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2006-03-20 Paul Brook <paul@codesourcery.com> 

gas/
	* config/tc-arm.c (BAD_BRANCH, BAD_NOT_IT): Define.
	(do_t_branch): Encode branches inside IT blocks as unconditional.
	(do_t_cps): New function.
	(do_t_blx, do_t_bkpt, do_t_branch23, do_t_bx, do_t_bxj, do_t_cpsi,
	do_t_czb, do_t_it, do_t_setend, do_t_tb): Add IT constaints.
	(opcode_lookup): Allow conditional suffixes on all instructions in
	Thumb mode.
	(md_assemble): Advance condexec state before checking for errors.
	(insns): Use do_t_cps.
gas/testsuite/
	* gas/arm/thumb2_bcond.d: New test.
	* gas/arm/thumb2_bcond.s: New test.
	* gas/arm/thumb2_it_bad.d: New test.
	* gas/arm/thumb2_it_bad.l: New test.
	* gas/arm/thumb2_it_bad.s: New test.
This commit is contained in:
Paul Brook 2006-03-20 15:38:02 +00:00
parent 6e1cb1a6e6
commit dfa9f0d57b
8 changed files with 168 additions and 16 deletions
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12
gas/ChangeLog
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@ -1,3 +1,15 @@
2006-03-20 Paul Brook <paul@codesourcery.com>
* config/tc-arm.c (BAD_BRANCH, BAD_NOT_IT): Define.
(do_t_branch): Encode branches inside IT blocks as unconditional.
(do_t_cps): New function.
(do_t_blx, do_t_bkpt, do_t_branch23, do_t_bx, do_t_bxj, do_t_cpsi,
do_t_czb, do_t_it, do_t_setend, do_t_tb): Add IT constaints.
(opcode_lookup): Allow conditional suffixes on all instructions in
Thumb mode.
(md_assemble): Advance condexec state before checking for errors.
(insns): Use do_t_cps.
2006-03-20 Paul Brook <paul@codesourcery.com>
* config/tc-arm.c (output_relax_insn): Call dwarf2_emit_insn before

