+2009-04-01 Nathan Sidwell <nathan@codesourcery.com>
+
+ * config/tc-arm.c (do_nop): Generate v6k nops whenever possible.
+ (arm_handle_align): Generate v6k ARM, thumb2 wide & narrow nops
+ whenever possible.
+
2009-03-31 Peter Bergner <bergner@vnet.ibm.com>
* config/tc-ppc.c (ppc_handle_align): Handle power7's group ending nop.
static void
do_nop (void)
{
- if (inst.operands[0].present)
+ if (inst.operands[0].present
+ || ARM_CPU_HAS_FEATURE (selected_cpu, arm_ext_v6k))
{
/* Architectural NOP hints are CPSR sets with no bits selected. */
inst.instruction &= 0xf0000000;
- inst.instruction |= 0x0320f000 + inst.operands[0].imm;
+ inst.instruction |= 0x0320f000;
+ if (inst.operands[0].present)
+ inst.instruction |= inst.operands[0].imm;
}
}
void
arm_handle_align (fragS * fragP)
{
- static char const arm_noop[4] = { 0x00, 0x00, 0xa0, 0xe1 };
- static char const thumb_noop[2] = { 0xc0, 0x46 };
- static char const arm_bigend_noop[4] = { 0xe1, 0xa0, 0x00, 0x00 };
- static char const thumb_bigend_noop[2] = { 0x46, 0xc0 };
-
- int bytes, fix, noop_size;
+ static char const arm_noop[2][2][4] =
+ {
+ { /* ARMv1 */
+ {0x00, 0x00, 0xa0, 0xe1}, /* LE */
+ {0xe1, 0xa0, 0x00, 0x00}, /* BE */
+ },
+ { /* ARMv6k */
+ {0x00, 0xf0, 0x20, 0xe3}, /* LE */
+ {0xe3, 0x20, 0xf0, 0x00}, /* BE */
+ },
+ };
+ static char const thumb_noop[2][2][2] =
+ {
+ { /* Thumb-1 */
+ {0xc0, 0x46}, /* LE */
+ {0x46, 0xc0}, /* BE */
+ },
+ { /* Thumb-2 */
+ {0x00, 0xbf}, /* LE */
+ {0xbf, 0x00} /* BE */
+ }
+ };
+ static char const wide_thumb_noop[2][4] =
+ { /* Wide Thumb-2 */
+ {0xaf, 0xf3, 0x00, 0x80}, /* LE */
+ {0xf3, 0xaf, 0x80, 0x00}, /* BE */
+ };
+
+ unsigned bytes, fix, noop_size;
char * p;
const char * noop;
+ const char *narrow_noop = NULL;
if (fragP->fr_type != rs_align_code)
return;
if (fragP->tc_frag_data & (~ MODE_RECORDED))
{
- if (target_big_endian)
- noop = thumb_bigend_noop;
+ if (ARM_CPU_HAS_FEATURE (selected_cpu, arm_ext_v6t2))
+ {
+ narrow_noop = thumb_noop[1][target_big_endian];
+ noop = wide_thumb_noop[target_big_endian];
+ }
else
- noop = thumb_noop;
- noop_size = sizeof (thumb_noop);
+ noop = thumb_noop[0][target_big_endian];
+ noop_size = 2;
}
else
{
- if (target_big_endian)
- noop = arm_bigend_noop;
- else
- noop = arm_noop;
- noop_size = sizeof (arm_noop);
+ noop = arm_noop[ARM_CPU_HAS_FEATURE (selected_cpu, arm_ext_v6k) != 0]
+ [target_big_endian];
+ noop_size = 4;
}
-
+
+ fragP->fr_var = noop_size;
+
if (bytes & (noop_size - 1))
{
fix = bytes & (noop_size - 1);
bytes -= fix;
}
+ if (narrow_noop)
+ {
+ if (bytes & noop_size)
+ {
+ /* Insert a narrow noop. */
+ memcpy (p, narrow_noop, noop_size);
+ p += noop_size;
+ bytes -= noop_size;
+ fix += noop_size;
+ }
+
+ /* Use wide noops for the remainder */
+ noop_size = 4;
+ }
+
while (bytes >= noop_size)
{
memcpy (p, noop, noop_size);
}
fragP->fr_fix += fix;
- fragP->fr_var = noop_size;
}
/* Called from md_do_align. Used to create an alignment
+2009-04-01 Nathan Sidwell <nathan@codesourcery.com>
+
+ * gas/arm/align.s, gas/arm/align.d: New.
+ * gas/arm/thumb32.d, gas/arm/arch6zk.d, gas/arm/arch6zk.s,
+ arm/thumb2_relax.d: Adjust for align changes.
