58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
|
#include "kernel/kernel.h"
|
||
|
|
#include "arch_proto.h"
|
||
|
|
|
||
|
|
#include "debugreg.h"
|
||
|
|
|
||
|
|
int breakpoint_set(phys_bytes linaddr, int bp, const int flags)
|
||
|
|
{
|
||
|
|
unsigned long dr7, dr7flags;
|
||
|
|
|
||
|
|
if (bp >= BREAKPOINT_COUNT)
|
||
|
|
return EINVAL;
|
||
|
|
|
||
|
|
/* convert flags */
|
||
|
|
dr7flags = 0;
|
||
|
|
switch (flags & BREAKPOINT_FLAG_RW_MASK) {
|
||
|
|
case BREAKPOINT_FLAG_RW_EXEC: dr7flags |= DR7_RW_EXEC(bp); break;
|
||
|
|
case BREAKPOINT_FLAG_RW_WRITE: dr7flags |= DR7_RW_WRITE(bp); break;
|
||
|
|
case BREAKPOINT_FLAG_RW_RW: dr7flags |= DR7_RW_RW(bp); break;
|
||
|
|
default: return EINVAL;
|
||
|
|
}
|
||
|
|
switch (flags & BREAKPOINT_FLAG_LEN_MASK) {
|
||
|
|
case BREAKPOINT_FLAG_LEN_1: dr7flags |= DR7_LN_1(bp); break;
|
||
|
|
case BREAKPOINT_FLAG_LEN_2: dr7flags |= DR7_LN_2(bp); break;
|
||
|
|
case BREAKPOINT_FLAG_LEN_4: dr7flags |= DR7_LN_4(bp); break;
|
||
|
|
default: return EINVAL;
|
||
|
|
}
|
||
|
|
switch (flags & BREAKPOINT_FLAG_MODE_MASK) {
|
||
|
|
case BREAKPOINT_FLAG_MODE_OFF: break;
|
||
|
|
case BREAKPOINT_FLAG_MODE_LOCAL: dr7flags |= DR7_L(bp); break;
|
||
|
|
case BREAKPOINT_FLAG_MODE_GLOBAL: dr7flags |= DR7_G(bp); break;
|
||
|
|
default: return EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* disable breakpoint before setting address */
|
||
|
|
dr7 = st_dr7();
|
||
|
|
dr7 &= ~(DR7_L(bp) | DR7_G(bp) | DR7_RW_MASK(bp) | DR7_LN_MASK(bp));
|
||
|
|
ld_dr7(dr7);
|
||
|
|
|
||
|
|
/* need to set new breakpoint? */
|
||
|
|
if ((flags & BREAKPOINT_FLAG_MODE_MASK) == BREAKPOINT_FLAG_MODE_OFF)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
/* set breakpoint address */
|
||
|
|
switch (bp) {
|
||
|
|
case 0: ld_dr0(linaddr); break;
|
||
|
|
case 1: ld_dr1(linaddr); break;
|
||
|
|
case 2: ld_dr2(linaddr); break;
|
||
|
|
case 3: ld_dr3(linaddr); break;
|
||
|
|
default: panic("%s:%d: invalid breakpoint index", __FILE__, __LINE__);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* set new flags */
|
||
|
|
dr7 |= dr7flags;
|
||
|
|
ld_dr7(dr7);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|