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