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/*
 * AArch64 KGDB support
 *
 * Based on arch/arm/include/kgdb.h
 *
 * Copyright (C) 2013 Cavium Inc.
 * Author: Vijaya Kumar K <vijaya.kumar@caviumnetworks.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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/>.
 */

#ifndef __ARM_KGDB_H
#define __ARM_KGDB_H

#include <linux/ptrace.h>
#include <asm/debug-monitors.h>

#ifndef	__ASSEMBLY__

static inline void arch_kgdb_breakpoint(void)
{
	asm ("brk %0" : : "I" (KGDB_COMPILED_DBG_BRK_IMM));
}

extern void kgdb_handle_bus_error(void);
extern int kgdb_fault_expected;

#endif /* !__ASSEMBLY__ */

/*
 * gdb remote procotol (well most versions of it) expects the following
 * register layout.
 *
 * General purpose regs:
 *     r0-r30: 64 bit
 *     sp,pc : 64 bit
 *     pstate  : 32 bit
 *     Total: 33 + 1
 * FPU regs:
 *     f0-f31: 128 bit
 *     fpsr & fpcr: 32 bit
 *     Total: 32 + 2
 *
 * To expand a little on the "most versions of it"... when the gdb remote
 * protocol for AArch64 was developed it depended on a statement in the
 * Architecture Reference Manual that claimed "SPSR_ELx is a 32-bit register".
 * and, as a result, allocated only 32-bits for the PSTATE in the remote
 * protocol. In fact this statement is still present in ARM DDI 0487A.i.
 *
 * Unfortunately "is a 32-bit register" has a very special meaning for
 * system registers. It means that "the upper bits, bits[63:32], are
 * RES0.". RES0 is heavily used in the ARM architecture documents as a
 * way to leave space for future architecture changes. So to translate a
 * little for people who don't spend their spare time reading ARM architecture
 * manuals, what "is a 32-bit register" actually means in this context is
 * "is a 64-bit register but one with no meaning allocated to any of the
 * upper 32-bits... *yet*".
 *
 * Perhaps then we should not be surprised that this has led to some
 * confusion. Specifically a patch, influenced by the above translation,
 * that extended PSTATE to 64-bit was accepted into gdb-7.7 but the patch
 * was reverted in gdb-7.8.1 and all later releases, when this was
 * discovered to be an undocumented protocol change.
 *
 * So... it is *not* wrong for us to only allocate 32-bits to PSTATE
 * here even though the kernel itself allocates 64-bits for the same
 * state. That is because this bit of code tells the kernel how the gdb
 * remote protocol (well most versions of it) describes the register state.
 *
 * Note that if you are using one of the versions of gdb that supports
 * the gdb-7.7 version of the protocol you cannot use kgdb directly
 * without providing a custom register description (gdb can load new
 * protocol descriptions at runtime).
 */

#define _GP_REGS		33
#define _FP_REGS		32
#define _EXTRA_REGS		3
/*
 * general purpose registers size in bytes.
 * pstate is only 4 bytes. subtract 4 bytes
 */
#define GP_REG_BYTES		(_GP_REGS * 8)
#define DBG_MAX_REG_NUM		(_GP_REGS + _FP_REGS + _EXTRA_REGS)

/*
 * Size of I/O buffer for gdb packet.
 * considering to hold all register contents, size is set
 */

#define BUFMAX			2048

/*
 * Number of bytes required for gdb_regs buffer.
 * _GP_REGS: 8 bytes, _FP_REGS: 16 bytes and _EXTRA_REGS: 4 bytes each
 * GDB fails to connect for size beyond this with error
 * "'g' packet reply is too long"
 */

#define NUMREGBYTES	((_GP_REGS * 8) + (_FP_REGS * 16) + \
			(_EXTRA_REGS * 4))

