1 /* 2 * Copyright (C) 1998-2004 Hewlett-Packard Co 3 * David Mosberger-Tang <davidm@hpl.hp.com> 4 * Stephane Eranian <eranian@hpl.hp.com> 5 * Copyright (C) 2003 Intel Co 6 * Suresh Siddha <suresh.b.siddha@intel.com> 7 * Fenghua Yu <fenghua.yu@intel.com> 8 * Arun Sharma <arun.sharma@intel.com> 9 * 10 * 12/07/98 S. Eranian added pt_regs & switch_stack 11 * 12/21/98 D. Mosberger updated to match latest code 12 * 6/17/99 D. Mosberger added second unat member to "struct switch_stack" 13 * 14 */ 15 #ifndef _ASM_IA64_PTRACE_H 16 #define _ASM_IA64_PTRACE_H 17 18 #ifndef ASM_OFFSETS_C 19 #include <asm/asm-offsets.h> 20 #endif 21 #include <uapi/asm/ptrace.h> 22 23 /* 24 * Base-2 logarithm of number of pages to allocate per task structure 25 * (including register backing store and memory stack): 26 */ 27 #if defined(CONFIG_IA64_PAGE_SIZE_4KB) 28 # define KERNEL_STACK_SIZE_ORDER 3 29 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB) 30 # define KERNEL_STACK_SIZE_ORDER 2 31 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB) 32 # define KERNEL_STACK_SIZE_ORDER 1 33 #else 34 # define KERNEL_STACK_SIZE_ORDER 0 35 #endif 36 37 #define IA64_RBS_OFFSET ((IA64_TASK_SIZE + IA64_THREAD_INFO_SIZE + 31) & ~31) 38 #define IA64_STK_OFFSET ((1 << KERNEL_STACK_SIZE_ORDER)*PAGE_SIZE) 39 40 #define KERNEL_STACK_SIZE IA64_STK_OFFSET 41 42 #ifndef __ASSEMBLY__ 43 44 #include <asm/current.h> 45 #include <asm/page.h> 46 47 /* 48 * We use the ia64_psr(regs)->ri to determine which of the three 49 * instructions in bundle (16 bytes) took the sample. Generate 50 * the canonical representation by adding to instruction pointer. 51 */ 52 # define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri) 53 54 static inline unsigned long user_stack_pointer(struct pt_regs *regs) 55 { 56 /* FIXME: should this be bspstore + nr_dirty regs? */ 57 return regs->ar_bspstore; 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 * Why not default? Because user_stack_pointer() on ia64 gives register 83 * stack backing store instead... 84 */ 85 #define current_user_stack_pointer() (current_pt_regs()->r12) 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 void ia64_do_show_stack (struct unw_frame_info *, void *); 117 extern unsigned long ia64_get_user_rbs_end (struct task_struct *, struct pt_regs *, 118 unsigned long *); 119 extern long ia64_peek (struct task_struct *, struct switch_stack *, unsigned long, 120 unsigned long, long *); 121 extern long ia64_poke (struct task_struct *, struct switch_stack *, unsigned long, 122 unsigned long, long); 123 extern void ia64_flush_fph (struct task_struct *); 124 extern void ia64_sync_fph (struct task_struct *); 125 extern void ia64_sync_krbs(void); 126 extern long ia64_sync_user_rbs (struct task_struct *, struct switch_stack *, 127 unsigned long, unsigned long); 128 129 /* get nat bits for scratch registers such that bit N==1 iff scratch register rN is a NaT */ 130 extern unsigned long ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat); 131 /* put nat bits for scratch registers such that scratch register rN is a NaT iff bit N==1 */ 132 extern unsigned long ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat); 133 134 extern void ia64_increment_ip (struct pt_regs *pt); 135 extern void ia64_decrement_ip (struct pt_regs *pt); 136 137 extern void ia64_ptrace_stop(void); 138 #define arch_ptrace_stop(code, info) \ 139 ia64_ptrace_stop() 140 #define arch_ptrace_stop_needed(code, info) \ 141 (!test_thread_flag(TIF_RESTORE_RSE)) 142 143 extern void ptrace_attach_sync_user_rbs (struct task_struct *); 144 #define arch_ptrace_attach(child) \ 145 ptrace_attach_sync_user_rbs(child) 146 147 #define arch_has_single_step() (1) 148 #define arch_has_block_step() (1) 149 150 #endif /* !__ASSEMBLY__ */ 151 #endif /* _ASM_IA64_PTRACE_H */ 152