From f968d35dc0302f3fb7fba5a1bafb5feed1f758f6 Mon Sep 17 00:00:00 2001
From: notaz
Date: Sun, 31 Jul 2011 23:50:19 +0300
Subject: drc: fix page get code in linkage_arm.s

it did not match what was used elsewhere for PCSX,
causing rare crashes due to making bad links..

Also comment get_pointer, it's not obvious what it does.
---
 libpcsxcore/new_dynarec/assem_arm.c   |  6 +++++-
 libpcsxcore/new_dynarec/linkage_arm.s | 24 ++++++++++++++----------
 2 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/libpcsxcore/new_dynarec/assem_arm.c b/libpcsxcore/new_dynarec/assem_arm.c
index 0c668d3..33ecf8e 100644
--- a/libpcsxcore/new_dynarec/assem_arm.c
+++ b/libpcsxcore/new_dynarec/assem_arm.c
@@ -186,11 +186,15 @@ void *kill_pointer(void *stub)
   return i_ptr;
 }
 
+// find where external branch is liked to using addr of it's stub:
+// get address that insn one after stub loads (dyna_linker arg1),
+// treat it as a pointer to branch insn,
+// return addr where that branch jumps to
 int get_pointer(void *stub)
 {
   //printf("get_pointer(%x)\n",(int)stub);
   int *ptr=(int *)(stub+4);
-  assert((*ptr&0x0ff00000)==0x05900000);
+  assert((*ptr&0x0fff0000)==0x059f0000);
   u_int offset=*ptr&0xfff;
   int **l_ptr=(void *)ptr+offset+8;
   int *i_ptr=*l_ptr;
diff --git a/libpcsxcore/new_dynarec/linkage_arm.s b/libpcsxcore/new_dynarec/linkage_arm.s
index 6107e27..b22d491 100644
--- a/libpcsxcore/new_dynarec/linkage_arm.s
+++ b/libpcsxcore/new_dynarec/linkage_arm.s
@@ -219,14 +219,16 @@ dynarec_local_end = memory_map + 4194304
 dyna_linker:
 	/* r0 = virtual target address */
 	/* r1 = instruction to patch */
-	mov	r12, r0
-	mov	r6, #4096
-	mov	r2, #0x80000
 	ldr	r3, .jiptr
+	/* get_page */
+	lsr     r2, r0, #12
+	mov	r6, #4096
+	bic	r2, r2, #0xe0000
 	sub	r6, r6, #1
+	cmp     r2, #0x1000
 	ldr	r7, [r1]
-	eor	r2, r2, r12, lsr #12
-	and	r6, r6, r12, lsr #12
+	biclt   r2, #0x0e00
+	and	r6, r6, r2
 	cmp	r2, #2048
 	add	r12, r7, #2
 	orrcs	r2, r6, #2048
@@ -337,14 +339,16 @@ exec_pagefault:
 dyna_linker_ds:
 	/* r0 = virtual target address */
 	/* r1 = instruction to patch */
-	mov	r12, r0
-	mov	r6, #4096
-	mov	r2, #0x80000
 	ldr	r3, .jiptr
+	/* get_page */
+	lsr     r2, r0, #12
+	mov	r6, #4096
+	bic	r2, r2, #0xe0000
 	sub	r6, r6, #1
+	cmp     r2, #0x1000
 	ldr	r7, [r1]
-	eor	r2, r2, r12, lsr #12
-	and	r6, r6, r12, lsr #12
+	biclt   r2, #0x0e00
+	and	r6, r6, r2
 	cmp	r2, #2048
 	add	r12, r7, #2
 	orrcs	r2, r6, #2048
-- 
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