+
2009-03-31 Peter Bergner <bergner@vnet.ibm.com>
* gas/ppc/power7.d ("ori", ".p2align"): Add tests for group ending nop.
--- /dev/null
+# name: ARM V6t2 Alignment
+# as: -march=armv6kt2
+# objdump: -dr --prefix-addresses --show-raw-insn
+
+.*: +file format .*arm.*
+
+Disassembly of section .text:
+0+000 <[^>]*> bf00 nop
+0+002 <[^>]*> 4611 mov r1, r2
+0+004 <[^>]*> f3af 8000 nop.w
+0+008 <[^>]*> f3af 8000 nop.w
+0+00c <[^>]*> f3af 8000 nop.w
+0+010 <[^>]*> 4611 mov r1, r2
+0+012 <[^>]*> bf00 nop
+0+014 <[^>]*> f3af 8000 nop.w
+0+018 <[^>]*> e320f000 nop \{0\}
+0+01c <[^>]*> e1a01002 mov r1, r2
+0+020 <[^>]*> e1a01002 mov r1, r2
+0+024 <[^>]*> e320f000 nop \{0\}
+0+028 <[^>]*> e320f000 nop \{0\}
+0+02c <[^>]*> e320f000 nop \{0\}
+0+030 <[^>]*> e320f000 nop \{0\}
+0+034 <[^>]*> e320f000 nop \{0\}
+0+038 <[^>]*> e320f000 nop \{0\}
+0+03c <[^>]*> e320f000 nop \{0\}
--- /dev/null
+ .syntax unified
+ .thumb
+ nop
+ mov r1,r2
+ .p2align 4
+ mov r1,r2
+ .p2align 3
+
+ .arm
+ nop
+ mov r1,r2
+ .p2align 4
+ mov r1,r2
+ .p2align 5
0+048 <[^>]*> e320f001 ? yield
0+04c <[^>]*> e16ec371 ? smc 60465
0+050 <[^>]*> 11613c7e ? smcne 5070
-0+054 <[^>]*> e1a00000 ? nop[ ]+\(mov r0,r0\)
-0+058 <[^>]*> e1a00000 ? nop[ ]+\(mov r0,r0\)
-0+05c <[^>]*> e1a00000 ? nop[ ]+\(mov r0,r0\)
-
+#...
smc 0xec31
smcne 0x13ce
- # Add three nop instructions to ensure that the
- # output is 32-byte aligned as required for arm-aout.
- nop
- nop
- nop
+ # Ensure output is 32-byte aligned as required for arm-aout.
+ .p2align 5
0+02e <[^>]+> f89f 800c ldrb.w r8, \[pc, #12\] ; 0+03c <[^>]+>
0+032 <[^>]+> f89f 100a ldrb.w r1, \[pc, #10\] ; 0+03e <[^>]+>
0+036 <[^>]+> f81f 1038 ldrb.w r1, \[pc, #-56\] ; 0+000 <[^>]+>
-0+03a <[^>]+> 46c0 nop \(mov r8, r8\)
+0+03a <[^>]+> bf00 nop
0+03c <[^>]+> bf00 nop
0+03e <[^>]+> f995 1000 ldrsb.w r1, \[r5\]
0+042 <[^>]+> f995 1023 ldrsb.w r1, \[r5, #35\]
0+126 <[^>]+> f8df 800c ldr.w r8, \[pc, #12\] ; 0+134 <[^>]+>
0+12a <[^>]+> f8df 100a ldr.w r1, \[pc, #10\] ; 0+136 <[^>]+>
0+12e <[^>]+> f85f 1036 ldr.w r1, \[pc, #-54\] ; 0+0fa <[^>]+>
-0+132 <[^>]+> 46c0 nop \(mov r8, r8\)
+0+132 <[^>]+> bf00 nop
0+134 <[^>]+> bf00 nop
0+136 <[^>]+> 7029 strb r1, \[r5, #0\]
0+138 <[^>]+> f885 1023 strb.w r1, \[r5, #35\]
0[0-9a-f]+ <[^>]+> e002 b\.n 0+358 <[^>]+>
0[0-9a-f]+ <[^>]+> e7d4 b\.n 0+2fe <[^>]+>
0[0-9a-f]+ <[^>]+> e000 b\.n 0+358 <[^>]+>
-0[0-9a-f]+ <[^>]+> 46c0 nop \(mov r8, r8\)
+0[0-9a-f]+ <[^>]+> bf00 nop
0[0-9a-f]+ <[^>]+> f43f affe beq\.w 0+358 <[^>]+>
0[0-9a-f]+ <[^>]+> f000 8058 beq\.w 0+410 <[^>]+>
0[0-9a-f]+ <[^>]+> f47f affa bne\.w 0+358 <[^>]+>
projects / deliverable / binutils-gdb.git / commitdiff
