1 files changed, 77 insertions, 0 deletions
diff --git a/libsframe/sframe-backtrace-regs.h b/libsframe/sframe-backtrace-regs.h
new file mode 100644
index 0000000..1932869
--- /dev/null
+++ b/libsframe/sframe-backtrace-regs.h
@@ -0,0 +1,77 @@
+/* The SFrame backtracer - accessing target registers.
+
+   Copyright (C) 2022 Free Software Foundation, Inc.
+
+   This file is part of libsframebt.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <stdint.h>
+#include <ucontext.h>
+
+#if defined (__x86_64__)
+
+static inline uint64_t
+get_context_pc (ucontext_t *cp)
+{
+  return cp->uc_mcontext.gregs[REG_RIP];
+}
+
+static inline uint64_t
+get_context_rsp (ucontext_t *cp)
+{
+  return cp->uc_mcontext.gregs[REG_RSP];
+}
+
+static inline uint64_t
+get_context_rfp (ucontext_t *cp)
+{
+  return cp->uc_mcontext.gregs[REG_RBP];
+}
+
+static inline uint64_t
+get_context_ra (ucontext_t *cp)
+{
+  return 0;	/* SFRAME_CFA_FIXED_RA_INVALID  */
+}
+
+#elif defined (__aarch64__)
+
+static inline uint64_t
+get_context_pc (ucontext_t *cp)
+{
+  return cp->uc_mcontext.pc;
+}
+
+static inline uint64_t
+get_context_rsp (ucontext_t *cp)
+{
+  return cp->uc_mcontext.sp;
+}
+
+static inline uint64_t
+get_context_rfp (ucontext_t *cp)
+{
+#define UNWIND_AARCH64_X29              29      /* 64-bit frame pointer.  */
+  return cp->uc_mcontext.regs[UNWIND_AARCH64_X29];
+}
+
+static inline uint64_t
+get_context_ra (ucontext_t *cp)
+{
+#define UNWIND_AARCH64_X30              30      /* 64-bit link pointer.  */
+  return cp->uc_mcontext.regs[UNWIND_AARCH64_X30];
+}
+
+#endif