int main(void)
{
printf("add2(%d, %d) = %d\n", 3, 1, add2(3, 1));
printf("add3(%d, %d, %d) = %d\n", 1, 3, 1, add3(1, 3, 1));
printf("bic(%d, %d) = %d\n", 3, 1, bic(3, 1));
printf("mvn(%d, %d) = %d\n", 3, 1, mvn(3, 1));
printf("rsb3(%d, %d, %d) = %d\n", 3, 1, 1, rsb3(3, 1, 1));
printf("rsb1(%d) = %d\n", 3, rsb1(3));
return 0;
}
void InterpreterStubs::generate_current_thread_to_primordial() {
Segment seg(this, code_segment, "Current thread to primordial");
bind_global("current_thread_to_primordial");
comment("Set up global pointer, as we can be called from C code");
ldr_gp_base(gp);
bind_global("current_thread_to_primordial_fast");
// We're never going to return to this thread, so it doesn't matter if
// it doesn't look like a stopped Java thread anymore.
get_primordial_sp(sp);
comment("restore permanent registers (including return address)");
ldr(lr, imm_index(sp, BytesPerWord, post_indexed));
ldmfd(sp, range(r3, r11), writeback);
jmpx(lr);
if (GenerateDebugAssembly) {
bind_local("interpreter_bkpt");
get_gp_bytecode_counter(tmp3);
add(tmp3, tmp3, imm(1));
set_gp_bytecode_counter(tmp3);
mov(pc, reg(tmp0));
}
#if ENABLE_XSCALE_WMMX_TIMER_TICK && !ENABLE_TIMER_THREAD
// set timer_tick from WMMX wCASF register
comment("wmmx_set_timer_tick to set timer_tick from WMMX register");
bind_global("wmmx_set_timer_tick");
// tmrc(r2, wCASF);
define_long(0xEE132110);
mvn(r3, imm(4) );
andr(r2, r2, reg(r3) );
// tmcr(wCASF, r2);
define_long(0xEE032110);
jmpx(lr);
// clear timer_tick from WMMX wCASF register
comment("wmmx_set_timer_tick to clear timer_tick from WMMX register");
bind_global("wmmx_clear_timer_tick");
define_long(0xEE100060);
// wcmpgtub(wR0, wR0, wR0);
jmpx(lr);
#endif // ENABLE_XSCALE_WMMX_TIMER_TICK && !ENABLE_TIMER_THREAD
}
void MacroAssembler::atomic_cas_bool(Register oldval, Register newval, Register base, int offset, Register tmpreg) {
if (VM_Version::supports_ldrex()) {
Register tmp_reg;
if (tmpreg == noreg) {
push(LR);
tmp_reg = LR;
} else {
tmp_reg = tmpreg;
}
assert_different_registers(tmp_reg, oldval, newval, base);
Label loop;
bind(loop);
ldrex(tmp_reg, Address(base, offset));
subs(tmp_reg, tmp_reg, oldval);
strex(tmp_reg, newval, Address(base, offset), eq);
cmp(tmp_reg, 1, eq);
b(loop, eq);
cmp(tmp_reg, 0);
if (tmpreg == noreg) {
pop(tmp_reg);
}
} else if (VM_Version::supports_kuser_cmpxchg32()) {
// On armv5 platforms we must use the Linux kernel helper
// function for atomic cas operations since ldrex/strex is
// not supported.
