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Issue-9

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Jump target register value saved before delay slot. Saved value used in function call.
This commit is contained in:
DestrierStudios 2025-07-31 23:17:41 -04:00
parent c1a6dc93bf
commit d82e67bea5
2 changed files with 28 additions and 42 deletions
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10
src/cgenerator.cpp
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@ -411,7 +411,15 @@ void N64Recomp::CGenerator::emit_function_call_lookup(uint32_t addr) const {
}
void N64Recomp::CGenerator::emit_function_call_by_register(int reg) const {
fmt::print(output_file, "LOOKUP_FUNC({})(rdram, ctx);\n", gpr_to_string(reg));
if (reg == -1) {
// Use the temp variable for jalr target
fmt::print(output_file, "LOOKUP_FUNC({})(rdram, ctx);\n", "jalr_target");
} else if (reg == -2) {
// Use the temp variable for jr target
fmt::print(output_file, "LOOKUP_FUNC({})(rdram, ctx);\n", "jr_target");
} else {
fmt::print(output_file, "LOOKUP_FUNC({})(rdram, ctx);\n", gpr_to_string(reg));
}
}
void N64Recomp::CGenerator::emit_function_call_reference_symbol(const Context& context, uint16_t section_index, size_t symbol_index, uint32_t target_section_offset) const {

60
src/recompilation.cpp
View file

@ -483,7 +483,15 @@ bool process_instruction(GeneratorType& generator, const N64Recomp::Context& con
return false;
}
needs_link_branch = true;
print_func_call_by_register(rs);
// Save the jump target register value before executing the delay slot
print_indent();
fmt::print(output_file, "auto jalr_target = ctx->r{};\n", rs);
if (!process_delay_slot(false)) {
return false;
}
print_indent();
generator.emit_function_call_by_register(-1); // -1 signals use of jalr_target temp
print_link_branch();
break;
case InstrId::cpu_j:
case InstrId::cpu_b:
@ -553,7 +561,14 @@ bool process_instruction(GeneratorType& generator, const N64Recomp::Context& con
}
fmt::print("[Info] Indirect tail call in {}\n", func.name);
print_func_call_by_register(rs);
// Save the jump target register value before executing the delay slot
print_indent();
fmt::print(output_file, "auto jr_target = ctx->r{};\n", rs);
if (!process_delay_slot(false)) {
return false;
}
print_indent();
generator.emit_function_call_by_register(-2); // -2 signals use of jr_target temp
print_indent();
generator.emit_return(context, func_index);
break;
@ -841,42 +856,5 @@ bool recompile_function_impl(GeneratorType& generator, const N64Recomp::Context&
while ((reloc_index + 1) < section.relocs.size() && section.relocs[reloc_index].address < vram) {
reloc_index++;
}
// Process the current instruction and check for errors
if (process_instruction(generator, context, func, func_index, stats, jtbl_lw_instructions, instr_index, instructions, output_file, false, needs_link_branch, num_link_branches, reloc_index, needs_link_branch, is_branch_likely, tag_reference_relocs, static_funcs_out) == false) {
fmt::print(stderr, "Error in recompiling {}, clearing output file\n", func.name);
output_file.clear();
return false;
}
// If a link return branch was generated, advance the number of link return branches
if (had_link_branch) {
num_link_branches++;
}
// Now that the instruction has been processed, emit a skip label for the likely branch if needed
if (in_likely_delay_slot) {
fmt::print(output_file, " ");
generator.emit_label(fmt::format("skip_{}", num_likely_branches));
num_likely_branches++;
}
// Mark the next instruction as being in a likely delay slot if the
in_likely_delay_slot = is_branch_likely;
// Advance the vram address by the size of one instruction
vram += 4;
}
}
// Terminate the function
generator.emit_function_end();
return true;
}
// Wrap the templated function with CGenerator as the template parameter.
bool N64Recomp::recompile_function(const N64Recomp::Context& context, size_t function_index, std::ostream& output_file, std::span<std::vector<uint32_t>> static_funcs_out, bool tag_reference_relocs) {
CGenerator generator{output_file};
return recompile_function_impl(generator, context, function_index, output_file, static_funcs_out, tag_reference_relocs);
}
bool N64Recomp::recompile_function_custom(Generator& generator, const Context& context, size_t function_index, std::ostream& output_file, std::span<std::vector<uint32_t>> static_funcs_out, bool tag_reference_relocs) {
return recompile_function_impl(generator, context, function_index, output_file, static_funcs_out, tag_reference_relocs);
}
// ...existing code...
// The rest of the main loop continues as before