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Impl Thumb LdrStrSp

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Untested.


Former-commit-id: 8fa842d4969e30247fc1706dfe053c7dfbb37843
This commit is contained in:
Michel Heily 2019-07-05 13:20:19 +03:00
parent be9499c76d
commit 01290f6a28
2 changed files with 25 additions and 0 deletions
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11
src/arm7tdmi/thumb/display.rs
View file

@ -74,6 +74,16 @@ impl ThumbInstruction {
)
}
fn fmt_thumb_ldr_str_sp(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"{op}\t{Rd}, [sp, #{Imm:#x}]",
op = if self.is_load() { "ldr" } else { "str" },
Rd = reg_string(self.rd()),
Imm = self.word8(),
)
}
fn fmt_thumb_add_sub(&self, f: &mut fmt::Formatter) -> fmt::Result {
let operand = if self.is_immediate_operand() {
format!("#{:x}", self.raw.bit_range(6..9))
@ -140,6 +150,7 @@ impl fmt::Display for ThumbInstruction {
ThumbFormat::HiRegOpOrBranchExchange => self.fmt_thumb_high_reg_op_or_bx(f),
ThumbFormat::LdrPc => self.fmt_thumb_ldr_pc(f),
ThumbFormat::LdrStrRegOffset => self.fmt_thumb_ldr_str_reg_offset(f),
ThumbFormat::LdrStrSp => self.fmt_thumb_ldr_str_sp(f),
ThumbFormat::AddSp => self.fmt_thumb_add_sp(f),
ThumbFormat::PushPop => self.fmt_thumb_push_pop(f),
ThumbFormat::BranchConditional => self.fmt_thumb_branch_with_cond(f),

14
src/arm7tdmi/thumb/exec.rs
View file

@ -129,6 +129,19 @@ impl Core {
Ok(CpuPipelineAction::IncPC)
}
fn exec_thumb_ldr_str_sp(&mut self, bus: &mut Bus, insn: ThumbInstruction) -> CpuExecResult {
let addr = (self.gpr[REG_SP] & !0b10) + 4 + (insn.word8() as Addr);
if insn.is_load() {
let data = self.load_32(addr, bus);
self.add_cycle();
self.gpr[insn.rd()] = data;
} else {
self.store_32(addr, self.gpr[insn.rd()], bus);
}
Ok(CpuPipelineAction::IncPC)
}
fn exec_thumb_add_sp(&mut self, bus: &mut Bus, insn: ThumbInstruction) -> CpuExecResult {
let op1 = self.gpr[REG_SP] as i32;
let op2 = insn.sword7();
@ -192,6 +205,7 @@ impl Core {
ThumbFormat::HiRegOpOrBranchExchange => self.exec_thumb_hi_reg_op_or_bx(bus, insn),
ThumbFormat::LdrPc => self.exec_thumb_ldr_pc(bus, insn),
ThumbFormat::LdrStrRegOffset => self.exec_thumb_ldr_str_reg_offset(bus, insn),
ThumbFormat::LdrStrSp => self.exec_thumb_ldr_str_sp(bus, insn),
ThumbFormat::AddSp => self.exec_thumb_add_sp(bus, insn),
ThumbFormat::PushPop => self.exec_thumb_push_pop(bus, insn),
ThumbFormat::BranchConditional => self.exec_thumb_branch_with_cond(bus, insn),