From: Alexandre Oliva <oliva@libre-soc.org>
Date: Sat, 20 Feb 2021 17:07:48 +0000 (-0300)
Subject: prepare EH machinery for reg renumbering
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6f867a703b8e1c07acc341fb89e118c5c4c08e1b;p=gcc.git

prepare EH machinery for reg renumbering
---

diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h
index c1c95cbf1b7..f8a02c8a850 100644
--- a/gcc/config/rs6000/rs6000.h
+++ b/gcc/config/rs6000/rs6000.h
@@ -839,6 +839,11 @@ enum data_align { align_abi, align_opt, align_both };
 
 #define FIRST_PSEUDO_REGISTER 111
 
+/* The SVP64 registers are not call-saved, so the unwinder doesn't have to deal
+   with them.  If this grows, System.OS_Interface.Alternate_Stack_Size in the
+   Ada runtime needs to grow as well.  */
+#define DWARF_FRAME_REGISTERS 111
+
 /* Use standard DWARF numbering for DWARF debugging information.  */
 #define DBX_REGISTER_NUMBER(REGNO) rs6000_dbx_register_number ((REGNO), 0)
 
diff --git a/libgcc/config/rs6000/aix-unwind.h b/libgcc/config/rs6000/aix-unwind.h
index b8d82765e55..be63f00455a 100644
--- a/libgcc/config/rs6000/aix-unwind.h
+++ b/libgcc/config/rs6000/aix-unwind.h
@@ -28,6 +28,7 @@
 #define R_CR2            70
 #define R_XER            76
 #define R_FIRST_ALTIVEC  77
+#define R_ALT_RET        99
 #define R_VRSAVE        109
 #define R_VSCR          110
 
@@ -202,7 +203,7 @@ ucontext_for (struct _Unwind_Context *context)
 #ifdef __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__
 #define RETURN_COLUMN __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__
 #else
-#define RETURN_COLUMN ARG_POINTER_REGNUM
+#define RETURN_COLUMN R_ALT_RET
 #endif
 
 #define REGISTER_CFA_OFFSET_FOR(FS,REGNO,ADDR,CFA)\
diff --git a/libgcc/config/rs6000/darwin-fallback.c b/libgcc/config/rs6000/darwin-fallback.c
index aa484c02134..72a2470cce7 100644
--- a/libgcc/config/rs6000/darwin-fallback.c
+++ b/libgcc/config/rs6000/darwin-fallback.c
@@ -42,6 +42,7 @@
 #define R_CR2		70
 #define R_XER		76
 #define R_VR0		77
+#define R_AR		99
 #define R_VRSAVE	109
 #define R_VSCR		110
 #define R_SPEFSCR	112
@@ -446,11 +447,11 @@ handle_syscall (_Unwind_FrameState *fs, const reg_unit gprs[32],
      the space it's reserved from is the GCC register space, not the
      DWARF2 numbering.  So any free element of the right size is an OK
      choice.  Thus: */
-  fs->retaddr_column = ARG_POINTER_REGNUM;
+  fs->retaddr_column = R_AR;
   /* FIXME: this should really be done using a DWARF2 location expression,
      not using a static variable.  In fact, this entire file should
      be implemented in DWARF2 expressions.  */
-  set_offset (ARG_POINTER_REGNUM, &return_addr);
+  set_offset (R_AR, &return_addr);
 
   for (i = 0; i < 32; i++)
     set_offset (32 + i, float_vector_state->fpregs + i);
diff --git a/libgcc/config/rs6000/linux-unwind.h b/libgcc/config/rs6000/linux-unwind.h
index acdc948f85d..3454d09d262 100644
--- a/libgcc/config/rs6000/linux-unwind.h
+++ b/libgcc/config/rs6000/linux-unwind.h
@@ -22,13 +22,16 @@
    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    <http://www.gnu.org/licenses/>.  */
 
+#define R_FR0		32
 #define R_LR		65
 #define R_CR2		70
 #define R_CR3		71
 #define R_CR4		72
 #define R_VR0		77
+#define R_AR		99
 #define R_VRSAVE	109
 
+
 #ifdef __powerpc64__
 #if _CALL_ELF == 2
 #define TOC_SAVE_SLOT	24
@@ -239,16 +242,16 @@ ppc_fallback_frame_state (struct _Unwind_Context *context,
   fs->regs.reg[R_LR].how = REG_SAVED_OFFSET;
   fs->regs.reg[R_LR].loc.offset = (long) &regs->link - new_cfa;
 
-  fs->regs.reg[ARG_POINTER_REGNUM].how = REG_SAVED_OFFSET;
-  fs->regs.reg[ARG_POINTER_REGNUM].loc.offset = (long) &regs->nip - new_cfa;
-  fs->retaddr_column = ARG_POINTER_REGNUM;
+  fs->regs.reg[R_AR].how = REG_SAVED_OFFSET;
+  fs->regs.reg[R_AR].loc.offset = (long) &regs->nip - new_cfa;
+  fs->retaddr_column = R_AR;
   fs->signal_frame = 1;
 
   /* If we have a FPU...  */
   for (i = 14; i < 32; i++)
     {
-      fs->regs.reg[i + 32].how = REG_SAVED_OFFSET;
-      fs->regs.reg[i + 32].loc.offset = (long) &regs->fpr[i] - new_cfa;
+      fs->regs.reg[i + R_FR0].how = REG_SAVED_OFFSET;
+      fs->regs.reg[i + R_FR0].loc.offset = (long) &regs->fpr[i] - new_cfa;
     }
 
   /* If we have a VMX unit...  */