//
// This is a special routine at a fixed address 0xffff0fc0 with
// with these arguments and results
//
// input:
// r0 = oldval, r1 = newval, r2 = ptr, lr = return adress
// output:
// r0 = 0 carry set on success
// r0 != 0 carry clear on failure
//
// r3, ip and flags are clobbered
//
Label loop;
push(RegisterSet(R0, R3) | RegisterSet(R12) | RegisterSet(LR));
Register tmp_reg = LR; // ignore the argument
assert_different_registers(tmp_reg, oldval, newval, base);
// Shuffle registers for kernel call
if (oldval != R0) {
if (newval == R0) {
mov(tmp_reg, newval);
newval = tmp_reg;
}
if (base == R0) {
mov(tmp_reg, base);
base = tmp_reg;
}
mov(R0, oldval);
}
if(newval != R1) {
if(base == R1) {
if(newval == R2) {
mov(tmp_reg, base);
base = tmp_reg;
}
else {
mov(R2, base);
base = R2;
}
}
mov(R1, newval);
}
if (base != R2)
mov(R2, base);
if (offset != 0)
add(R2, R2, offset);
mvn(R3, 0xf000);
mov(LR, PC);
sub(PC, R3, 0x3f);
cmp (R0, 0);
pop(RegisterSet(R0, R3) | RegisterSet(R12) | RegisterSet(LR));
} else {
// Should never run on a platform so old that it does not have kernel helper
stop("Atomic cmpxchg32 unsupported on this platform");
}
}
void MacroAssembler::atomic_cas64(Register memval_lo, Register memval_hi, Register result, Register oldval_lo, Register oldval_hi, Register newval_lo, Register newval_hi, Register base, int offset) {
if (VM_Version::supports_ldrexd()) {
Label loop;
assert_different_registers(memval_lo, memval_hi, result, oldval_lo,
oldval_hi, newval_lo, newval_hi, base);
assert(memval_hi == memval_lo + 1 && memval_lo < R9, "cmpxchg_long: illegal registers");
assert(oldval_hi == oldval_lo + 1 && oldval_lo < R9, "cmpxchg_long: illegal registers");
assert(newval_hi == newval_lo + 1 && newval_lo < R9, "cmpxchg_long: illegal registers");
assert(result != R10, "cmpxchg_long: illegal registers");
assert(base != R10, "cmpxchg_long: illegal registers");
mov(result, 0);
bind(loop);
ldrexd(memval_lo, Address(base, offset));
cmp(memval_lo, oldval_lo);
cmp(memval_hi, oldval_hi, eq);
strexd(result, newval_lo, Address(base, offset), eq);
rsbs(result, result, 1, eq);
b(loop, eq);
} else if (VM_Version::supports_kuser_cmpxchg64()) {
// On armv5 platforms we must use the Linux kernel helper
// function for atomic cas64 operations since ldrexd/strexd is
// not supported.
//
// This is a special routine at a fixed address 0xffff0f60
//
// input:
// r0 = (long long *)oldval, r1 = (long long *)newval,
// r2 = ptr, lr = return adress
// output:
// r0 = 0 carry set on success
// r0 != 0 carry clear on failure
//
// r3, and flags are clobbered
//
Label done;
Label loop;
if (result != R12) {
push(R12);
}
push(RegisterSet(R10) | RegisterSet(LR));
mov(R10, SP); // Save SP
bic(SP, SP, StackAlignmentInBytes - 1); // align stack
push(RegisterSet(oldval_lo, oldval_hi));
push(RegisterSet(newval_lo, newval_hi));
if ((offset != 0) || (base != R12)) {
add(R12, base, offset);
}
push(RegisterSet(R0, R3));
bind(loop);
ldrd(memval_lo, Address(R12)); //current
ldrd(oldval_lo, Address(SP, 24));
cmp(memval_lo, oldval_lo);
cmp(memval_hi, oldval_hi, eq);
pop(RegisterSet(R0, R3), ne);
mov(result, 0, ne);
b(done, ne);
// Setup for kernel call
mov(R2, R12);
add(R0, SP, 24); // R0 == &oldval_lo
add(R1, SP, 16); // R1 == &newval_lo
mvn(R3, 0xf000); // call kernel helper at 0xffff0f60
mov(LR, PC);
sub(PC, R3, 0x9f);
b(loop, cc); // if Carry clear then oldval != current
// try again. Otherwise, return oldval
// Here on success
pop(RegisterSet(R0, R3));
mov(result, 1);
ldrd(memval_lo, Address(SP, 8));
bind(done);
pop(RegisterSet(newval_lo, newval_hi));
pop(RegisterSet(oldval_lo, oldval_hi));
mov(SP, R10); // restore SP
pop(RegisterSet(R10) | RegisterSet(LR));
if (result != R12) {
pop(R12);
}
} else {
stop("Atomic cmpxchg64 unsupported on this platform");
}
}
void MacroAssembler::atomic_cas(Register temp1, Register temp2, Register oldval, Register newval, Register base, int offset) {
if (temp1 != R0) {
// try to read the previous value directly in R0
if (temp2 == R0) {
// R0 declared free
temp2 = temp1;
temp1 = R0;
} else if ((oldval != R0) && (newval != R0) && (base != R0)) {
// free, and scratched on return
temp1 = R0;
}
}
if (VM_Version::supports_ldrex()) {
Label loop;
assert_different_registers(temp1, temp2, oldval, newval, base);
bind(loop);
ldrex(temp1, Address(base, offset));
cmp(temp1, oldval);
strex(temp2, newval, Address(base, offset), eq);
cmp(temp2, 1, eq);
b(loop, eq);
if (temp1 != R0) {
mov(R0, temp1);
}
} else if (VM_Version::supports_kuser_cmpxchg32()) {
// On armv5 platforms we must use the Linux kernel helper
// function for atomic cas operations since ldrex/strex is
// not supported.
