tile: avoid undefined behavior with regs[TREG_TP] etc

[cascardo/linux.git] / arch / tile / include / uapi / asm / ptrace.h

diff --git a/arch/tile/include/uapi/asm/ptrace.h b/arch/tile/include/uapi/asm/ptrace.h
index 7757e19..d03b829 100644 (file)
--- a/arch/tile/include/uapi/asm/ptrace.h
+++ b/arch/tile/include/uapi/asm/ptrace.h
@@ -52,12 +52,16 @@ typedef uint_reg_t pt_reg_t;
  * system call or exception.  "struct sigcontext" has the same shape.
  */
 struct pt_regs {
-       /* Saved main processor registers; 56..63 are special. */
-       /* tp, sp, and lr must immediately follow regs[] for aliasing. */
-       pt_reg_t regs[53];
-       pt_reg_t tp;            /* aliases regs[TREG_TP] */
-       pt_reg_t sp;            /* aliases regs[TREG_SP] */
-       pt_reg_t lr;            /* aliases regs[TREG_LR] */
+       union {
+               /* Saved main processor registers; 56..63 are special. */
+               pt_reg_t regs[56];
+               struct {
+                       pt_reg_t __regs[53];
+                       pt_reg_t tp;            /* aliases regs[TREG_TP] */
+                       pt_reg_t sp;            /* aliases regs[TREG_SP] */
+                       pt_reg_t lr;            /* aliases regs[TREG_LR] */
+               };
+       };
 
        /* Saved special registers. */
        pt_reg_t pc;            /* stored in EX_CONTEXT_K_0 */