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a9772285a7
commit d15155824c upstream.
linux/compiler.h is included indirectly by linux/types.h via
uapi/linux/types.h -> uapi/linux/posix_types.h -> linux/stddef.h
-> uapi/linux/stddef.h and is needed to provide a proper definition of
offsetof.
Unfortunately, compiler.h requires a definition of
smp_read_barrier_depends() for defining lockless_dereference() and soon
for defining READ_ONCE(), which means that all
users of READ_ONCE() will need to include asm/barrier.h to avoid splats
such as:
In file included from include/uapi/linux/stddef.h:1:0,
from include/linux/stddef.h:4,
from arch/h8300/kernel/asm-offsets.c:11:
include/linux/list.h: In function 'list_empty':
>> include/linux/compiler.h:343:2: error: implicit declaration of function 'smp_read_barrier_depends' [-Werror=implicit-function-declaration]
smp_read_barrier_depends(); /* Enforce dependency ordering from x */ \
^
A better alternative is to include asm/barrier.h in linux/compiler.h,
but this requires a type definition for "bool" on some architectures
(e.g. x86), which is defined later by linux/types.h. Type "bool" is also
used directly in linux/compiler.h, so the whole thing is pretty fragile.
This patch splits compiler.h in two: compiler_types.h contains type
annotations, definitions and the compiler-specific parts, whereas
compiler.h #includes compiler-types.h and additionally defines macros
such as {READ,WRITE.ACCESS}_ONCE().
uapi/linux/stddef.h and linux/linkage.h are then moved over to include
linux/compiler_types.h, which fixes the build for h8 and blackfin.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1508840570-22169-2-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
163 lines
4.2 KiB
C
163 lines
4.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __SPARC_PTRACE_H
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#define __SPARC_PTRACE_H
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#include <uapi/asm/ptrace.h>
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#if defined(__sparc__) && defined(__arch64__)
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#ifndef __ASSEMBLY__
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#include <linux/compiler.h>
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#include <linux/threads.h>
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#include <asm/switch_to.h>
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static inline int pt_regs_trap_type(struct pt_regs *regs)
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{
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return regs->magic & 0x1ff;
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}
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static inline bool pt_regs_is_syscall(struct pt_regs *regs)
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{
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return (regs->tstate & TSTATE_SYSCALL);
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}
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static inline bool pt_regs_clear_syscall(struct pt_regs *regs)
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{
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return (regs->tstate &= ~TSTATE_SYSCALL);
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}
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#define arch_ptrace_stop_needed(exit_code, info) \
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({ flush_user_windows(); \
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get_thread_wsaved() != 0; \
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})
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#define arch_ptrace_stop(exit_code, info) \
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synchronize_user_stack()
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#define current_pt_regs() \
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((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE) - 1)
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struct global_reg_snapshot {
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unsigned long tstate;
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unsigned long tpc;
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unsigned long tnpc;
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unsigned long o7;
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unsigned long i7;
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unsigned long rpc;
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struct thread_info *thread;
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unsigned long pad1;
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};
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struct global_pmu_snapshot {
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unsigned long pcr[4];
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unsigned long pic[4];
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};
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union global_cpu_snapshot {
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struct global_reg_snapshot reg;
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struct global_pmu_snapshot pmu;
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};
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extern union global_cpu_snapshot global_cpu_snapshot[NR_CPUS];
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#define force_successful_syscall_return() set_thread_noerror(1)
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#define user_mode(regs) (!((regs)->tstate & TSTATE_PRIV))
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#define instruction_pointer(regs) ((regs)->tpc)
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#define instruction_pointer_set(regs, val) do { \
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(regs)->tpc = (val); \
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(regs)->tnpc = (val)+4; \
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} while (0)
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#define user_stack_pointer(regs) ((regs)->u_regs[UREG_FP])
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static inline int is_syscall_success(struct pt_regs *regs)
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{
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return !(regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY));
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}
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static inline long regs_return_value(struct pt_regs *regs)
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{
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return regs->u_regs[UREG_I0];
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}
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#ifdef CONFIG_SMP
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unsigned long profile_pc(struct pt_regs *);
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#else
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#define profile_pc(regs) instruction_pointer(regs)
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#endif
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#define MAX_REG_OFFSET (offsetof(struct pt_regs, magic))
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int regs_query_register_offset(const char *name);
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unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n);
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/**
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* regs_get_register() - get register value from its offset
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* @regs: pt_regs from which register value is gotten
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* @offset: offset number of the register.
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*
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* regs_get_register returns the value of a register whose
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* offset from @regs. The @offset is the offset of the register
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* in struct pt_regs. If @offset is bigger than MAX_REG_OFFSET,
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* this returns 0.
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*/
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static inline unsigned long regs_get_register(struct pt_regs *regs,
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unsigned long offset)
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{
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if (unlikely(offset >= MAX_REG_OFFSET))
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return 0;
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if (offset == PT_V9_Y)
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return *(unsigned int *)((unsigned long)regs + offset);
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return *(unsigned long *)((unsigned long)regs + offset);
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}
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/* Valid only for Kernel mode traps. */
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static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
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{
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return regs->u_regs[UREG_I6];
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}
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#else /* __ASSEMBLY__ */
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#endif /* __ASSEMBLY__ */
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#else /* (defined(__sparc__) && defined(__arch64__)) */
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#ifndef __ASSEMBLY__
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#include <asm/switch_to.h>
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static inline bool pt_regs_is_syscall(struct pt_regs *regs)
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{
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return (regs->psr & PSR_SYSCALL);
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}
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static inline bool pt_regs_clear_syscall(struct pt_regs *regs)
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{
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return (regs->psr &= ~PSR_SYSCALL);
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}
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#define arch_ptrace_stop_needed(exit_code, info) \
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({ flush_user_windows(); \
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current_thread_info()->w_saved != 0; \
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})
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#define arch_ptrace_stop(exit_code, info) \
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synchronize_user_stack()
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#define current_pt_regs() \
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((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE) - 1)
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#define user_mode(regs) (!((regs)->psr & PSR_PS))
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#define instruction_pointer(regs) ((regs)->pc)
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#define user_stack_pointer(regs) ((regs)->u_regs[UREG_FP])
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unsigned long profile_pc(struct pt_regs *);
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#else /* (!__ASSEMBLY__) */
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#endif /* (!__ASSEMBLY__) */
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#endif /* (defined(__sparc__) && defined(__arch64__)) */
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#define STACK_BIAS 2047
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/* global_reg_snapshot offsets */
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#define GR_SNAP_TSTATE 0x00
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#define GR_SNAP_TPC 0x08
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#define GR_SNAP_TNPC 0x10
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#define GR_SNAP_O7 0x18
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#define GR_SNAP_I7 0x20
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#define GR_SNAP_RPC 0x28
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#define GR_SNAP_THREAD 0x30
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#define GR_SNAP_PAD1 0x38
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#endif /* !(__SPARC_PTRACE_H) */
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