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fix ST RAM values for initial SP & PC to allow FreeMint reboots on CTRL-ALT-DELETE

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This commit is contained in:
Markus Fröschle
2016-04-02 10:39:26 +00:00
parent 11628b7167
commit 181a83db5a
2 changed files with 11 additions and 1 deletions
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10
sys/BaS.c
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@@ -529,6 +529,16 @@ void BaS(void)
FireTOS(); // Should never return FireTOS(); // Should never return
} }
/*
* fix initial pc/sp in ST RAM for FreeMiNT. It expects valid values there
* like on original STs (where these values reside in ROM) and uses them on
* CTRL-ALT-DELETE reboots.
*/
struct rom_header *bas_header = (struct rom_header *) TARGET_ADDRESS;
struct rom_header *stram_header = (struct rom_header *) 0x0;
*stram_header = *bas_header;
xprintf("call EmuTOS\r\n"); xprintf("call EmuTOS\r\n");
struct rom_header *os_header = (struct rom_header *) TOS; struct rom_header *os_header = (struct rom_header *) TOS;
os_header->initial_pc(); os_header->initial_pc();

2
sys/exceptions.S
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@@ -581,7 +581,7 @@ _lowlevel_isr_handler:
jsr _isr_execute_handler // call the C handler jsr _isr_execute_handler // call the C handler
addq.l #4,sp // adjust stack addq.l #4,sp // adjust stack
tst.b d0 // handled? tst.b d0 // handled?
beq lowlevel_forward // no, forward it to TOS beq lowlevel_forward // no, forward it to TOS
movem.l (sp),d0-d1/a0-a1 // restore registers movem.l (sp),d0-d1/a0-a1 // restore registers
unlk a6 unlk a6