openadk/toolchain/binutils/patches/lemote-fix.patch

diff -Nur binutils-2.20.orig/gas/config/tc-mips.c binutils-2.20/gas/config/tc-mips.c
--- binutils-2.20.orig/gas/config/tc-mips.c	2009-09-22 17:41:00.000000000 +0200
+++ binutils-2.20/gas/config/tc-mips.c	2010-03-06 18:44:16.000000000 +0100
@@ -761,6 +761,15 @@
   NUM_FIX_VR4120_CLASSES
 };
 
+/* ...likewise -mfix-loongson2f-jump.  */
+static int mips_fix_loongson2f_jump;
+
+/* ...likewise -mfix-loongson2f-nop.  */
+static int mips_fix_loongson2f_nop;
+
+/* True if -mfix-loongson2f-nop or -mfix-loongson2f-jump passed */
+static int mips_fix_loongson2f;
+
 /* Given two FIX_VR4120_* values X and Y, bit Y of element X is set if
    there must be at least one other instruction between an instruction
    of type X and an instruction of type Y.  */
@@ -1918,6 +1927,8 @@
 	      if (nop_insn.insn_mo == NULL && strcmp (name, "nop") == 0)
 		{
 		  create_insn (&nop_insn, mips_opcodes + i);
+		  if (mips_fix_loongson2f_nop)
+		    nop_insn.insn_opcode = LOONGSON2F_NOP_INSN;
 		  nop_insn.fixed_p = 1;
 		}
 	    }
@@ -2731,6 +2742,53 @@
   return nops;
 }
 
+static void
+macro_build (expressionS *ep, const char *name, const char *fmt, ...);
+
+static void fix_loongson2f_nop(struct mips_cl_insn *ip)
+{
+  /* Fix NOP issue: Replace nops by "or at,at,zero" */
+  if (strcmp(ip->insn_mo->name, "nop") == 0)
+    ip->insn_opcode = LOONGSON2F_NOP_INSN;
+}
+
+static void fix_loongson2f_jump(struct mips_cl_insn *ip)
+{
+
+  /* Fix Jump Issue: Eliminate instruction fetch from outside 256M region
+   *                 jr target pc &= 'hffff_ffff_cfff_ffff
+   */
+  if (strcmp(ip->insn_mo->name, "j") == 0
+      || strcmp(ip->insn_mo->name, "jr") == 0
+      || strcmp(ip->insn_mo->name, "jalr") == 0)
+    {
+      int sreg;
+      expressionS ep;
+
+      if (! mips_opts.at)
+        return;
+
+      sreg = EXTRACT_OPERAND (RS, *ip);
+      if (sreg == ZERO || sreg == KT0 || sreg == KT1 || sreg == ATREG)
+        return;
+
+      ep.X_op = O_constant;
+      ep.X_add_number = 0xcfff0000;
+      macro_build (&ep, "lui", "t,u", ATREG, BFD_RELOC_HI16);
+      ep.X_add_number = 0xffff;
+      macro_build (&ep, "ori", "t,r,i", ATREG, ATREG, BFD_RELOC_LO16);
+      macro_build (NULL, "and", "d,v,t", sreg, sreg, ATREG);
+    }
+}
+
+static void fix_loongson2f(struct mips_cl_insn *ip)
+{
+  if (mips_fix_loongson2f_nop)
+    fix_loongson2f_nop(ip);
+  if (mips_fix_loongson2f_jump)
+    fix_loongson2f_jump(ip);
+}
+
 /* Output an instruction.  IP is the instruction information.
    ADDRESS_EXPR is an operand of the instruction to be used with
    RELOC_TYPE.  */
@@ -2744,6 +2802,9 @@
   bfd_boolean relaxed_branch = FALSE;
   segment_info_type *si = seg_info (now_seg);
 
+  if (mips_fix_loongson2f)
+    fix_loongson2f(ip);
+
   /* Mark instruction labels in mips16 mode.  */
   mips16_mark_labels ();
 
