From: Julian Seward <jseward@acm.org>
Date: Tue, 17 Jan 2006 01:42:56 +0000 (+0000)
Subject: Give the ppc64 guest state a 16-entry pseudo-register array,
X-Git-Tag: svn/VALGRIND_3_2_3^2~122
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=4364bd7c74a9d0d38d342cd93818df45a7f58f60;p=thirdparty%2Fvalgrind.git

Give the ppc64 guest state a 16-entry pseudo-register array,
guest_REDIR_STACK.  This is used (along with a stack pointer,
guest_REDIR_SP) by Valgrind to support function replacement and
wrapping on ppc64-linux.  Due to the strange ppc64-linux ABI, both
replacement and wrapping require saving (%R2,%LR) pairs on a stack,
and this provides the stack.



git-svn-id: svn://svn.valgrind.org/vex/trunk@1539
---

diff --git a/VEX/priv/guest-ppc/ghelpers.c b/VEX/priv/guest-ppc/ghelpers.c
index 54d1767020..a070c91d36 100644
--- a/VEX/priv/guest-ppc/ghelpers.c
+++ b/VEX/priv/guest-ppc/ghelpers.c
@@ -470,6 +470,7 @@ void LibVEX_GuestPPC32_initialise ( /*OUT*/VexGuestPPC32State* vex_state )
 /* VISIBLE TO LIBVEX CLIENT */
 void LibVEX_GuestPPC64_initialise ( /*OUT*/VexGuestPPC64State* vex_state )
 {
+   Int i;
    vex_state->guest_GPR0  = 0;
    vex_state->guest_GPR1  = 0;
    vex_state->guest_GPR2  = 0;
@@ -614,6 +615,10 @@ void LibVEX_GuestPPC64_initialise ( /*OUT*/VexGuestPPC64State* vex_state )
    vex_state->guest_TILEN   = 0;
 
    vex_state->guest_NRADDR = 0;
+
+   vex_state->guest_REDIR_SP = -1;
+   for (i = 0; i < VEX_GUEST_PPC64_REDIR_STACK_SIZE; i++)
+      vex_state->guest_REDIR_STACK[i] = 0;
 }
 
 
@@ -715,7 +720,7 @@ VexGuestLayout
 
           /* Describe any sections to be regarded by Memcheck as
              'always-defined'. */
-          .n_alwaysDefd = 7,
+          .n_alwaysDefd = 8,
 
           .alwaysDefd 
 	  = { /*  0 */ ALWAYSDEFD32(guest_CIA),
@@ -724,7 +729,8 @@ VexGuestLayout
 	      /*  3 */ ALWAYSDEFD32(guest_TILEN),
 	      /*  4 */ ALWAYSDEFD32(guest_VSCR),
 	      /*  5 */ ALWAYSDEFD32(guest_FPROUND),
-	      /*  6 */ ALWAYSDEFD32(guest_RESVN)
+	      /*  6 */ ALWAYSDEFD32(guest_RESVN),
+	      /*  7 */ ALWAYSDEFD32(guest_NRADDR)
             }
         };
 
@@ -748,7 +754,7 @@ VexGuestLayout
 
           /* Describe any sections to be regarded by Memcheck as
              'always-defined'. */
-          .n_alwaysDefd = 7,
+          .n_alwaysDefd = 10,
 
           .alwaysDefd 
 	  = { /*  0 */ ALWAYSDEFD64(guest_CIA),
@@ -757,7 +763,10 @@ VexGuestLayout
 	      /*  3 */ ALWAYSDEFD64(guest_TILEN),
 	      /*  4 */ ALWAYSDEFD64(guest_VSCR),
 	      /*  5 */ ALWAYSDEFD64(guest_FPROUND),
-	      /*  6 */ ALWAYSDEFD64(guest_RESVN)
+	      /*  6 */ ALWAYSDEFD64(guest_RESVN),
+	      /*  7 */ ALWAYSDEFD64(guest_NRADDR),
+	      /*  8 */ ALWAYSDEFD64(guest_REDIR_SP),
+	      /*  9 */ ALWAYSDEFD64(guest_REDIR_STACK)
             }
         };
 
diff --git a/VEX/pub/libvex_guest_ppc64.h b/VEX/pub/libvex_guest_ppc64.h
index eee7094e2a..b03db616d3 100644
--- a/VEX/pub/libvex_guest_ppc64.h
+++ b/VEX/pub/libvex_guest_ppc64.h
@@ -93,6 +93,8 @@ vrsave    Non-volatile 32-bit register
 /*--- Vex's representation of the PPC64 CPU state             ---*/
 /*---------------------------------------------------------------*/
 
+#define VEX_GUEST_PPC64_REDIR_STACK_SIZE 16
+
 typedef
    struct {
       /* General Purpose Registers */
@@ -256,6 +258,13 @@ typedef
          replace-style ones. */
       /* 1112 */ ULong guest_NRADDR;
 
+     /* A grows-upwards stack for hidden saves/restores of LR and R2
+        needed for function interception and wrapping on ppc64-linux.
+        A horrible hack.  REDIR_SP points to the highest live entry,
+        and so starts at -1. */
+      /* 1120 */ ULong guest_REDIR_SP;
+      /* 1128 */ ULong guest_REDIR_STACK[VEX_GUEST_PPC64_REDIR_STACK_SIZE];
+
       /* Padding to make it have an 8-aligned size */
       /* UInt  padding; */
    }