[PATCH] backends: add ARM compatible mode to AARCH64
Jean Pihet
jean.pihet at linaro.org
Fri Mar 28 14:13:10 UTC 2014
Add the initial register setup for AARCH64 running ARM code (so
called the compat mode).
This makes 'eu-stack -p' happy on ARM binaries.
Based on the latest mjw/aarch64-unwind branch.
Signed-off-by: Jean Pihet <jean.pihet at linaro.org>
---
backends/arm_initreg.c | 34 ++++++++++++++++++++++++++++++++--
1 file changed, 32 insertions(+), 2 deletions(-)
diff --git a/backends/arm_initreg.c b/backends/arm_initreg.c
index c03146e..5837383 100644
--- a/backends/arm_initreg.c
+++ b/backends/arm_initreg.c
@@ -36,6 +36,12 @@
# include <sys/ptrace.h>
#endif
+#ifdef __aarch64__
+# include <linux/uio.h>
+# include <sys/user.h>
+# include <sys/ptrace.h>
+#endif
+
#define BACKEND arm_
#include "libebl_CPU.h"
@@ -44,15 +50,39 @@ arm_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
ebl_tid_registers_t *setfunc __attribute__ ((unused)),
void *arg __attribute__ ((unused)))
{
-#if ! defined __arm__
+#if !defined __arm__ && !defined __aarch64__
return false;
-#else
+#else /* __arm__ || __aarch64__ */
+#if defined __arm__
struct user_regs user_regs;
if (ptrace (PTRACE_GETREGS, tid, NULL, &user_regs) != 0)
return false;
+
Dwarf_Word dwarf_regs[16];
+ /* R0..R12 SP LR PC */
for (int i = 0; i < 16; i++)
dwarf_regs[i] = user_regs.uregs[i];
+
return setfunc (0, 16, dwarf_regs, arg);
+#elif defined __aarch64__
+ /* Compat mode: arm compatible code running on aarch64 */
+ int i;
+ struct user_pt_regs gregs;
+ struct iovec iovec;
+ iovec.iov_base = &gregs;
+ iovec.iov_len = sizeof (gregs);
+ if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec) != 0)
+ return false;
+
+ Dwarf_Word dwarf_regs[16];
+ /* R0..R12 SP LR PC, encoded as 32 bit quantities */
+ uint32_t *u32_ptr = (uint32_t *) &gregs.regs[0];
+ for (i = 0; i < 16; i++)
+ dwarf_regs[i] = u32_ptr[i];
+
+ return setfunc (0, 16, dwarf_regs, arg);
+#else
+# error "source file error, it cannot happen"
+#endif
#endif
}
--
1.7.11.7
More information about the elfutils-devel
mailing list