void strh_reg(uint8_t rt, uint8_t rn, uint8_t rm,
enum SRType shift_t, uint8_t shift_n) {
union apsr_t apsr = CORE_apsr_read();
uint32_t offset;
offset = Shift(CORE_reg_read(rm), 32, shift_t, shift_n, apsr.bits.C);
uint32_t address;
address = CORE_reg_read(rn) + offset;
write_halfword_unaligned(address, CORE_reg_read(rt) & 0xffff);
}
void str_reg(uint8_t rt, uint8_t rn, uint8_t rm,
enum SRType shift_t, uint8_t shift_n) {
uint32_t rn_val = CORE_reg_read(rn);
uint32_t rm_val = CORE_reg_read(rm);
uint32_t rt_val = CORE_reg_read(rt);
union apsr_t apsr = CORE_apsr_read();
uint32_t offset = Shift(rm_val, 32, shift_t, shift_n, apsr.bits.C);
uint32_t address = rn_val + offset;
uint32_t data = rt_val;
write_word_unaligned(address, data);
}
void orr_reg(uint8_t setflags, uint8_t rd, uint8_t rn, uint8_t rm,
enum SRType shift_t, uint8_t shift_n) {
uint32_t result;
bool carry_out;
union apsr_t apsr = CORE_apsr_read();
Shift_C(CORE_reg_read(rm), 32, shift_t, shift_n, apsr.bits.C, &result, &carry_out);
result = CORE_reg_read(rn) | result;
CORE_reg_write(rd, result);
if (setflags) {
apsr.bits.N = HIGH_BIT(result);
apsr.bits.Z = result == 0;
apsr.bits.C = carry_out;
CORE_apsr_write(apsr);
}
}
void bic_reg(uint8_t rd, uint8_t rn, uint8_t rm,
bool setflags, enum SRType shift_t, uint8_t shift_n) {
union apsr_t apsr = CORE_apsr_read();
uint32_t shifted;
bool carry_out;
Shift_C(CORE_reg_read(rm), 32, shift_t, shift_n, apsr.bits.C,
&shifted, &carry_out);
uint32_t result = CORE_reg_read(rn) & ~shifted;
CORE_reg_write(rd, result);
if (setflags) {
apsr.bits.N = HIGH_BIT(result);
apsr.bits.Z = result == 0;
apsr.bits.C = carry_out;
CORE_apsr_write(apsr);
}
}
EXPORT void CORE_xPSR_write(uint32_t xPSR) {
union ipsr_t i = CORE_ipsr_read();
union epsr_t e = CORE_epsr_read();
union apsr_t a = CORE_apsr_read();
i.storage &= ~xPSR_ipsr_mask;
i.storage |= xPSR & xPSR_ipsr_mask;
CORE_ipsr_write(i);
e.storage &= ~xPSR_epsr_mask;
e.storage |= xPSR & xPSR_epsr_mask;
CORE_epsr_write(e);
uint32_t apsr_mask;
if (HaveDSPExt())
apsr_mask = xPSR_apsr_dsp_mask;
else
apsr_mask = xPSR_apsr_nodsp_mask;
a.storage &= ~apsr_mask;
a.storage |= xPSR & apsr_mask;
CORE_apsr_write(a);
}