@@ -11220,6 +11281,10 @@
     OPTION_MNO_7000_HILO_FIX, 
     OPTION_FIX_24K,
     OPTION_NO_FIX_24K,
+    OPTION_FIX_LOONGSON2F_JUMP,
+    OPTION_NO_FIX_LOONGSON2F_JUMP,
+    OPTION_FIX_LOONGSON2F_NOP,
+    OPTION_NO_FIX_LOONGSON2F_NOP,
     OPTION_FIX_VR4120,
     OPTION_NO_FIX_VR4120,
     OPTION_FIX_VR4130,
@@ -11308,6 +11373,10 @@
   {"mfix7000", no_argument, NULL, OPTION_M7000_HILO_FIX},
   {"no-fix-7000", no_argument, NULL, OPTION_MNO_7000_HILO_FIX},
   {"mno-fix7000", no_argument, NULL, OPTION_MNO_7000_HILO_FIX},
+  {"mfix-loongson2f-jump", no_argument, NULL, OPTION_FIX_LOONGSON2F_JUMP},
+  {"mno-fix-loongson2f-jump", no_argument, NULL, OPTION_NO_FIX_LOONGSON2F_JUMP},
+  {"mfix-loongson2f-nop", no_argument, NULL, OPTION_FIX_LOONGSON2F_NOP},
+  {"mno-fix-loongson2f-nop", no_argument, NULL, OPTION_NO_FIX_LOONGSON2F_NOP},
   {"mfix-vr4120",    no_argument, NULL, OPTION_FIX_VR4120},
   {"mno-fix-vr4120", no_argument, NULL, OPTION_NO_FIX_VR4120},
   {"mfix-vr4130",    no_argument, NULL, OPTION_FIX_VR4130},
@@ -11575,6 +11644,22 @@
       mips_fix_24k = 0;
       break;
 
+    case OPTION_FIX_LOONGSON2F_JUMP:
+      mips_fix_loongson2f_jump = 1;
+      break;
+
+    case OPTION_NO_FIX_LOONGSON2F_JUMP:
+      mips_fix_loongson2f_jump = 0;
+      break;
+
+    case OPTION_FIX_LOONGSON2F_NOP:
+      mips_fix_loongson2f_nop = 1;
+      break;
+
+    case OPTION_NO_FIX_LOONGSON2F_NOP:
+      mips_fix_loongson2f_nop = 0;
+      break;
+
     case OPTION_FIX_VR4120:
       mips_fix_vr4120 = 1;
       break;
@@ -11789,6 +11874,8 @@
       return 0;
     }
 
+    mips_fix_loongson2f = mips_fix_loongson2f_nop || mips_fix_loongson2f_jump;
+
   return 1;
 }
 
@@ -14794,6 +14881,8 @@
 mips_handle_align (fragS *fragp)
 {
   char *p;
+  int bytes, size, excess;
+  valueT opcode;
 
   if (fragp->fr_type != rs_align_code)
     return;
@@ -14801,17 +14890,27 @@
   p = fragp->fr_literal + fragp->fr_fix;
   if (*p)
     {
-      int bytes;
+      opcode = mips16_nop_insn.insn_opcode;
+      size = 2;
+    }
+  else
+    {
+      opcode = nop_insn.insn_opcode;
+      size = 4;
+    }
 
-      bytes = fragp->fr_next->fr_address - fragp->fr_address - fragp->fr_fix;
-      if (bytes & 1)
-	{
-	  *p++ = 0;
-	  fragp->fr_fix++;
-	}
-      md_number_to_chars (p, mips16_nop_insn.insn_opcode, 2);
-      fragp->fr_var = 2;
+  bytes = fragp->fr_next->fr_address - fragp->fr_address - fragp->fr_fix;
+  excess = bytes % size;
+  if (excess != 0)
+    {
+      /* If we're not inserting a whole number of instructions, pad the
+         end of the fixed part of the frag with zeros */
+      memset (p, 0, excess);
+      p += excess;
+      fragp->fr_fix += excess;
     }
+  md_number_to_chars (p, opcode, size);
+  fragp->fr_var = size;
 }
 
 static void
@@ -15523,6 +15622,8 @@
 -mmt			generate MT instructions\n\
 -mno-mt			do not generate MT instructions\n"));
   fprintf (stream, _("\
+-mfix-loongson2f-jump	work around Loongson2F JUMP instructions\
+-mfix-loongson2f-nop	work around Loongson2F NOP errata\n\
 -mfix-vr4120		work around certain VR4120 errata\n\
 -mfix-vr4130		work around VR4130 mflo/mfhi errata\n\
 -mfix-24k		insert a nop after ERET and DERET instructions\n\
diff -Nur binutils-2.20.orig/gas/config/tc-mips.h binutils-2.20/gas/config/tc-mips.h
--- binutils-2.20.orig/gas/config/tc-mips.h	2009-09-02 09:24:20.000000000 +0200
+++ binutils-2.20/gas/config/tc-mips.h	2010-03-06 18:44:16.000000000 +0100
@@ -59,7 +59,7 @@
 extern void mips_handle_align (struct frag *);
 #define HANDLE_ALIGN(fragp)  mips_handle_align (fragp)
 
