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https://github.com/Mathewnd/Astral.git
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Matheus
ac6addd527
Add support for mapping kernel .text addresses into file + function + offset for debugging purposes. Make the backtrace use this new feature.
46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
#include <dbg.h>
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#include <stddef.h>
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#include <stdint.h>
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#ifdef __x86_64__
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#define LOAD_BASE (uint64_t)0xffffffff80000000
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#endif
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#define SYM_TABLE_ENTRY_SIZE 3
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extern uint32_t dbg_sym_table[];
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extern uint32_t dbg_sym_table_end[];
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extern char dbg_fn_name_table[];
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extern char dbg_fn_name_table_end[];
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extern char dbg_file_name_table[];
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extern char dbg_file_name_table_end[];
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void dbg_get_symbol(void *rip, char **fn_name, char **file_name, size_t *offset) {
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*fn_name = "??";
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*file_name = "??";
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*offset = 0;
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if ((uint64_t)rip < LOAD_BASE)
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return;
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uint64_t rip_offset = (uint64_t)rip - LOAD_BASE;
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size_t low = 0;
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size_t high = (dbg_sym_table_end - dbg_sym_table) / SYM_TABLE_ENTRY_SIZE;
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while (low < high) {
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size_t mid = low + (high - low) / 2;
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if (dbg_sym_table[mid * SYM_TABLE_ENTRY_SIZE] <= rip_offset)
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low = mid + 1;
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else
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high = mid;
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}
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if (low == 0)
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return;
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uint32_t *symbol = dbg_sym_table + (low - 1) * SYM_TABLE_ENTRY_SIZE;
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*fn_name = dbg_fn_name_table + symbol[1];
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*file_name = dbg_file_name_table + symbol[2];
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*offset = rip_offset - symbol[0];
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}
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