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Resolves potential flaw in POPping here.

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This commit is contained in:
Thomas Harte 2021-04-25 13:26:53 -04:00
parent a5098a60ec
commit 9b65d56ed0
1 changed files with 5 additions and 6 deletions
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11
Storage/State/SNA.cpp
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@ -70,12 +70,11 @@ std::unique_ptr<Analyser::Static::Target> SNA::load(const std::string &file_name
// 1B– 48kb RAM contents
state->ram = file.read(48*1024);
// Establish program counter.
state->z80.registers.program_counter = state->ram[state->z80.registers.stack_pointer];
state->ram[state->z80.registers.stack_pointer] = 0;
state->z80.registers.program_counter |= state->ram[state->z80.registers.stack_pointer+1] << 8;
state->ram[state->z80.registers.stack_pointer+1] = 0;
state->z80.registers.stack_pointer += 2;
// To establish program counter, point it to a RET that
// I know is in the 16/48kb ROM. This avoids having to
// try to do a pop here, given that the true program counter
// might currently be in the ROM.
state->z80.registers.program_counter = 0x1d83;
return result;
}