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Cross-architecture equivalent of rdusp(); default is user_stack_pointer(current_pt_regs()) - that works for almost all platforms that have usp saved in pt_regs. The only exception from that is ia64 - we want memory stack, not the backing store for register one. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
152 lines
5.4 KiB
C
152 lines
5.4 KiB
C
/*
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* Copyright (C) 1998-2004 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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* Stephane Eranian <eranian@hpl.hp.com>
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* Copyright (C) 2003 Intel Co
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* Suresh Siddha <suresh.b.siddha@intel.com>
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* Fenghua Yu <fenghua.yu@intel.com>
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* Arun Sharma <arun.sharma@intel.com>
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*
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* 12/07/98 S. Eranian added pt_regs & switch_stack
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* 12/21/98 D. Mosberger updated to match latest code
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* 6/17/99 D. Mosberger added second unat member to "struct switch_stack"
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*
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*/
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#ifndef _ASM_IA64_PTRACE_H
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#define _ASM_IA64_PTRACE_H
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#ifndef ASM_OFFSETS_C
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#include <asm/asm-offsets.h>
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#endif
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#include <uapi/asm/ptrace.h>
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/*
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* Base-2 logarithm of number of pages to allocate per task structure
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* (including register backing store and memory stack):
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*/
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#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
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# define KERNEL_STACK_SIZE_ORDER 3
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#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
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# define KERNEL_STACK_SIZE_ORDER 2
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#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
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# define KERNEL_STACK_SIZE_ORDER 1
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#else
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# define KERNEL_STACK_SIZE_ORDER 0
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#endif
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#define IA64_RBS_OFFSET ((IA64_TASK_SIZE + IA64_THREAD_INFO_SIZE + 31) & ~31)
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#define IA64_STK_OFFSET ((1 << KERNEL_STACK_SIZE_ORDER)*PAGE_SIZE)
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#define KERNEL_STACK_SIZE IA64_STK_OFFSET
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#ifndef __ASSEMBLY__
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#include <asm/current.h>
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#include <asm/page.h>
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/*
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* We use the ia64_psr(regs)->ri to determine which of the three
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* instructions in bundle (16 bytes) took the sample. Generate
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* the canonical representation by adding to instruction pointer.
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*/
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# define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri)
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static inline unsigned long user_stack_pointer(struct pt_regs *regs)
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{
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/* FIXME: should this be bspstore + nr_dirty regs? */
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return regs->ar_bspstore;
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}
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static inline int is_syscall_success(struct pt_regs *regs)
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{
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return regs->r10 != -1;
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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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if (is_syscall_success(regs))
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return regs->r8;
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else
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return -regs->r8;
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}
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/* Conserve space in histogram by encoding slot bits in address
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* bits 2 and 3 rather than bits 0 and 1.
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*/
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#define profile_pc(regs) \
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({ \
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unsigned long __ip = instruction_pointer(regs); \
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(__ip & ~3UL) + ((__ip & 3UL) << 2); \
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})
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/*
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* Why not default? Because user_stack_pointer() on ia64 gives register
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* stack backing store instead...
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*/
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#define current_user_stack_pointer() (current_pt_regs()->r12)
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/* given a pointer to a task_struct, return the user's pt_regs */
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# define task_pt_regs(t) (((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1)
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# define ia64_psr(regs) ((struct ia64_psr *) &(regs)->cr_ipsr)
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# define user_mode(regs) (((struct ia64_psr *) &(regs)->cr_ipsr)->cpl != 0)
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# define user_stack(task,regs) ((long) regs - (long) task == IA64_STK_OFFSET - sizeof(*regs))
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# define fsys_mode(task,regs) \
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({ \
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struct task_struct *_task = (task); \
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struct pt_regs *_regs = (regs); \
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!user_mode(_regs) && user_stack(_task, _regs); \
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})
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/*
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* System call handlers that, upon successful completion, need to return a negative value
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* should call force_successful_syscall_return() right before returning. On architectures
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* where the syscall convention provides for a separate error flag (e.g., alpha, ia64,
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* ppc{,64}, sparc{,64}, possibly others), this macro can be used to ensure that the error
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* flag will not get set. On architectures which do not support a separate error flag,
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* the macro is a no-op and the spurious error condition needs to be filtered out by some
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* other means (e.g., in user-level, by passing an extra argument to the syscall handler,
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* or something along those lines).
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*
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* On ia64, we can clear the user's pt_regs->r8 to force a successful syscall.
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*/
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# define force_successful_syscall_return() (task_pt_regs(current)->r8 = 0)
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struct task_struct; /* forward decl */
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struct unw_frame_info; /* forward decl */
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extern void ia64_do_show_stack (struct unw_frame_info *, void *);
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extern unsigned long ia64_get_user_rbs_end (struct task_struct *, struct pt_regs *,
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unsigned long *);
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extern long ia64_peek (struct task_struct *, struct switch_stack *, unsigned long,
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unsigned long, long *);
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extern long ia64_poke (struct task_struct *, struct switch_stack *, unsigned long,
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unsigned long, long);
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extern void ia64_flush_fph (struct task_struct *);
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extern void ia64_sync_fph (struct task_struct *);
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extern void ia64_sync_krbs(void);
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extern long ia64_sync_user_rbs (struct task_struct *, struct switch_stack *,
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unsigned long, unsigned long);
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/* get nat bits for scratch registers such that bit N==1 iff scratch register rN is a NaT */
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extern unsigned long ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat);
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/* put nat bits for scratch registers such that scratch register rN is a NaT iff bit N==1 */
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extern unsigned long ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat);
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extern void ia64_increment_ip (struct pt_regs *pt);
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extern void ia64_decrement_ip (struct pt_regs *pt);
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extern void ia64_ptrace_stop(void);
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#define arch_ptrace_stop(code, info) \
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ia64_ptrace_stop()
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#define arch_ptrace_stop_needed(code, info) \
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(!test_thread_flag(TIF_RESTORE_RSE))
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extern void ptrace_attach_sync_user_rbs (struct task_struct *);
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#define arch_ptrace_attach(child) \
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ptrace_attach_sync_user_rbs(child)
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#define arch_has_single_step() (1)
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#define arch_has_block_step() (1)
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_IA64_PTRACE_H */
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