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authorRich Felker <dalias@aerifal.cx>2016-01-22 00:02:21 +0000
committerRich Felker <dalias@aerifal.cx>2016-01-22 00:02:21 +0000
commite617b9eea9d45b170eabadf5ca96ca0536c538be (patch)
treea06d433fd4219466e4b27f248e332f9e0482dd5d /src/ldso
parent397f0a6a7d798b0e3f636fe053cad9c483e011fb (diff)
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move arm-specific translation units out of arch/arm/src, to src/*/arm
this is possible with the new build system that allows src/*/$(ARCH)/* files which do not shadow a file in the parent directory, and yields a more logical organization. eventually it will be possible to remove arch/*/src from the build system.
Diffstat (limited to 'src/ldso')
-rw-r--r--src/ldso/arm/find_exidx.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/src/ldso/arm/find_exidx.c b/src/ldso/arm/find_exidx.c
new file mode 100644
index 00000000..77c4472b
--- /dev/null
+++ b/src/ldso/arm/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;
+}