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/* 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
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