75
gas/config/tc-arm.c
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@ -568,6 +568,8 @@ struct asm_opcode
#define BAD_HIREG _("lo register required")
#define BAD_THUMB32 _("instruction not supported in Thumb16 mode")
#define BAD_ADDR_MODE _("instruction does not accept this addressing mode");
#define BAD_BRANCH _("branch must be last instruction in IT block")
#define BAD_NOT_IT _("instruction not allowed in IT block")
static struct hash_control *arm_ops_hsh;
static struct hash_control *arm_cond_hsh;
@ -6597,6 +6599,7 @@ do_t_bfx (void)
static void
do_t_blx (void)
{
constraint (current_it_mask && current_it_mask != 0x10, BAD_BRANCH);
if (inst.operands[0].isreg)
/* We have a register, so this is BLX(2). */
inst.instruction |= inst.operands[0].reg << 3;
@ -6618,7 +6621,20 @@ static void
do_t_branch (void)
{
int opcode;
if (inst.cond != COND_ALWAYS)
int cond;
if (current_it_mask)
{
/* Conditional branches inside IT blocks are encoded as unconditional
branches. */
cond = COND_ALWAYS;
/* A branch must be the last instruction in an IT block. */
constraint (current_it_mask != 0x10, BAD_BRANCH);
}
else
cond = inst.cond;
if (cond != COND_ALWAYS)
opcode = T_MNEM_bcond;
else
opcode = inst.instruction;
@ -6626,23 +6642,23 @@ do_t_branch (void)
if (unified_syntax && inst.size_req == 4)
{
inst.instruction = THUMB_OP32(opcode);
if (inst.cond == COND_ALWAYS)
if (cond == COND_ALWAYS)
inst.reloc.type = BFD_RELOC_THUMB_PCREL_BRANCH25;
else
{
assert (inst.cond != 0xF);
inst.instruction |= inst.cond << 22;
assert (cond != 0xF);
inst.instruction |= cond << 22;
inst.reloc.type = BFD_RELOC_THUMB_PCREL_BRANCH20;
}
}
else
{
inst.instruction = THUMB_OP16(opcode);
if (inst.cond == COND_ALWAYS)
if (cond == COND_ALWAYS)
inst.reloc.type = BFD_RELOC_THUMB_PCREL_BRANCH12;
else
{
inst.instruction |= inst.cond << 8;
inst.instruction |= cond << 8;
inst.reloc.type = BFD_RELOC_THUMB_PCREL_BRANCH9;
}
/* Allow section relaxation. */
@ -6656,6 +6672,8 @@ do_t_branch (void)
static void
do_t_bkpt (void)
{
constraint (inst.cond != COND_ALWAYS,
_("instruction is always unconditional"));
if (inst.operands[0].present)
{
constraint (inst.operands[0].imm > 255,
@ -6667,6 +6685,7 @@ do_t_bkpt (void)
static void
do_t_branch23 (void)
{
constraint (current_it_mask && current_it_mask != 0x10, BAD_BRANCH);
inst.reloc.type = BFD_RELOC_THUMB_PCREL_BRANCH23;
inst.reloc.pc_rel = 1;
@ -6685,6 +6704,7 @@ do_t_branch23 (void)
static void
do_t_bx (void)
{
constraint (current_it_mask && current_it_mask != 0x10, BAD_BRANCH);
inst.instruction |= inst.operands[0].reg << 3;
/* ??? FIXME: Should add a hacky reloc here if reg is REG_PC. The reloc
should cause the alignment to be checked once it is known. This is
@ -6694,6 +6714,7 @@ do_t_bx (void)
static void
do_t_bxj (void)
{
constraint (current_it_mask && current_it_mask != 0x10, BAD_BRANCH);
if (inst.operands[0].reg == REG_PC)
as_tsktsk (_("use of r15 in bxj is not really useful"));
@ -6708,9 +6729,17 @@ do_t_clz (void)
inst.instruction |= inst.operands[1].reg;
}
static void
do_t_cps (void)
{
constraint (current_it_mask, BAD_NOT_IT);
inst.instruction |= inst.operands[0].imm;
}
static void
do_t_cpsi (void)
{
constraint (current_it_mask, BAD_NOT_IT);
if (unified_syntax
&& (inst.operands[1].present || inst.size_req == 4)
&& ARM_CPU_HAS_FEATURE (cpu_variant, arm_ext_v6_notm))
@ -6757,6 +6786,7 @@ do_t_cpy (void)
static void
do_t_czb (void)
{
constraint (current_it_mask, BAD_NOT_IT);
constraint (inst.operands[0].reg > 7, BAD_HIREG);
inst.instruction |= inst.operands[0].reg;
inst.reloc.pc_rel = 1;
@ -6793,6 +6823,7 @@ do_t_it (void)
{
unsigned int cond = inst.operands[0].imm;
constraint (current_it_mask, BAD_NOT_IT);
current_it_mask = (inst.instruction & 0xf) | 0x10;
current_cc = cond;
@ -7627,6 +7658,7 @@ do_t_rsb (void)
static void
do_t_setend (void)
{
constraint (current_it_mask, BAD_NOT_IT);
if (inst.operands[0].imm)
inst.instruction |= 0x8;
}
@ -7895,12 +7927,13 @@ do_t_tb (void)
int half;
half = (inst.instruction & 0x10) != 0;
constraint (current_it_mask && current_it_mask != 0x10, BAD_BRANCH);
constraint (inst.operands[0].immisreg,
_("instruction requires register index"));
constraint (inst.operands[0].imm == 15,
_("PC is not a valid index register"));
constraint (!half && inst.operands[0].shifted,
_("instruction does not allow shifted index"));
constraint (half && !inst.operands[0].shifted,
_("instruction requires shifted index"));
inst.instruction |= (inst.operands[0].reg << 16) | inst.operands[0].imm;
}
@ -8225,9 +8258,16 @@ opcode_lookup (char **str)
case OT_unconditional:
case OT_unconditionalF:
/* delayed diagnostic */
inst.error = BAD_COND;
inst.cond = COND_ALWAYS;
if (thumb_mode)
{
inst.cond = cond->value;
}
else
{
/* delayed diagnostic */
inst.error = BAD_COND;
inst.cond = COND_ALWAYS;
}
return opcode;
default:
@ -8322,13 +8362,15 @@ md_assemble (char *str)
{
int cond;
cond = current_cc ^ ((current_it_mask >> 4) & 1) ^ 1;
if (cond != inst.cond)
current_it_mask <<= 1;
current_it_mask &= 0x1f;
/* The BKPT instruction is unconditional even in an IT block. */
if (!inst.error
&& cond != inst.cond && opcode->tencode != do_t_bkpt)
{
as_bad (_("incorrect condition in IT block"));
return;
}
current_it_mask <<= 1;
current_it_mask &= 0x1f;
}
else if (inst.cond != COND_ALWAYS && opcode->tencode != do_t_branch)
{
@ -8824,7 +8866,8 @@ static struct asm_barrier_opt barrier_opt_names[] =
TxCM(m1,m2, aop, T_MNEM_##top, nops, ops, ae, te)
/* Mnemonic that cannot be conditionalized. The ARM condition-code
field is still 0xE. */
field is still 0xE. Many of the Thumb variants can be executed
conditionally, so this is checked separately. */
#define TUE(mnem, op, top, nops, ops, ae, te) \
{ #mnem, OPS##nops ops, OT_unconditional, 0x##op, 0x##top, ARM_VARIANT, \
THUMB_VARIANT, do_##ae, do_##te }
@ -9162,7 +9205,7 @@ static const struct asm_opcode insns[] =
/* ARM V6 not included in V7M (eg. integer SIMD). */
#undef THUMB_VARIANT
#define THUMB_VARIANT &arm_ext_v6_notm
TUF(cps, 1020000, f3af8100, 1, (I31b), imm0, imm0),
TUF(cps, 1020000, f3af8100, 1, (I31b), imm0, t_cps),
TCE(pkhbt, 6800010, eac00000, 4, (RRnpc, RRnpc, RRnpc, oSHll), pkhbt, t_pkhbt),
TCE(pkhtb, 6800050, eac00020, 4, (RRnpc, RRnpc, RRnpc, oSHar), pkhtb, t_pkhtb),
TCE(qadd16, 6200f10, fa90f010, 3, (RRnpc, RRnpc, RRnpc), rd_rn_rm, t_simd),

