Luna/kernel/src/trace/Resolve.cpp

#include "trace/Resolve.h"
#include "init/InitRD.h"
#include "std/stdlib.h"
#include "std/string.h"
#include <stddef.h>

extern int kernel_start;
extern int kernel_end;

static InitRD::File symbol_map = {"", 0, 0, (void*)-1};

static size_t symbol_strlen(const char* symbol)
{
    const char* i = symbol;
    for (; *i != '\n' && *i; ++i)
        ;
    return (i - symbol);
}

void get_symbol_name(uintptr_t address, char* buffer)
{
    if (symbol_map.addr == (void*)-1) { symbol_map = InitRD::open("sys/moon.sym"); }
    if (!symbol_map.addr) { strncpy(buffer, "(no symbols loaded)", 20); }
    while (address >= (uintptr_t)&kernel_start && address <= (uintptr_t)&kernel_end)
    {
        char addr_as_str[60];
        ultoa(address, addr_as_str, 16);
        char* symbol = strstr((char*)symbol_map.addr, addr_as_str);
        if (symbol)
        {
            symbol += 19;
            size_t symlen = symbol_strlen(symbol);
            memcpy(buffer, symbol, symlen);
            buffer[symlen] = 0;
            return;
        }
        address--;
    }
    strncpy(buffer, "(no symbol)", 12);
}