powerpc: Add macros to access floating point registers in thread_struct.

[linux-2.6-omap-h63xx.git] / arch / powerpc / kernel / ptrace32.c

diff --git a/arch/powerpc/kernel/ptrace32.c b/arch/powerpc/kernel/ptrace32.c
index 4c1de6af4c092da35128e6ae553af27a3dcb9baf..67bf1a1e7e1442f7a3ab9485fc2d95ad17a543f7 100644 (file)
--- a/arch/powerpc/kernel/ptrace32.c
+++ b/arch/powerpc/kernel/ptrace32.c
@@ -64,6 +64,11 @@ static long compat_ptrace_old(struct task_struct *child, long request,
        return -EPERM;
 }
 
+/* Macros to workout the correct index for the FPR in the thread struct */
+#define FPRNUMBER(i) (((i) - PT_FPR0) >> 1)
+#define FPRHALF(i) (((i) - PT_FPR0) & 1)
+#define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) + FPRHALF(i)
+
 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
                        compat_ulong_t caddr, compat_ulong_t cdata)
 {
@@ -122,7 +127,8 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
                         * to be an array of unsigned int (32 bits) - the
                         * index passed in is based on this assumption.
                         */
-                       tmp = ((unsigned int *)child->thread.fpr)[index - PT_FPR0];
+                       tmp = ((unsigned int *)child->thread.fpr)
+                               [FPRINDEX(index)];
                }
                ret = put_user((unsigned int)tmp, (u32 __user *)data);
                break;
@@ -162,7 +168,8 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
                CHECK_FULL_REGS(child->thread.regs);
                if (numReg >= PT_FPR0) {
                        flush_fp_to_thread(child);
-                       tmp = ((unsigned long int *)child->thread.fpr)[numReg - PT_FPR0];
+                       tmp = ((unsigned long int *)child->thread.fpr)
+                               [FPRINDEX(numReg)];
                } else { /* register within PT_REGS struct */
                        tmp = ptrace_get_reg(child, numReg);
                } 
@@ -217,7 +224,8 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
                         * to be an array of unsigned int (32 bits) - the
                         * index passed in is based on this assumption.
                         */
-                       ((unsigned int *)child->thread.fpr)[index - PT_FPR0] = data;
+                       ((unsigned int *)child->thread.fpr)
+                               [FPRINDEX(index)] = data;
                        ret = 0;
                }
                break;