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ARM: Remove support for ABI prior to EABI

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The support for the old ABI is known to be broken and has been deprecated for some time now. Removed the instructions for loading and storing co-processor registers as they where only used to support the old ABI.

R=karlklose@chromium.org

BUG=v8:1316
TEST=

Review URL: http://codereview.chromium.org//6822025

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7565 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
sgjesse@chromium.org 2011-04-11 09:04:30 +00:00
parent a700211937
commit 75759805a9
11 changed files with 35 additions and 177 deletions
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39
src/arm/assembler-arm.cc
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@ -1824,45 +1824,6 @@ void Assembler::ldc2(Coprocessor coproc,
}
void Assembler::stc(Coprocessor coproc,
CRegister crd,
const MemOperand& dst,
LFlag l,
Condition cond) {
addrmod5(cond | B27 | B26 | l | coproc*B8, crd, dst);
}
void Assembler::stc(Coprocessor coproc,
CRegister crd,
Register rn,
int option,
LFlag l,
Condition cond) {
// Unindexed addressing.
ASSERT(is_uint8(option));
emit(cond | B27 | B26 | U | l | rn.code()*B16 | crd.code()*B12 |
coproc*B8 | (option & 255));
}
void Assembler::stc2(Coprocessor
coproc, CRegister crd,
const MemOperand& dst,
LFlag l) { // v5 and above
stc(coproc, crd, dst, l, kSpecialCondition);
}
void Assembler::stc2(Coprocessor coproc,
CRegister crd,
Register rn,
int option,
LFlag l) { // v5 and above
stc(coproc, crd, rn, option, l, kSpecialCondition);
}
// Support for VFP.
void Assembler::vldr(const DwVfpRegister dst,

10
src/arm/assembler-arm.h
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@ -947,16 +947,6 @@ class Assembler : public AssemblerBase {
void ldc2(Coprocessor coproc, CRegister crd, Register base, int option,
LFlag l = Short); // v5 and above
void stc(Coprocessor coproc, CRegister crd, const MemOperand& dst,
LFlag l = Short, Condition cond = al);
void stc(Coprocessor coproc, CRegister crd, Register base, int option,
LFlag l = Short, Condition cond = al);
void stc2(Coprocessor coproc, CRegister crd, const MemOperand& dst,
LFlag l = Short); // v5 and above
void stc2(Coprocessor coproc, CRegister crd, Register base, int option,
LFlag l = Short); // v5 and above
// Support for VFP.
// All these APIs support S0 to S31 and D0 to D15.
// Currently these APIs do not support extended D registers, i.e, D16 to D31.

30
src/arm/code-stubs-arm.cc
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@ -308,13 +308,9 @@ class ConvertToDoubleStub : public CodeStub {
void ConvertToDoubleStub::Generate(MacroAssembler* masm) {
#ifndef BIG_ENDIAN_FLOATING_POINT
Register exponent = result1_;
Register mantissa = result2_;
#else
Register exponent = result2_;
Register mantissa = result1_;
#endif
Label not_special;
// Convert from Smi to integer.
__ mov(source_, Operand(source_, ASR, kSmiTagSize));
@ -951,18 +947,10 @@ void FloatingPointHelper::CallCCodeForDoubleOperation(
// Call C routine that may not cause GC or other trouble.
__ CallCFunction(ExternalReference::double_fp_operation(op, masm->isolate()),
4);
// Store answer in the overwritable heap number.
#if !defined(USE_ARM_EABI)
// Double returned in fp coprocessor register 0 and 1, encoded as
// register cr8. Offsets must be divisible by 4 for coprocessor so we
// need to substract the tag from heap_number_result.
__ sub(scratch, heap_number_result, Operand(kHeapObjectTag));
__ stc(p1, cr8, MemOperand(scratch, HeapNumber::kValueOffset));
#else
// Double returned in registers 0 and 1.
// Store answer in the overwritable heap number. Double returned in
// registers r0 and r1.
__ Strd(r0, r1, FieldMemOperand(heap_number_result,
HeapNumber::kValueOffset));
#endif
// Place heap_number_result in r0 and return to the pushed return address.
__ mov(r0, Operand(heap_number_result));
__ pop(pc);
@ -2047,17 +2035,9 @@ void GenericBinaryOpStub::HandleBinaryOpSlowCases(
// save.
__ CallCFunction(
ExternalReference::double_fp_operation(op_, masm->isolate()), 4);
// Store answer in the overwritable heap number.
#if !defined(USE_ARM_EABI)
// Double returned in fp coprocessor register 0 and 1, encoded as
// register cr8. Offsets must be divisible by 4 for coprocessor so we
// need to substract the tag from r5.
__ sub(r4, r5, Operand(kHeapObjectTag));
__ stc(p1, cr8, MemOperand(r4, HeapNumber::kValueOffset));
#else
// Double returned in registers 0 and 1.
// Store answer in the overwritable heap number. Double
// returned in registers r0 and r1.
__ Strd(r0, r1, FieldMemOperand(r5, HeapNumber::kValueOffset));
#endif
__ mov(r0, Operand(r5));
// And we are done.
__ pop(pc);

