1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 1998-2004 Hewlett-Packard Co 4 * David Mosberger-Tang <davidm@hpl.hp.com> 5 * Stephane Eranian <eranian@hpl.hp.com> 6 * Copyright (C) 2003 Intel Co 7 * Suresh Siddha <suresh.b.siddha@intel.com> 8 * Fenghua Yu <fenghua.yu@intel.com> 9 * Arun Sharma <arun.sharma@intel.com> 10 * 11 * 12/07/98 S. Eranian added pt_regs & switch_stack 12 * 12/21/98 D. Mosberger updated to match latest code 13 * 6/17/99 D. Mosberger added second unat member to "struct switch_stack" 14 * 15 */ 16 #ifndef _ASM_IA64_PTRACE_H 17 #define _ASM_IA64_PTRACE_H 18 19 #ifndef ASM_OFFSETS_C 20 #include <asm/asm-offsets.h> 21 #endif 22 #include <uapi/asm/ptrace.h> 23 24 /* 25 * Base-2 logarithm of number of pages to allocate per task structure 26 * (including register backing store and memory stack): 27 */ 28 #if defined(CONFIG_IA64_PAGE_SIZE_4KB) 29 # define KERNEL_STACK_SIZE_ORDER 3 30 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB) 31 # define KERNEL_STACK_SIZE_ORDER 2 32 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB) 33 # define KERNEL_STACK_SIZE_ORDER 1 34 #else 35 # define KERNEL_STACK_SIZE_ORDER 0 36 #endif 37 38 #define IA64_RBS_OFFSET ((IA64_TASK_SIZE + IA64_THREAD_INFO_SIZE + 31) & ~31) 39 #define IA64_STK_OFFSET ((1 << KERNEL_STACK_SIZE_ORDER)*PAGE_SIZE) 40 41 #define KERNEL_STACK_SIZE IA64_STK_OFFSET 42 43 #ifndef __ASSEMBLY__ 44 45 #include <asm/current.h> 46 #include <asm/page.h> 47 48 /* 49 * We use the ia64_psr(regs)->ri to determine which of the three 50 * instructions in bundle (16 bytes) took the sample. Generate 51 * the canonical representation by adding to instruction pointer. 52 */ 53 # define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri) 54 # define instruction_pointer_set(regs, val) \ 55 ({ \ 56 ia64_psr(regs)->ri = (val & 0xf); \ 57 regs->cr_iip = (val & ~0xfULL); \ 58 }) 59 60 static inline unsigned long user_stack_pointer(struct pt_regs *regs) 61 { 62 return regs->r12; 63 } 64 65 static inline int is_syscall_success(struct pt_regs *regs) 66 { 67 return regs->r10 != -1; 68 } 69 70 static inline long regs_return_value(struct pt_regs *regs) 71 { 72 if (is_syscall_success(regs)) 73 return regs->r8; 74 else 75 return -regs->r8; 76 } 77 78 /* Conserve space in histogram by encoding slot bits in address 79 * bits 2 and 3 rather than bits 0 and 1. 80 */ 81 #define profile_pc(regs) \ 82 ({ \ 83 unsigned long __ip = instruction_pointer(regs); \ 84 (__ip & ~3UL) + ((__ip & 3UL) << 2); \ 85 }) 86 87 /* given a pointer to a task_struct, return the user's pt_regs */ 88 # define task_pt_regs(t) (((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1) 89 # define ia64_psr(regs) ((struct ia64_psr *) &(regs)->cr_ipsr) 90 # define user_mode(regs) (((struct ia64_psr *) &(regs)->cr_ipsr)->cpl != 0) 91 # define user_stack(task,regs) ((long) regs - (long) task == IA64_STK_OFFSET - sizeof(*regs)) 92 # define fsys_mode(task,regs) \ 93 ({ \ 94 struct task_struct *_task = (task); \ 95 struct pt_regs *_regs = (regs); \ 96 !user_mode(_regs) && user_stack(_task, _regs); \ 97 }) 98 99 /* 100 * System call handlers that, upon successful completion, need to return a negative value 101 * should call force_successful_syscall_return() right before returning. On architectures 102 * where the syscall convention provides for a separate error flag (e.g., alpha, ia64, 103 * ppc{,64}, sparc{,64}, possibly others), this macro can be used to ensure that the error 104 * flag will not get set. On architectures which do not support a separate error flag, 105 * the macro is a no-op and the spurious error condition needs to be filtered out by some 106 * other means (e.g., in user-level, by passing an extra argument to the syscall handler, 107 * or something along those lines). 108 * 109 * On ia64, we can clear the user's pt_regs->r8 to force a successful syscall. 110 */ 111 # define force_successful_syscall_return() (task_pt_regs(current)->r8 = 0) 112 113 struct task_struct; /* forward decl */ 114 struct unw_frame_info; /* forward decl */ 115 116 extern unsigned long ia64_get_user_rbs_end (struct task_struct *, struct pt_regs *, 117 unsigned long *); 118 extern long ia64_peek (struct task_struct *, struct switch_stack *, unsigned long, 119 unsigned long, long *); 120 extern long ia64_poke (struct task_struct *, struct switch_stack *, unsigned long, 121 unsigned long, long); 122 extern void ia64_flush_fph (struct task_struct *); 123 extern void ia64_sync_fph (struct task_struct *); 124 extern void ia64_sync_krbs(void); 125 extern long ia64_sync_user_rbs (struct task_struct *, struct switch_stack *, 126 unsigned long, unsigned long); 127 128 /* get nat bits for scratch registers such that bit N==1 iff scratch register rN is a NaT */ 129 extern unsigned long ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat); 130 /* put nat bits for scratch registers such that scratch register rN is a NaT iff bit N==1 */ 131 extern unsigned long ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat); 132 133 extern void ia64_increment_ip (struct pt_regs *pt); 134 extern void ia64_decrement_ip (struct pt_regs *pt); 135 136 extern void ia64_ptrace_stop(void); 137 #define arch_ptrace_stop() \ 138 ia64_ptrace_stop() 139 #define arch_ptrace_stop_needed() \ 140 (!test_thread_flag(TIF_RESTORE_RSE)) 141 142 #define arch_has_single_step() (1) 143 #define arch_has_block_step() (1) 144 145 #endif /* !__ASSEMBLY__ */ 146 #endif /* _ASM_IA64_PTRACE_H */ 147