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Matheus
91ec85d8ca
Panics currently lack backtraces, which are a very useful thing to have. Make the profiling backtrace function generic and print backtraces using it.
54 lines
1017 B
C
54 lines
1017 B
C
#include <arch/backtrace.h>
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#include <stdint.h>
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static bool valid_rip(void *rip) {
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if ((uint64_t)rip < (uint64_t)0xffffffff80000000)
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return false;
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return true;
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}
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// TODO 5-level paging support?
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static bool valid_frame(void *frame, void *old_frame) {
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if ((uint64_t)frame < (uint64_t)0xffff800000000000)
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return false;
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if ((uint64_t)frame >= (uint64_t)0xffffffff80000000)
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return false;
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if ((uint64_t)old_frame >= (uint64_t)frame)
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return false;
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return true;
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}
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void arch_get_backtrace(context_t *cpu_context, backtrace_fn_t fn, void *context) {
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if (!valid_rip((void *)cpu_context->rip))
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return;
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if (!fn(context, (void *)cpu_context->rip))
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return;
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size_t loops = 0;
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uint64_t *rbp = (uint64_t *)cpu_context->rbp;
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uint64_t *old_frame = NULL;
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for (;;) {
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if (!valid_frame(rbp, old_frame))
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return;
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void *rip = (void *)*(rbp + 1);
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if (!valid_rip(rip))
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return;
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if (!fn(context, rip))
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return;
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old_frame = rbp;
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rbp = (uint64_t *)*rbp;
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if (++loops == 256)
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return;
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}
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}
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