1#ifndef _ASM_IA64_PTRACE_H 2#define _ASM_IA64_PTRACE_H 3 4/* 5 * Copyright (C) 1998-2004 Hewlett-Packard Co 6 * David Mosberger-Tang <davidm@hpl.hp.com> 7 * Stephane Eranian <eranian@hpl.hp.com> 8 * Copyright (C) 2003 Intel Co 9 * Suresh Siddha <suresh.b.siddha@intel.com> 10 * Fenghua Yu <fenghua.yu@intel.com> 11 * Arun Sharma <arun.sharma@intel.com> 12 * 13 * 12/07/98 S. Eranian added pt_regs & switch_stack 14 * 12/21/98 D. Mosberger updated to match latest code 15 * 6/17/99 D. Mosberger added second unat member to "struct switch_stack" 16 * 17 */ 18/* 19 * When a user process is blocked, its state looks as follows: 20 * 21 * +----------------------+ ------- IA64_STK_OFFSET 22 * | | ^ 23 * | struct pt_regs | | 24 * | | | 25 * +----------------------+ | 26 * | | | 27 * | memory stack | | 28 * | (growing downwards) | | 29 * //.....................// | 30 * | 31 * //.....................// | 32 * | | | 33 * +----------------------+ | 34 * | struct switch_stack | | 35 * | | | 36 * +----------------------+ | 37 * | | | 38 * //.....................// | 39 * | 40 * //.....................// | 41 * | | | 42 * | register stack | | 43 * | (growing upwards) | | 44 * | | | 45 * +----------------------+ | --- IA64_RBS_OFFSET 46 * | struct thread_info | | ^ 47 * +----------------------+ | | 48 * | | | | 49 * | struct task_struct | | | 50 * current -> | | | | 51 * +----------------------+ ------- 52 * 53 * Note that ar.ec is not saved explicitly in pt_reg or switch_stack. 54 * This is because ar.ec is saved as part of ar.pfs. 55 */ 56 57 58#include <asm/fpu.h> 59 60#ifdef __KERNEL__ 61#ifndef ASM_OFFSETS_C 62#include <asm/asm-offsets.h> 63#endif 64 65/* 66 * Base-2 logarithm of number of pages to allocate per task structure 67 * (including register backing store and memory stack): 68 */ 69#if defined(CONFIG_IA64_PAGE_SIZE_4KB) 70# define KERNEL_STACK_SIZE_ORDER 3 71#elif defined(CONFIG_IA64_PAGE_SIZE_8KB) 72# define KERNEL_STACK_SIZE_ORDER 2 73#elif defined(CONFIG_IA64_PAGE_SIZE_16KB) 74# define KERNEL_STACK_SIZE_ORDER 1 75#else 76# define KERNEL_STACK_SIZE_ORDER 0 77#endif 78 79#define IA64_RBS_OFFSET ((IA64_TASK_SIZE + IA64_THREAD_INFO_SIZE + 31) & ~31) 80#define IA64_STK_OFFSET ((1 << KERNEL_STACK_SIZE_ORDER)*PAGE_SIZE) 81 82#define KERNEL_STACK_SIZE IA64_STK_OFFSET 83 84#endif /* __KERNEL__ */ 85 86#ifndef __ASSEMBLY__ 87 88/* 89 * This struct defines the way the registers are saved on system 90 * calls. 91 * 92 * We don't save all floating point register because the kernel 93 * is compiled to use only a very small subset, so the other are 94 * untouched. 95 * 96 * THIS STRUCTURE MUST BE A MULTIPLE 16-BYTE IN SIZE 97 * (because the memory stack pointer MUST ALWAYS be aligned this way) 98 * 99 */ 100struct pt_regs { 101 /* The following registers are saved by SAVE_MIN: */ 102 unsigned long b6; /* scratch */ 103 unsigned long b7; /* scratch */ 104 105 unsigned long ar_csd; /* used by cmp8xchg16 (scratch) */ 106 unsigned long ar_ssd; /* reserved for future use (scratch) */ 107 108 unsigned long r8; /* scratch (return value register 0) */ 109 unsigned long r9; /* scratch (return value register 1) */ 110 unsigned long r10; /* scratch (return