9
src/arm/constants-arm.h
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@ -28,12 +28,9 @@
#ifndef V8_ARM_CONSTANTS_ARM_H_
#define V8_ARM_CONSTANTS_ARM_H_
// The simulator emulates the EABI so we define the USE_ARM_EABI macro if we
// are not running on real ARM hardware. One reason for this is that the
// old ABI uses fp registers in the calling convention and the simulator does
// not simulate fp registers or coroutine instructions.
#if defined(__ARM_EABI__) || !defined(__arm__)
# define USE_ARM_EABI 1
// ARM EABI is required.
#if defined(__arm__) && !defined(__ARM_EABI__)
#error ARM EABI support is required.
#endif
// This means that interwork-compatible jump instructions are generated. We

81
src/arm/cpu-arm.cc
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@ -75,62 +75,33 @@ void CPU::FlushICache(void* start, size_t size) {
register uint32_t end asm("a2") =
reinterpret_cast<uint32_t>(start) + size;
register uint32_t flg asm("a3") = 0;
#ifdef __ARM_EABI__
#if defined (__arm__) && !defined(__thumb__)
// __arm__ may be defined in thumb mode.
register uint32_t scno asm("r7") = __ARM_NR_cacheflush;
asm volatile(
"svc 0x0"
: "=r" (beg)
: "0" (beg), "r" (end), "r" (flg), "r" (scno));
#else
// r7 is reserved by the EABI in thumb mode.
asm volatile(
"@ Enter ARM Mode \n\t"
"adr r3, 1f \n\t"
"bx r3 \n\t"
".ALIGN 4 \n\t"
".ARM \n"
"1: push {r7} \n\t"
"mov r7, %4 \n\t"
"svc 0x0 \n\t"
"pop {r7} \n\t"
"@ Enter THUMB Mode\n\t"
"adr r3, 2f+1 \n\t"
"bx r3 \n\t"
".THUMB \n"
"2: \n\t"
: "=r" (beg)
: "0" (beg), "r" (end), "r" (flg), "r" (__ARM_NR_cacheflush)
: "r3");
#endif
#if defined (__arm__) && !defined(__thumb__)
// __arm__ may be defined in thumb mode.
register uint32_t scno asm("r7") = __ARM_NR_cacheflush;
asm volatile(
"svc 0x0"
: "=r" (beg)
: "0" (beg), "r" (end), "r" (flg), "r" (scno));
#else
#if defined (__arm__) && !defined(__thumb__)
// __arm__ may be defined in thumb mode.
asm volatile(
"svc %1"
: "=r" (beg)
: "i" (__ARM_NR_cacheflush), "0" (beg), "r" (end), "r" (flg));
#else
// Do not use the value of __ARM_NR_cacheflush in the inline assembly
// below, because the thumb mode value would be used, which would be
// wrong, since we switch to ARM mode before executing the svc instruction
asm volatile(
"@ Enter ARM Mode \n\t"
"adr r3, 1f \n\t"
"bx r3 \n\t"
".ALIGN 4 \n\t"
".ARM \n"
"1: svc 0x9f0002 \n"
"@ Enter THUMB Mode\n\t"
"adr r3, 2f+1 \n\t"
"bx r3 \n\t"
".THUMB \n"
"2: \n\t"
: "=r" (beg)
: "0" (beg), "r" (end), "r" (flg)
: "r3");
#endif
// r7 is reserved by the EABI in thumb mode.
asm volatile(
"@ Enter ARM Mode \n\t"
"adr r3, 1f \n\t"
"bx r3 \n\t"
".ALIGN 4 \n\t"
".ARM \n"
"1: push {r7} \n\t"
"mov r7, %4 \n\t"
"svc 0x0 \n\t"
"pop {r7} \n\t"
"@ Enter THUMB Mode\n\t"
"adr r3, 2f+1 \n\t"
"bx r3 \n\t"
".THUMB \n"
"2: \n\t"
: "=r" (beg)
: "0" (beg), "r" (end), "r" (flg), "r" (__ARM_NR_cacheflush)
: "r3");
#endif
#endif
}