-#define MAX_MEM_FOR_RS_ALIGN_CODE  (1 + 2)
+#define MAX_MEM_FOR_RS_ALIGN_CODE  (3 + 4)
 
 struct insn_label_list;
 struct mips_segment_info {
diff -Nur binutils-2.20.orig/gas/doc/c-mips.texi binutils-2.20/gas/doc/c-mips.texi
--- binutils-2.20.orig/gas/doc/c-mips.texi	2009-09-28 12:23:57.000000000 +0200
+++ binutils-2.20/gas/doc/c-mips.texi	2010-03-06 18:44:16.000000000 +0100
@@ -172,6 +172,19 @@
 Cause nops to be inserted if the read of the destination register
 of an mfhi or mflo instruction occurs in the following two instructions.
 
+@item -mfix-loongson2f-jump
+@itemx -mno-fix-loongson2f-jump
+Eliminate instruction fetch from outside 256M region to work around the
+Loongson2F @samp{jump} instructions. Without it, under extreme cases, kernel
+may crash. The issue has been solved in latest processor batches, but this fix
+has no side effect to them.
+
+@item -mfix-loongson2f-nop
+@itemx -mno-fix-loongson2f-nop
+Replace nops by @code{or at,at,zero} to work around the Loongson2F @samp{nop}
+errata. Without it, under extreme cases, cpu might deadlock. The issue has been
+solved in latest loongson2f batches, but this fix has no side effect to them.
+
 @item -mfix-vr4120
 @itemx -no-mfix-vr4120
 Insert nops to work around certain VR4120 errata.  This option is
diff -Nur binutils-2.20.orig/gas/testsuite/gas/mips/loongson-2f-2.d binutils-2.20/gas/testsuite/gas/mips/loongson-2f-2.d
--- binutils-2.20.orig/gas/testsuite/gas/mips/loongson-2f-2.d	1970-01-01 01:00:00.000000000 +0100
+++ binutils-2.20/gas/testsuite/gas/mips/loongson-2f-2.d	2010-03-06 18:44:16.000000000 +0100
@@ -0,0 +1,18 @@
+#as: -mfix-loongson2f-nop
+#objdump: -M reg-names=numeric -dr
+#name: ST Microelectronics Loongson-2F workarounds of nop issue 
+
+.*:     file format .*
+
+
+Disassembly of section .text:
+
+00000000 <loongson2f_nop_insn>:
+   0:	00200825 	move	\$1,\$1
+   4:	00200825 	move	\$1,\$1
+   8:	00200825 	move	\$1,\$1
+   c:	00200825 	move	\$1,\$1
+  10:	00200825 	move	\$1,\$1
+  14:	00200825 	move	\$1,\$1
+  18:	00200825 	move	\$1,\$1
+  1c:	00200825 	move	\$1,\$1
diff -Nur binutils-2.20.orig/gas/testsuite/gas/mips/loongson-2f-2.s binutils-2.20/gas/testsuite/gas/mips/loongson-2f-2.s
--- binutils-2.20.orig/gas/testsuite/gas/mips/loongson-2f-2.s	1970-01-01 01:00:00.000000000 +0100
+++ binutils-2.20/gas/testsuite/gas/mips/loongson-2f-2.s	2010-03-06 18:44:16.000000000 +0100
@@ -0,0 +1,10 @@
+# Test the work around of the NOP issue of loongson2F
+	.text
+	.set noreorder
+
+	.align 5	# Test _implicit_ nops
+loongson2f_nop_insn:
+	nop		# Test _explicit_ nops
+
+# align section end to 16-byte boundary for easier testing on multiple targets
+	.p2align 4
diff -Nur binutils-2.20.orig/gas/testsuite/gas/mips/loongson-2f-3.d binutils-2.20/gas/testsuite/gas/mips/loongson-2f-3.d
