From f39afb9ffb34b747bfc1ec9d77b239c0c32a754d Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Wed, 10 Jul 2013 16:11:01 -0400 Subject: [PATCH 8/9] add some ARM EABI-specific exception handling infrastructure MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit patch by Timo Teräs --- arch/arm/src/find_exidx.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 arch/arm/src/find_exidx.c diff --git a/arch/arm/src/find_exidx.c b/arch/arm/src/find_exidx.c new file mode 100644 index 0000000..77c4472 --- /dev/null +++ b/arch/arm/src/find_exidx.c @@ -0,0 +1,42 @@ +#define _GNU_SOURCE +#include +#include + +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; +} -- 1.8.3.2