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83 lines
3.1 KiB
C
83 lines
3.1 KiB
C
/* Common target dependent code for GNU/Linux on ARM systems.
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Copyright (C) 1999-2020 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef ARCH_ARM_LINUX_H
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#define ARCH_ARM_LINUX_H
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/* The index to access CSPR in user_regs defined in GLIBC. */
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#define ARM_CPSR_GREGNUM 16
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/* There are a couple of different possible stack layouts that
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we need to support.
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Before version 2.6.18, the kernel used completely independent
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layouts for non-RT and RT signals. For non-RT signals the stack
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began directly with a struct sigcontext. For RT signals the stack
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began with two redundant pointers (to the siginfo and ucontext),
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and then the siginfo and ucontext.
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As of version 2.6.18, the non-RT signal frame layout starts with
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a ucontext and the RT signal frame starts with a siginfo and then
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a ucontext. Also, the ucontext now has a designated save area
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for coprocessor registers.
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For RT signals, it's easy to tell the difference: we look for
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pinfo, the pointer to the siginfo. If it has the expected
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value, we have an old layout. If it doesn't, we have the new
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layout.
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For non-RT signals, it's a bit harder. We need something in one
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layout or the other with a recognizable offset and value. We can't
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use the return trampoline, because ARM usually uses SA_RESTORER,
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in which case the stack return trampoline is not filled in.
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We can't use the saved stack pointer, because sigaltstack might
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be in use. So for now we guess the new layout... */
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/* There are three words (trap_no, error_code, oldmask) in
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struct sigcontext before r0. */
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#define ARM_SIGCONTEXT_R0 0xc
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/* There are five words (uc_flags, uc_link, and three for uc_stack)
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in the ucontext_t before the sigcontext. */
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#define ARM_UCONTEXT_SIGCONTEXT 0x14
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/* There are three elements in an rt_sigframe before the ucontext:
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pinfo, puc, and info. The first two are pointers and the third
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is a struct siginfo, with size 128 bytes. We could follow puc
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to the ucontext, but it's simpler to skip the whole thing. */
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#define ARM_OLD_RT_SIGFRAME_SIGINFO 0x8
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#define ARM_OLD_RT_SIGFRAME_UCONTEXT 0x88
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#define ARM_NEW_RT_SIGFRAME_UCONTEXT 0x80
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#define ARM_NEW_SIGFRAME_MAGIC 0x5ac3c35a
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int
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arm_linux_sigreturn_next_pc_offset (unsigned long sp,
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unsigned long sp_data,
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unsigned long svc_number,
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int is_sigreturn);
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struct arm_get_next_pcs;
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CORE_ADDR arm_linux_get_next_pcs_fixup (struct arm_get_next_pcs *self,
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CORE_ADDR pc);
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#endif /* ARCH_ARM_LINUX_H */
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