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From f39afb9ffb34b747bfc1ec9d77b239c0c32a754d Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Wed, 10 Jul 2013 16:11:01 -0400
Subject: [PATCH 08/10] 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 <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;
+}
-- 
1.8.3.2