Update of /cvsroot/linux-vax/kernel-2.4/arch/vax/kernel
In directory usw-pr-cvs1:/tmp/cvs-serv8907
Modified Files:
ptrace.c
Log Message:
DA: ptrace getreg/putreg should be more functional if not correct
Index: ptrace.c
===================================================================
RCS file: /cvsroot/linux-vax/kernel-2.4/arch/vax/kernel/ptrace.c,v
retrieving revision 1.2
retrieving revision 1.3
diff -u -r1.2 -r1.3
--- ptrace.c 2001/11/04 21:58:32 1.2
+++ ptrace.c 2001/11/08 22:17:16 1.3
@@ -31,16 +31,21 @@
static int putreg(struct task_struct *child,
unsigned long regno, unsigned long value)
{
- printk("putreg called with regno %d\n", regno);
+ unsigned long retval = ~0UL;
+ void *stack_top;
+ struct pt_regs *regs_ptr;
+
+ stack_top = ((union task_union *)child)+1;
+ stack_top -= 4;
+
+ regs_ptr = stack_top - 16 - sizeof(struct pt_regs);
+
+ printk("putreg called with regno %d\n", regno>>2);
switch(regno >> 2) {
- case 0 ... 13:
- *(unsigned long *)((&child->thread.pcb)+4+(regno>>2))=value;
- break;
- case PT_SP:
- child->thread.pcb.usp=value;
- break;
- case PT_PC:
- child->thread.pcb.pc=value;
+ case 0 ... 16:
+ // retval = *(((unsigned long *)regs_ptr) + (regno>>2));
+ *(((unsigned long *)regs_ptr) + (regno>>2)) = value;
+ // *(unsigned long *)((&child->thread.pcb)+4+(regno>>2))=value;
break;
default:
printk("putreg for %d failed\n", regno);
@@ -55,27 +60,23 @@
unsigned long regno)
{
unsigned long retval = ~0UL;
+ void *stack_top;
+ struct pt_regs *regs_ptr;
+
+ stack_top = ((union task_union *)child)+1;
+ stack_top -= 4;
- /* this code takes the register from the PCB for the process. PC is reg 15 but 14'th after R0 in
- the pcb so it is special cased. have to add some stack pointers at some stage */
+ /* get the registers from where we shoved them on the stack at the last
+ exception for this process.. not sure if this is always correct but
+ will do for now - 4 longwords back from end of stack is end of regs */
+
+ regs_ptr = stack_top - 16 - sizeof(struct pt_regs);
+
+
switch(regno >> 2) {
- case 0 ... 13:
- retval = (unsigned long)*(unsigned long *)((&child->thread.pcb)+4+(regno>>2));
- break;
- case PT_SP:
- retval = child->thread.pcb.usp;
- break;
- case PT_PC:
- {
- int i;
- struct pt_regs regs;
-
- // hex_dump((void *)(child->thread.pcb.ksp-0x80), 256);
- // printk("ksp:%8lX ap:%8lX fp:%8lX\n", child->thread.pcb.ksp, child->thread.pcb.ap, child->thread.pcb.ksp+0x64);
- /* FIXME: explain 0x64 == 100 = 25 * 4 pc is stored 25 longs into stack.... */
- retval = (unsigned long)*(unsigned long *)(child->thread.pcb.ksp + 0x64);
+ case 0 ... 16:
+ retval = *(((unsigned long *)regs_ptr) + (regno>>2));
break;
- }
default:
printk("getreg for %d failed\n", regno);
retval=0;
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