#endif /* __ASM_KGDB_H */

Filemanager

Name Type Size Permission Actions
xen Folder 0755
Kbuild File 703 B 0644
acenv.h File 541 B 0644
acpi.h File 4.34 KB 0644
alternative.h File 7.63 KB 0644
arch_gicv3.h File 3.44 KB 0644
arch_timer.h File 4.87 KB 0644
arm-cci.h File 794 B 0644
asm-bug.h File 1.45 KB 0644
asm-offsets.h File 35 B 0644
asm-uaccess.h File 2.09 KB 0644
assembler.h File 13.51 KB 0644
atomic.h File 8.35 KB 0644
atomic_ll_sc.h File 10.61 KB 0644
atomic_lse.h File 14.82 KB 0644
barrier.h File 3.78 KB 0644
bitops.h File 1.9 KB 0644
bitrev.h File 452 B 0644
boot.h File 384 B 0644
brk-imm.h File 706 B 0644
bug.h File 1.09 KB 0644
cache.h File 2.23 KB 0644
cacheflush.h File 4.87 KB 0644
checksum.h File 1.35 KB 0644
clocksource.h File 192 B 0644
cmpxchg.h File 7.98 KB 0644
compat.h File 7.15 KB 0644
compiler.h File 1.18 KB 0644
cpu.h File 1.84 KB 0644
cpu_ops.h File 2.73 KB 0644
cpucaps.h File 1.87 KB 0644
cpufeature.h File 19.14 KB 0644
cpuidle.h File 401 B 0644
cputype.h File 8.1 KB 0644
current.h File 517 B 0644
daifflags.h File 1.59 KB 0644
dcc.h File 1.36 KB 0644
debug-monitors.h File 3.76 KB 0644
device.h File 886 B 0644
dma-mapping.h File 2.42 KB 0644
dmi.h File 850 B 0644
efi.h File 4.57 KB 0644
elf.h File 5.7 KB 0644
esr.h File 9.02 KB 0644
exception.h File 1.21 KB 0644
exec.h File 868 B 0644
extable.h File 815 B 0644
fb.h File 1000 B 0644
fixmap.h File 2.91 KB 0644
fpsimd.h File 4.21 KB 0644
fpsimdmacros.h File 5.62 KB 0644
ftrace.h File 1.92 KB 0644
futex.h File 3.41 KB 0644
hardirq.h File 2.08 KB 0644
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jump_label.h File 1.68 KB 0644
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kernel-pgtable.h File 4.03 KB 0644
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kgdb.h File 3.79 KB 0644
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kvm_arm.h File 8.38 KB 0644
kvm_asm.h File 4.26 KB 0644
kvm_coproc.h File 2.04 KB 0644
kvm_emulate.h File 10.38 KB 0644
kvm_host.h File 15.73 KB 0644
kvm_hyp.h File 5.79 KB 0644
kvm_mmio.h File 1.3 KB 0644
kvm_mmu.h File 11.72 KB 0644
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lse.h File 1.26 KB 0644
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mmu.h File 2.76 KB 0644
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pci.h File 878 B 0644
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perf_event.h File 3.17 KB 0644
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pgtable-prot.h File 4.38 KB 0644
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probes.h File 1022 B 0644
proc-fns.h File 1.21 KB 0644
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ptrace.h File 9 KB 0644
sdei.h File 1.46 KB 0644
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sections.h File 1.46 KB 0644
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stacktrace.h File 2.53 KB 0644
stage2_pgtable-nopmd.h File 1.3 KB 0644
stage2_pgtable-nopud.h File 1.24 KB 0644
stage2_pgtable.h File 4.89 KB 0644
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string.h File 2.33 KB 0644
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tlb.h File 2.22 KB 0644
tlbflush.h File 5.38 KB 0644
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traps.h File 3.33 KB 0644
uaccess.h File 12.01 KB 0644
unistd.h File 1.6 KB 0644
unistd32.h File 27.53 KB 0644
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vdso.h File 1.09 KB 0644
vdso_datapage.h File 1.53 KB 0644
vectors.h File 1.75 KB 0644
virt.h File 3 KB 0644
vmap_stack.h File 769 B 0644
word-at-a-time.h File 2.22 KB 0644