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fixed a bug with LINK instruction not saving address register

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This commit is contained in:
Markus Fröschle
2014-09-06 19:27:11 +00:00
parent 3cfcd9e7c3
commit 307c5368b4
2 changed files with 81 additions and 78 deletions
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3
BaS_gcc/.gdbinit
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@@ -1,7 +1,8 @@
#set disassemble-next-line on
define tr
!killall m68k-bdm-gdbserver
#!killall m68k-bdm-gdbserver
target remote | m68k-bdm-gdbserver pipe /dev/bdmcf3
#target remote localhost:1234
#target remote | m68k-bdm-gdbserver pipe /dev/tblcf3
#target dbug /dev/ttyS0
#monitor bdm-reset

34
BaS_gcc/sys/exceptions.S
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@@ -208,7 +208,7 @@
/**********************************************************/
.altmacro
.macro irq vector,int_mask,clr_int
move.w #0x2700,sr // disable interrupt
//move.w #0x2700,sr // disable interrupt
subq.l #8,a7
movem.l d0/a5,(a7) // save registers
@@ -326,7 +326,7 @@ init_vec_loop:
*/
vector_table_start:
std_exc_vec:
move.w #0x2700,sr // disable interrupt
//move.w #0x2700,sr // disable interrupt
subq.l #8,a7
movem.l d0/a5,(sp) // save registers
move.w 8(sp),d0 // fetch vector
@@ -365,9 +365,9 @@ noprint:
move.l 4(sp),a5 // restore a5
move.l d0,4(a7) // store exception routine address
move.w 10(a7),d0 // restore original SR
bset #13,d0 // set supervisor bit
move.w d0,sr //
//move.w 10(a7),d0 // restore original SR
//bset #13,d0 // set supervisor bit
//move.w d0,sr //
move.l (a7)+,d0 // restore d0
rts // jump to exception routine
@@ -409,15 +409,15 @@ access_mmu:
cmp.l #__FASTRAM_END,d0 // above max User RAM area?
bge bus_error // -> bus error
lea -5*4(sp),sp // save gcc scratch registers
movem.l d0-d1/a0-a2,(sp)
lea -3 * 4(sp),sp // save gcc scratch registers
movem.l d1/a0-a1,(sp)
move.l d0,-(sp) // fault address
jsr _mmutr_miss // else we have an MMU TLB miss
addq.l #4,sp
movem.l (sp),d0-d1/a0-a2 // restore gcc scratch registers
lea 5*4(sp),sp
movem.l (sp),d1/a0-a1 // restore gcc scratch registers
lea 3 * 4(sp),sp
move.l (sp)+,d0 // restore register
@@ -995,16 +995,18 @@ video_chg_end:
.extern _isr_execute_handler
_lowlevel_isr_handler:
move.w #0x2700,sr // disable interrupts
link a6,#-4*4 // make room for
movem.l d0-d1/a0-a1,(sp) // gcc scratch registers and save them
move.w #0x2700,sr
lea -5 * 4(sp),sp // make room for
movem.l d0-d1/a0-a2,(sp) // gcc scratch registers and save them,
// other registers will be handled by gcc itself
move.w 4(a6),d0 // fetch vector number from stack
move.w 5 * 4(sp),d0 // fetch vector number from stack
lsr.l #2,d0 // move it in place
andi.l #0x000000ff,d0 // mask it out
move.l d0,-(sp) // push it
jsr _isr_execute_handler // call the C handler
lea 4(sp),sp // adjust stack
movem.l (sp),d0-d1/a0-a1 // restore registers
unlk a6 // cleanup stack
addq.l #4,sp // adjust stack
movem.l (sp),d0-d1/a0-a2 // restore registers
lea 5 * 4(sp),sp
rte