8
gas/testsuite/ChangeLog
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@ -1,3 +1,11 @@
2006-03-20 Paul Brook <paul@codesourcery.com>
* gas/arm/thumb2_bcond.d: New test.
* gas/arm/thumb2_bcond.s: New test.
* gas/arm/thumb2_it_bad.d: New test.
* gas/arm/thumb2_it_bad.l: New test.
* gas/arm/thumb2_it_bad.s: New test.
2006-03-17 Paul Brook <paul@codesourcery.com>
* gas/arm/thumb32.d: Add ldm and stm tests.

25
gas/testsuite/gas/arm/thumb2_bcond.d Normal file
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@ -0,0 +1,25 @@
# as:
# objdump: -dr --prefix-addresses --show-raw-insn
.*: +file format .*arm.*
Disassembly of section .text:
0+000 <[^>]+> bf18 it ne
0+002 <[^>]+> e7fd b(|ne).n 0+0 <[^>]+>
0+004 <[^>]+> bf38 it cc
0+006 <[^>]+> f7ff bffb b(|cc).w 0+0 <[^>]+>
0+00a <[^>]+> bf28 it cs
0+00c <[^>]+> f7ff fff8 bl(|cs) 0+0 <[^>]+>
0+010 <[^>]+> bfb8 it lt
0+012 <[^>]+> 47a8 blx(|lr) r5
0+014 <[^>]+> bf08 it eq
0+016 <[^>]+> 4740 bx(|eq) r8
0+018 <[^>]+> bfc8 it gt
0+01a <[^>]+> e8d4 f001 tbb(|gt) \[r4, r1\]
0+01e <[^>]+> bfb8 it lt
0+020 <[^>]+> df00 svc(|lt) 0
0+022 <[^>]+> bfdc itt le
0+024 <[^>]+> be00 bkpt 0x0000
0+026 <[^>]+> bf00 nop
0+028 <[^>]+> bf00 nop
0+02a <[^>]+> bf00 nop

25
gas/testsuite/gas/arm/thumb2_bcond.s Normal file
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@ -0,0 +1,25 @@
.text
.arch armv7
.thumb
.syntax unified
.thumb_func
thumb2_bcond:
it ne
bne thumb2_bcond
it cc
bcc.w thumb2_bcond
it cs
blcs thumb2_bcond
it lt
blxlt r5
it eq
bxeq r8
it gt
tbbgt [r4, r1]
it lt
svclt 0
itt le
bkpt #0
nople
nop
nop

3
gas/testsuite/gas/arm/thumb2_it_bad.d Normal file
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@ -0,0 +1,3 @@
#name: Invalid IT instructions
#as:
#error-output: thumb2_it_bad.l

12
gas/testsuite/gas/arm/thumb2_it_bad.l Normal file
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@ -0,0 +1,12 @@
[^:]*: Assembler messages:
[^:]*:8: Error: branch must be last instruction in IT block -- `beq foo'
[^:]*:9: Error: branch must be last instruction in IT block -- `bleq foo'
[^:]*:10: Error: branch must be last instruction in IT block -- `blxeq r0'
[^:]*:11: Error: instruction not allowed in IT block -- `cbzeq r0,foo'
[^:]*:13: Error: branch must be last instruction in IT block -- `bxeq r0'
[^:]*:14: Error: branch must be last instruction in IT block -- `tbbeq \[r0,r1\]'
[^:]*:15: Error: instruction not allowed in IT block -- `cpsieeq f'
[^:]*:17: Error: instruction not allowed in IT block -- `cpseq #0x10'
[^:]*:19: Error: instruction is always unconditional -- `bkpteq 0'
[^:]*:20: Error: instruction not allowed in IT block -- `setendeq le'
[^:]*:22: Error: instruction not allowed in IT block -- `iteq eq'

24
gas/testsuite/gas/arm/thumb2_it_bad.s Normal file
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@ -0,0 +1,24 @@
.text
.syntax unified
.arch armv7a
.thumb
.thumb_func
thumb2_it_bad:
itttt eq
beq foo
bleq foo
blxeq r0
cbzeq r0, foo
ittt eq
bxeq r0
tbbeq [r0, r1]
cpsieeq f
it eq
cpseq #0x10
itt eq
bkpteq 0
setendeq le
it eq
iteq eq
nop
foo: