source: asp3_tinet_ecnl_arm/trunk/musl-1.1.18/src/ldso/arm/find_exidx.c@ 352

#define _GNU_SOURCE
#include <link.h>
#include <stdint.h>

struct find_exidx_data {
        uintptr_t pc, exidx_start;
        int exidx_len;
};

static int find_exidx(struct dl_phdr_info *info, size_t size, void *ptr)
{
        struct find_exidx_data *data = ptr;
        const ElfW(Phdr) *phdr = info->dlpi_phdr;
        uintptr_t addr, exidx_start = 0;
        int i, match = 0, exidx_len = 0;

        for (i = info->dlpi_phnum; i > 0; i--, phdr++) {
                addr = info->dlpi_addr + phdr->p_vaddr;
                switch (phdr->p_type) {
                case PT_LOAD:
                        match |= data->pc >= addr && data->pc < addr + phdr->p_memsz;
                        break;
                case PT_ARM_EXIDX:
                        exidx_start = addr;
                        exidx_len = phdr->p_memsz;
                        break;
                }
        }
        data->exidx_start = exidx_start;
        data->exidx_len = exidx_len;
        return match;
}

uintptr_t __gnu_Unwind_Find_exidx(uintptr_t pc, int *pcount)
{
        struct find_exidx_data data;
        data.pc = pc;
        if (dl_iterate_phdr(find_exidx, &data) <= 0)
                return 0;
        *pcount = data.exidx_len / 8;
        return data.exidx_start;
}