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 55 static inline unsigned long user_stack_pointer(struct pt_regs *regs) 56 { 57 return regs->r12; 58 } 59 60 static inline int is_syscall_success(struct pt_regs *regs) 61 { 62 return regs->r10 != -1; 63 } 64 65 static inline long regs_return_value(struct pt_regs *regs) 66 { 67 if (is_syscall_success(regs)) 68 return regs->r8; 69 else 70 return -regs->r8; 71 } 72 73 /* Conserve space in histogram by encoding slot bits in address 74 * bits 2 and 3 rather than bits 0 and 1. 75 */ 76 #define profile_pc(regs) \ 77 ({ \ 78 unsigned long __ip = instruction_pointer(regs); \ 79 (__ip & ~3UL) + ((__ip & 3UL) << 2); \ 80 }) 81 82 /* given a pointer to a task_struct, return the user's pt_regs */ 83 # define task_pt_regs(t) (((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1) 84 # define ia64_psr(regs) ((struct ia64_psr *) &(regs)->cr_ipsr) 85 # define user_mode(regs) (((struct ia64_psr *) &(regs)->cr_ipsr)->cpl != 0) 86 # define user_stack(task,regs) ((long) regs - (long) task == IA64_STK_OFFSET - sizeof(*regs)) 87 # define fsys_mode(task,regs) \ 88 ({ \ 89 struct task_struct *_task = (task); \ 90 struct pt_regs *_regs = (regs); \ 91 !user_mode(_regs) && user_stack(_task, _regs); \ 92 }) 93 94 /* 95 * System call handlers that, upon successful completion, need to return a negative value 96 * should call force_successful_syscall_return() right before returning. On architectures 97 * where the syscall convention provides for a separate error flag (e.g., alpha, ia64, 98 * ppc{,64}, sparc{,64}, possibly others), this macro can be used to ensure that the error 99 * flag will not get set. On architectures which do not support a separate error flag, 100 * the macro is a no-op and the spurious error condition needs to be filtered out by some 101 * other means (e.g., in user-level, by passing an extra argument to the syscall handler, 102 * or something along those lines). 103 * 104 * On ia64, we can clear the user's pt_regs->r8 to force a successful syscall. 105 */ 106 # define force_successful_syscall_return() (task_pt_regs(current)->r8 = 0) 107 108 struct task_struct; /* forward decl */ 109 struct unw_frame_info; /* forward decl */ 110 111 extern unsigned long ia64_get_user_rbs_end (struct task_struct *, struct pt_regs *, 112 unsigned long *); 113 extern long ia64_peek (struct task_struct *, struct switch_stack *, unsigned long, 114 unsigned long, long *); 115 extern long ia64_poke (struct task_struct *, struct switch_stack *, unsigned long, 116 unsigned long, long); 117 extern void ia64_flush_fph (struct task_struct *); 118 extern void ia64_sync_fph (struct task_struct *); 119 extern void ia64_sync_krbs(void); 120 extern long ia64_sync_user_rbs (struct task_struct *, struct switch_stack *, 121 unsigned long, unsigned long); 122 123 /* get nat bits for scratch registers such that bit N==1 iff scratch register rN is a NaT */ 124 extern unsigned long ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat); 125 /* put nat bits for scratch registers such that scratch register rN is a NaT iff bit N==1 */ 126 extern unsigned long ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat); 127 128 extern void ia64_increment_ip (struct pt_regs *pt); 129 extern void ia64_decrement_ip (struct pt_regs *pt); 130 131 extern void ia64_ptrace_stop(void); 132 #define arch_ptrace_stop(code, info) \ 133 ia64_ptrace_stop() 134 #define arch_ptrace_stop_needed(code, info) \ 135 (!test_thread_flag(TIF_RESTORE_RSE)) 136 137 extern void ptrace_attach_sync_user_rbs (struct task_struct *); 138 #define arch_ptrace_attach(child) \ 139 ptrace_attach_sync_user_rbs(child) 140 141 #define arch_has_single_step() (1) 142 #define arch_has_block_step() (1) 143 144 #endif /* !__ASSEMBLY__ */ 145 #endif /* _ASM_IA64_PTRACE_H */ 146