[Rpcemu] Patch to implement power-off via Portable_CommandBMU

diff -r 65e3e8e126e5 src/arm_common.c
--- a/src/arm_common.c Wed Oct 24 17:24:45 2018 +0100
+++ b/src/arm_common.c Mon May 20 20:34:55 2019 +0100
@@ -40,6 +40,7 @@
#define SWI_OS_CallASWI 0x6f
#define SWI_OS_CallASWIR12 0x71

+#define SWI_Portable_CommandBMU 0x42fc4
#define SWI_Portable_ReadFeatures 0x42fc5
#define SWI_Portable_Idle 0x42fc6

@@ -362,6 +363,12 @@
swinum = arm.reg[12] & 0xdffff;
}

+ /* Intercept Portable_CommandBMU to turn off */
+ if (swinum == SWI_Portable_CommandBMU) {
+ if (arm.reg[0] == 1) /* Remove power */
+ exit(0); // FIXME
+ }
+
/* Intercept RISC OS Portable SWIs to enable RPCEmu to sleep when
RISC OS is idle */
if (config.cpu_idle) {

Following Peter Howkins's suggestion, here attached is part one of support for powering off from inside the emulator: an implementation of Portable_CommandBMU with R0=1 (= remove power).

I couldn't work out how to exit the emulator cleanly. As far as I can see that is only currently done from the front end. I tried setting quited = 1, but the emulator freezes and then crashes a little while later.

For testing purposes therefore I simply call exit(0); if someone could let me know what I should be doing, I'd be most grateful!

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