Mercurial > hg > Members > kono > nitros9-code
changeset 2010:a9560d9f59d1
Fixed bug where SP wasn't properly set when invoking F$Debug from system state. Now the stack pointer is retrieved some known offset from the current SP value. Kind of a kludge, but it works (so far).
| author | boisy |
|---|---|
| date | Mon, 06 Mar 2006 00:39:16 +0000 |
| parents | a293c4ba6084 |
| children | 484c5493599a |
| files | 3rdparty/p2mods/noice/noice.asm |
| diffstat | 1 files changed, 27 insertions(+), 4 deletions(-) [+] |
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--- a/3rdparty/p2mods/noice/noice.asm Sun Mar 05 15:11:20 2006 +0000 +++ b/3rdparty/p2mods/noice/noice.asm Mon Mar 06 00:39:16 2006 +0000 @@ -81,6 +81,7 @@ callregs RMB 2 firsttime RMB 1 IFGT Level-1 +syssp RMB 2 ssflag RMB 1 ENDC IFNE MPI @@ -173,6 +174,16 @@ clra we aren't in system state bra dbgcont dbgentss ldx <D.DbgMem + +* Interesting trick here... I cannot see where the kernel stores the stack +* register when processing a system call in system state. I observed that +* the actual value of S was $15 bytes from where S is when entering the +* system call. We'll see how this holds up during system state debugging, +* and whether changes to the kernel will affect this offset. + leas $15,s + sts <syssp,x + leas -$15,s + lda #$01 dbgcont sta <ssflag,x ENDC @@ -522,9 +533,15 @@ ldd R$PC,y exg a,b std ,x PC - ldy <D.Proc get SP from proc desc + IFGT Level-1 + tst <ssflag,u system state? + beq us@ + ldd <syssp,u + bra cmn@ + ENDC +us@ ldy <D.Proc get SP from proc desc ldd P$SP,y - exg a,b +cmn@ exg a,b std combuff+4,u lbsr _sendtohost lbra mainloop @@ -579,9 +596,15 @@ std R$PC,y ldd combuff+4,u exg a,b - ldy <D.Proc + IFGT Level-1 + tst <ssflag,u + beq us@ + std <syssp,u + bra cmn@ + ENDC +us@ ldy <D.Proc std P$SP,y - ldd #$0100 +cmn@ ldd #$0100 std combuff+1,u lbsr _sendtohost lbra mainloop