[NDS32] Support dwarf exception handling.

[thirdparty/gcc.git] / gcc / config / nds32 / nds32-md-auxiliary.c

diff --git a/gcc/config/nds32/nds32-md-auxiliary.c b/gcc/config/nds32/nds32-md-auxiliary.c
index 01ce38b5980a1ae89d48f7be9b01f6c8ed38a64e..95bd82969abb860fe7b19aa3dad4fa37fe6929ed 100644 (file)
--- a/gcc/config/nds32/nds32-md-auxiliary.c
+++ b/gcc/config/nds32/nds32-md-auxiliary.c
@@ -1712,6 +1712,10 @@ nds32_output_stack_push (rtx par_rtx)
   int last_argument_regno = NDS32_FIRST_GPR_REGNUM
                            + NDS32_MAX_GPR_REGS_FOR_ARGS
                            - 1;
+  /* Pick up first and last eh data regno for further use.  */
+  int rb_eh_data = cfun->machine->eh_return_data_first_regno;
+  int re_eh_data = cfun->machine->eh_return_data_last_regno;
+  int first_eh_data_regno = EH_RETURN_DATA_REGNO (0);
   /* Pick up callee-saved first regno and last regno for further use.  */
   int rb_callee_saved = cfun->machine->callee_saved_first_gpr_regno;
   int re_callee_saved = cfun->machine->callee_saved_last_gpr_regno;
@@ -1731,6 +1735,22 @@ nds32_output_stack_push (rtx par_rtx)
       return "";
     }
 
+  /* If last_argument_regno is not mentioned in par_rtx, we can confirm that
+     we do not need to push argument registers for variadic function.
+     But we still need to check if we need to push exception handling
+     data registers.  */
+  if (reg_mentioned_p (gen_rtx_REG (SImode, first_eh_data_regno), par_rtx))
+    {
+      /* Set operands[0] and operands[1].  */
+      operands[0] = gen_rtx_REG (SImode, rb_eh_data);
+      operands[1] = gen_rtx_REG (SImode, re_eh_data);
+      /* Create assembly code pattern: "Rb, Re, { }".  */
+      snprintf (pattern, sizeof (pattern), "push.s\t%s", "%0, %1, { }");
+      /* We use output_asm_insn() to output assembly code by ourself.  */
+      output_asm_insn (pattern, operands);
+      return "";
+    }
+
   /* If we step here, we are going to do v3push or multiple push operation.  */
 
   /* The v3push/v3pop instruction should only be applied on
@@ -1833,10 +1853,28 @@ nds32_output_stack_pop (rtx par_rtx ATTRIBUTE_UNUSED)
   char pattern[100];
   /* The operands array which will be used in output_asm_insn().  */
   rtx operands[3];
+  /* Pick up first and last eh data regno for further use.  */
+  int rb_eh_data = cfun->machine->eh_return_data_first_regno;
+  int re_eh_data = cfun->machine->eh_return_data_last_regno;
+  int first_eh_data_regno = EH_RETURN_DATA_REGNO (0);
   /* Pick up callee-saved first regno and last regno for further use.  */
   int rb_callee_saved = cfun->machine->callee_saved_first_gpr_regno;
   int re_callee_saved = cfun->machine->callee_saved_last_gpr_regno;
 
+  /* We need to check if we need to push exception handling
+     data registers.  */
+  if (reg_mentioned_p (gen_rtx_REG (SImode, first_eh_data_regno), par_rtx))
+    {
+      /* Set operands[0] and operands[1].  */
+      operands[0] = gen_rtx_REG (SImode, rb_eh_data);
+      operands[1] = gen_rtx_REG (SImode, re_eh_data);
+      /* Create assembly code pattern: "Rb, Re, { }".  */
+      snprintf (pattern, sizeof (pattern), "pop.s\t%s", "%0, %1, { }");
+      /* We use output_asm_insn() to output assembly code by ourself.  */
+      output_asm_insn (pattern, operands);
+      return "";
+    }
+
   /* If we step here, we are going to do v3pop or multiple pop operation.  */
 
   /* The v3push/v3pop instruction should only be applied on