95 lines
2.0 KiB
C
95 lines
2.0 KiB
C
/*
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* Helper functions for working with the builtin symbol table
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*
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* Copyright (c) 2008-2009 Analog Devices Inc.
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* Licensed under the GPL-2 or later.
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*/
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#include <common.h>
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#if (IS_ENABLED(CONFIG_KALLSYMS))
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#include <asm/sections.h>
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#include <asm/global_data.h>
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DECLARE_GLOBAL_DATA_PTR;
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#endif
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/* We need the weak marking as this symbol is provided specially */
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extern const char system_map[] __attribute__((weak));
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/* Given an address, return a pointer to the symbol name and store
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* the base address in caddr. So if the symbol map had an entry:
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* 03fb9b7c_spi_cs_deactivate
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* Then the following call:
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* unsigned long base;
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* const char *sym = symbol_lookup(0x03fb9b80, &base);
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* Would end up setting the variables like so:
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* base = 0x03fb9b7c;
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* sym = "_spi_cs_deactivate";
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*/
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#if (IS_ENABLED(CONFIG_KALLSYMS))
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const char *symbol_lookup(unsigned long addr, unsigned long *caddr, unsigned long *naddr)
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{
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const char *sym, *csym;
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unsigned long sym_addr;
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char sym_addr_tmp[17] = {0}; /* 17 bytes to avoid overflow */
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unsigned long text_start;
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unsigned long text_end;
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sym = system_map;
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csym = NULL;
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*caddr = 0;
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*naddr = 0;
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text_start = (ulong)&__image_copy_start - gd->reloc_off;
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text_end = (ulong)&__rodata_start - gd->reloc_off;
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/*
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* within text section?
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*/
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if (addr < text_start || addr > text_end)
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return NULL;
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while (*sym) {
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memcpy(sym_addr_tmp, sym, 16);
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sym_addr = simple_strtoul(sym_addr_tmp, NULL, 16);
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sym = sym + 16;
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if (sym_addr > addr) {
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*naddr = sym_addr;
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break;
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}
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*caddr = sym_addr;
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csym = sym;
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sym += strlen(sym) + 1;
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}
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/*
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* the last symbol?
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*/
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if (*sym == 0x00)
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*naddr = text_end;
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return csym;
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}
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#else
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const char *symbol_lookup(unsigned long addr, unsigned long *caddr)
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{
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const char *sym, *csym;
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char *esym;
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unsigned long sym_addr;
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sym = system_map;
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csym = NULL;
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*caddr = 0;
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while (*sym) {
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sym_addr = hextoul(sym, &esym);
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sym = esym;
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if (sym_addr > addr)
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break;
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*caddr = sym_addr;
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csym = sym;
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sym += strlen(sym) + 1;
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}
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return csym;
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}
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#endif
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