Restrict matching add/sub sp, #imm

[external/binutils.git] / gdb / arm-tdep.c

diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index 8cc60a4..6b1cf3c 100644 (file)
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -737,16 +737,11 @@ thumb_analyze_prologue (struct gdbarch *gdbarch,
                pv_area_store (stack, regs[ARM_SP_REGNUM], 4, regs[regno]);
              }
        }
-      else if ((insn & 0xff00) == 0xb000)      /* add sp, #simm  OR  
-                                                  sub sp, #simm */
+      else if ((insn & 0xff80) == 0xb080)      /* sub sp, #imm */
        {
          offset = (insn & 0x7f) << 2;          /* get scaled offset */
-         if (insn & 0x80)                      /* Check for SUB.  */
-           regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM],
-                                                  -offset);
-         else
-           regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM],
-                                                  offset);
+         regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM],
+                                                -offset);
        }
       else if ((insn & 0xf800) == 0xa800)      /* add Rd, sp, #imm */
        regs[bits (insn, 8, 10)] = pv_add_constant (regs[ARM_SP_REGNUM],
@@ -3264,7 +3259,7 @@ thumb_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
        found_return = 1;
       else if (insn == 0x46bd)  /* mov sp, r7 */
        found_stack_adjust = 1;
-      else if ((insn & 0xff00) == 0xb000)  /* add sp, imm or sub sp, imm  */
+      else if ((insn & 0xff80) == 0xb000)  /* add sp, imm */
        found_stack_adjust = 1;
       else if ((insn & 0xfe00) == 0xbc00)  /* pop <registers> */
        {
@@ -3324,7 +3319,7 @@ thumb_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
 
       if (insn2 == 0x46bd)  /* mov sp, r7 */
        found_stack_adjust = 1;
-      else if ((insn2 & 0xff00) == 0xb000)  /* add sp, imm or sub sp, imm  */
+      else if ((insn2 & 0xff80) == 0xb000)  /* add sp, imm */
        found_stack_adjust = 1;
       else if ((insn2 & 0xff00) == 0xbc00)  /* pop <registers> without PC */
        found_stack_adjust = 1;