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MipsStackWalk: Detect leaf functions.

This commit is contained in:
Ziemas 2023-10-24 23:03:26 +02:00 committed by refractionpcsx2
parent 715bc94bd9
commit e1bfd95f63
1 changed files with 16 additions and 1 deletions
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17
pcsx2/DebugTools/MipsStackWalk.cpp
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@ -135,12 +135,27 @@ namespace MipsStackWalk
u32 rawOp = cpu->read32(pc);
const R5900::OPCODE& op = R5900::GetInstruction(rawOp);
// Here's where they store the ra address.
// Look for RA write to ram
if (IsSWInstr(op) && _RT == MIPS_REG_RA && _RS == MIPS_REG_SP)
{
ra_offset = _IMM16;
}
// Look for previous function end
if (IsJRInstr(op) && _RS == MIPS_REG_RA)
{
// Found previous function end
// Since no stack setup was found assume this is a leaf
// with no stack usage
pc = pc + 8;
frame.entry = pc;
frame.stackSize = 0;
return true;
}
// Look for the frame allocation stack pointer subtraction
if (IsAddImmInstr(op) && _RT == MIPS_REG_SP && _RS == MIPS_REG_SP)
{
// A positive imm either means alloca() or we went too far.