4
src/arm/macro-assembler-arm.cc
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@ -839,11 +839,7 @@ void MacroAssembler::LeaveExitFrame(bool save_doubles,
}
void MacroAssembler::GetCFunctionDoubleResult(const DoubleRegister dst) {
#if !defined(USE_ARM_EABI)
UNREACHABLE();
#else
vmov(dst, r0, r1);
#endif
}

10
src/arm/simulator-arm.cc
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@ -938,12 +938,7 @@ void Simulator::set_d_register_from_double(int dreg, const double& dbl) {
// 2*sreg and 2*sreg+1.
char buffer[2 * sizeof(vfp_register[0])];
memcpy(buffer, &dbl, 2 * sizeof(vfp_register[0]));
#ifndef BIG_ENDIAN_FLOATING_POINT
memcpy(&vfp_register[dreg * 2], buffer, 2 * sizeof(vfp_register[0]));
#else
memcpy(&vfp_register[dreg * 2], &buffer[4], sizeof(vfp_register[0]));
memcpy(&vfp_register[dreg * 2 + 1], &buffer[0], sizeof(vfp_register[0]));
#endif
}
@ -980,12 +975,7 @@ double Simulator::get_double_from_d_register(int dreg) {
// Read the bits from the unsigned integer vfp_register[] array
// into the double precision floating point value and return it.
char buffer[2 * sizeof(vfp_register[0])];
#ifdef BIG_ENDIAN_FLOATING_POINT
memcpy(&buffer[0], &vfp_register[2 * dreg + 1], sizeof(vfp_register[0]));
memcpy(&buffer[4], &vfp_register[2 * dreg], sizeof(vfp_register[0]));
#else
memcpy(buffer, &vfp_register[2 * dreg], 2 * sizeof(vfp_register[0]));
#endif
memcpy(&dm_val, buffer, 2 * sizeof(vfp_register[0]));
return(dm_val);
}

4
src/conversions-inl.h
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@ -60,11 +60,7 @@ static inline unsigned int FastD2UI(double x) {
if (x < k2Pow52) {
x += k2Pow52;
uint32_t result;
#ifdef BIG_ENDIAN_FLOATING_POINT
Address mantissa_ptr = reinterpret_cast<Address>(&x) + kIntSize;
#else
Address mantissa_ptr = reinterpret_cast<Address>(&x);
#endif
// Copy least significant 32 bits of mantissa.
memcpy(&result, mantissa_ptr, sizeof(result));
return negative ? ~result + 1 : result;

7
src/objects.h
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@ -1293,14 +1293,9 @@ class HeapNumber: public HeapObject {
// is a mixture of sign, exponent and mantissa. Our current platforms are all
// little endian apart from non-EABI arm which is little endian with big
// endian floating point word ordering!
#if !defined(V8_HOST_ARCH_ARM) || defined(USE_ARM_EABI)
static const int kMantissaOffset = kValueOffset;
static const int kExponentOffset = kValueOffset + 4;
#else
static const int kMantissaOffset = kValueOffset + 4;
static const int kExponentOffset = kValueOffset;
# define BIG_ENDIAN_FLOATING_POINT 1
#endif
static const int kSize = kValueOffset + kDoubleSize;
static const uint32_t kSignMask = 0x80000000u;
static const uint32_t kExponentMask = 0x7ff00000u;

4
src/v8.cc
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@ -193,11 +193,7 @@ void V8::InitializeOncePerProcess() {
// Setup the platform OS support.
OS::Setup();
#if defined(V8_TARGET_ARCH_ARM) && !defined(USE_ARM_EABI)
use_crankshaft_ = false;
#else
use_crankshaft_ = FLAG_crankshaft;
#endif
if (Serializer::enabled()) {
use_crankshaft_ = false;

14
test/cctest/test-api.cc
View File

@ -12347,28 +12347,14 @@ THREADED_TEST(GetHeapStatistics) {
static double DoubleFromBits(uint64_t value) {
double target;
#ifdef BIG_ENDIAN_FLOATING_POINT
const int kIntSize = 4;
// Somebody swapped the lower and higher half of doubles.
memcpy(&target, reinterpret_cast<char*>(&value) + kIntSize, kIntSize);
memcpy(reinterpret_cast<char*>(&target) + kIntSize, &value, kIntSize);
#else
memcpy(&target, &value, sizeof(target));
#endif
return target;
}
static uint64_t DoubleToBits(double value) {
uint64_t target;
#ifdef BIG_ENDIAN_FLOATING_POINT
const int kIntSize = 4;
// Somebody swapped the lower and higher half of doubles.
memcpy(&target, reinterpret_cast<char*>(&value) + kIntSize, kIntSize);
memcpy(reinterpret_cast<char*>(&target) + kIntSize, &value, kIntSize);
#else
memcpy(&target, &value, sizeof(target));
#endif
return target;
}