--- binutils-2.20.orig/gas/testsuite/gas/mips/loongson-2f-3.d	1970-01-01 01:00:00.000000000 +0100
+++ binutils-2.20/gas/testsuite/gas/mips/loongson-2f-3.d	2010-03-06 18:44:16.000000000 +0100
@@ -0,0 +1,35 @@
+#as: -mfix-loongson2f-jump
+#objdump: -M reg-names=numeric -dr
+#name: ST Microelectronics Loongson-2F workarounds of Jump Instruction issue 
+
+.*:     file format .*
+
+
+Disassembly of section .text:
+
+00000000 <.text>:
+   0:	3c01cfff 	lui	\$1,0xcfff
+   4:	3421ffff 	ori	\$1,\$1,0xffff
+   8:	03c1f024 	and	\$30,\$30,\$1
+   c:	03c00008 	jr	\$30
+  10:	00000000 	nop
+
+  14:	3c01cfff 	lui	\$1,0xcfff
+  18:	3421ffff 	ori	\$1,\$1,0xffff
+  1c:	03e1f824 	and	\$31,\$31,\$1
+  20:	03e00008 	jr	\$31
+  24:	00000000 	nop
+
+  28:	3c01cfff 	lui	\$1,0xcfff
+  2c:	3421ffff 	ori	\$1,\$1,0xffff
+  30:	03c1f024 	and	\$30,\$30,\$1
+  34:	03c0f809 	jalr	\$30
+  38:	00000000 	nop
+
+  3c:	00200008 	jr	\$1
+  40:	00000000 	nop
+
+  44:	08000000 	j	0x0
+			44: R_MIPS_26	external_label
+  48:	00000000 	nop
+  4c:	00000000 	nop
diff -Nur binutils-2.20.orig/gas/testsuite/gas/mips/loongson-2f-3.s binutils-2.20/gas/testsuite/gas/mips/loongson-2f-3.s
--- binutils-2.20.orig/gas/testsuite/gas/mips/loongson-2f-3.s	1970-01-01 01:00:00.000000000 +0100
+++ binutils-2.20/gas/testsuite/gas/mips/loongson-2f-3.s	2010-03-06 18:44:16.000000000 +0100
@@ -0,0 +1,23 @@
+# Test the work around of the Jump instruction Issue of Loongson2F
+	.text
+	.set noreorder
+
+	j	$30	# j with register
+	 nop
+
+	jr	$31	# jr
+	 nop
+
+	jalr	$30	# jalr
+	 nop
+
+	.set	noat
+	jr	$1	# jr with at register and .set annotation
+ 	 nop
+	.set	at
+
+	j	external_label	# j with label
+	 nop
+
+# align section end to 16-byte boundary for easier testing on multiple targets
+	.p2align 4
diff -Nur binutils-2.20.orig/gas/testsuite/gas/mips/mips.exp binutils-2.20/gas/testsuite/gas/mips/mips.exp
--- binutils-2.20.orig/gas/testsuite/gas/mips/mips.exp	2009-09-22 17:41:03.000000000 +0200
+++ binutils-2.20/gas/testsuite/gas/mips/mips.exp	2010-03-06 18:44:16.000000000 +0100
@@ -789,6 +789,8 @@
 
     run_dump_test "loongson-2e"
     run_dump_test "loongson-2f"
+    run_dump_test "loongson-2f-2"
+    run_dump_test "loongson-2f-3"
 
     run_dump_test_arches "octeon"	[mips_arch_list_matching octeon]
     run_list_test_arches "octeon-ill" "" \
diff -Nur binutils-2.20.orig/include/opcode/mips.h binutils-2.20/include/opcode/mips.h
--- binutils-2.20.orig/include/opcode/mips.h	2009-09-02 09:21:40.000000000 +0200
+++ binutils-2.20/include/opcode/mips.h	2010-03-06 18:44:16.000000000 +0100
@@ -1106,4 +1106,8 @@
 extern const struct mips_opcode mips16_opcodes[];
 extern const int bfd_mips16_num_opcodes;
 
+/* Replace the original nops by "or at,at,zero",
+   Used to implement -mfix-loongson2f */
+#define LOONGSON2F_NOP_INSN	0x00200825
+
 #endif /* _MIPS_H_ */