//
// This is a special routine at a fixed address 0xffff0fc0
//
// input:
// r0 = oldval, r1 = newval, r2 = ptr, lr = return adress
// output:
// r0 = 0 carry set on success
// r0 != 0 carry clear on failure
//
// r3, ip and flags are clobbered
//
Label done;
Label loop;
push(RegisterSet(R1, R4) | RegisterSet(R12) | RegisterSet(LR));
if ( oldval != R0 || newval != R1 || base != R2 ) {
push(oldval);
push(newval);
push(base);
pop(R2);
pop(R1);
pop(R0);
}
if (offset != 0) {
add(R2, R2, offset);
}
mov(R4, R0);
bind(loop);
ldr(R0, Address(R2));
cmp(R0, R4);
b(done, ne);
mvn(R12, 0xf000);
mov(LR, PC);
sub(PC, R12, 0x3f);
b(loop, cc);
mov(R0, R4);
bind(done);
pop(RegisterSet(R1, R4) | RegisterSet(R12) | RegisterSet(LR));
} else {
// Should never run on a platform so old that it does not have kernel helper
stop("Atomic cmpxchg32 unsupported on this platform");
}
}
void Macros::arith_imm(Opcode opcode, Register rd, Register rn, int imm32,
const LiteralAccessor* la, CCMode s, Condition cond) {
GUARANTEE(rd <= r15 && rn <= r15, "Invalid register used");
Address1 result;
if (is_rotated_imm(imm32, result)) {
// Simplest case. We can handle the immediate directly
arith(opcode, rd, rn, result, s, cond);
return;
}
int alt_opcode_type = OpcodeInfo::table[opcode].alt_opcode_type;
int alt_imm32 = alt_opcode_type == alt_NEG ? -imm32 : ~imm32;
Opcode alt_opcode = (Opcode)OpcodeInfo::table[opcode].alt_opcode;
if (alt_opcode_type != alt_NONE && is_rotated_imm(alt_imm32, result)) {
// We can handle the negated/complemented immediate
arith(alt_opcode, rd, rn, result, s, cond);
return;
}
// Is the imm32, or some rotated or shifted form of it already available
if (la != NULL && la->has_literal(imm32, result)) {
arith(opcode, rd, rn, result, s, cond);
return;
}
if (alt_opcode_type != alt_NONE &&
la != NULL && la->has_literal(alt_imm32, result)) {
arith(alt_opcode, rd, rn, result, s, cond);
return;
}
// Let's see if we can split either imm32 or alt_imm32 into two pieces,
// each of which can be represented as an immediate.
if ((rd != pc) && (s == no_CC || opcode <= _eor || opcode >= _orr)) {
// Don't even try if we're setting the pc, or if this is an "arithmetic"
// rather than a logical operation. (For arithmetic operations, the C
// and V bit have meanings that cannot be reproduced by splitting)
if (OpcodeInfo::table[opcode].twoword_allowed) {
if (arith2_imm(opcode, rd, rn, imm32, s, cond)) {
return;
}
}
if (alt_opcode_type != alt_NONE
&& OpcodeInfo::table[alt_opcode].twoword_allowed){
// Can we break up alt_imm32 into two pieces, each an immediate?
if (arith2_imm(alt_opcode, rd, rn, alt_imm32, s, cond)) {
return;
}
}
}
if (opcode == _eor && imm32 == -1) {
// This is the only chance we have of optimizing ~X
mvn(rd, reg(rn), s, cond);
return;
}
if (opcode == _mov) {
ldr_big_integer(rd, imm32, cond);
return;
}
// We include the (opcode != _mov) below, even though it isn't necessary,
// since on the XScale we may want to get of the preceding clause.
if (opcode != _mov) {
Register tmp = (la != NULL) ? la->get_literal(imm32) : Assembler::no_reg;
if (tmp != no_reg) {
GUARANTEE(rn != tmp, "register must be different");
arith(opcode, rd, rn, reg(tmp), s, cond);
la->free_literal();
return;
}
}
// We are desperate. We are clearly in some test suite situation that
// is purposely generating a large immediate when that shouldn't
// normally happen. Let's just deal with it
if ((rd != pc) && (s == no_CC || opcode <= _eor || opcode >= _orr)) {
if (OpcodeInfo::table[opcode].twoword_allowed) {
arith4_imm(opcode, rd, rn, imm32, s, cond);
return;
}
if (alt_opcode_type != alt_NONE &&
OpcodeInfo::table[alt_opcode].twoword_allowed){
arith4_imm(alt_opcode, rd, rn, alt_imm32, s, cond);
return;
}
}
SHOULD_NOT_REACH_HERE();
}