-                        ret = put_user(*reg, tmp);
-                        if (ret)
-                                break;
-                        reg++;
-                        tmp++;
-                }
+                ret = get_fpregs((void __user *)data, child, 1);
                 break;
         }
 
-        case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
-                int i;
-                unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
-                unsigned long __user *tmp = (unsigned long __user *)addr;
-
+        case PTRACE_SETFPREGS: { /* Set the child FPU state (FPR0...31 + FPSCR) */
                 flush_fp_to_thread(child);
-
-                for (i = 0; i < 32; i++) {
-                        ret = get_user(*reg, tmp);
-                        if (ret)
-                                break;
-                        reg++;
-                        tmp++;
-                }
+                ret = set_fpregs((void __user *)data, child, 1);
                 break;
         }
 
@@ -499,11 +603,18 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                 break;
 #endif
 
+        /* Old reverse args ptrace callss */
+        case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
+        case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
+        case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
+        case PPC_PTRACE_SETFPREGS: /* Get FPRs 0 - 31. */
+                ret = arch_ptrace_old(child, request, addr, data);
+                break;
+
         default:
                 ret = ptrace_request(child, request, addr, data);
                 break;
         }
-
         return ret;
 }