value register 2) */ 111 unsigned long r11; /* scratch (return value register 3) */ 112 113 unsigned long cr_ipsr; /* interrupted task's psr */ 114 unsigned long cr_iip; /* interrupted task's instruction pointer */ 115 /* 116 * interrupted task's function state; if bit 63 is cleared, it 117 * contains syscall's ar.pfs.pfm: 118 */ 119 unsigned long cr_ifs; 120 121 unsigned long ar_unat; /* interrupted task's NaT register (preserved) */ 122 unsigned long ar_pfs; /* prev function state */ 123 unsigned long ar_rsc; /* RSE configuration */ 124 /* The following two are valid only if cr_ipsr.cpl > 0 || ti->flags & _TIF_MCA_INIT */ 125 unsigned long ar_rnat; /* RSE NaT */ 126 unsigned long ar_bspstore; /* RSE bspstore */ 127 128 unsigned long pr; /* 64 predicate registers (1 bit each) */ 129 unsigned long b0; /* return pointer (bp) */ 130 unsigned long loadrs; /* size of dirty partition << 16 */ 131 132 unsigned long r1; /* the gp pointer */ 133 unsigned long r12; /* interrupted task's memory stack pointer */ 134 unsigned long r13; /* thread pointer */ 135 136 unsigned long ar_fpsr; /* floating point status (preserved) */ 137 unsigned long r15; /* scratch */ 138 139 /* The remaining registers are NOT saved for system calls. */ 140 141 unsigned long r14; /* scratch */ 142 unsigned long r2; /* scratch */ 143 unsigned long r3; /* scratch */ 144 145 /* The following registers are saved by SAVE_REST: */ 146 unsigned long r16; /* scratch */ 147 unsigned long r17; /* scratch */ 148 unsigned long r18; /* scratch */ 149 unsigned long r19; /* scratch */ 150 unsigned long r20; /* scratch */ 151 unsigned long r21; /* scratch */ 152 unsigned long r22; /* scratch */ 153 unsigned long r23; /* scratch */ 154 unsigned long r24; /* scratch */ 155 unsigned long r25; /* scratch */ 156 unsigned long r26; /* scratch */ 157 unsigned long r27; /* scratch */ 158 unsigned long r28; /* scratch */ 159 unsigned long r29; /* scratch */ 160 unsigned long r30; /* scratch */ 161 unsigned long r31; /* scratch */ 162 163 unsigned long ar_ccv; /* compare/exchange value (scratch) */ 164 165 /* 166 * Floating point registers that the kernel considers scratch: 167 */ 168 struct ia64_fpreg f6; /* scratch */ 169 struct ia64_fpreg f7; /* scratch */ 170 struct ia64_fpreg f8; /* scratch */ 171 struct ia64_fpreg f9; /* scratch */ 172 struct ia64_fpreg f10; /* scratch */ 173 struct ia64_fpreg f11; /* scratch */ 174}; 175 176/* 177 * This structure contains the addition registers that need to 178 * preserved across a context switch. This generally consists of 179 * "preserved" registers. 180 */ 181struct switch_stack { 182 unsigned long caller_unat; /* user NaT collection register (preserved) */ 183 unsigned long ar_fpsr; /* floating-point status register */ 184 185 struct ia64_fpreg f2; /* preserved */ 186 struct ia64_fpreg f3; /* preserved */ 187 struct ia64_fpreg f4; /* preserved */ 188 struct ia64_fpreg f5; /* preserved */ 189 190 struct ia64_fpreg f12; /* scratch, but untouched by kernel */ 191 struct ia64_fpreg f13; /* scratch, but untouched by kernel */ 192 struct ia64_fpreg f14; /* scratch, but untouched by kernel */ 193 struct ia64_fpreg f15; /* scratch, but untouched by kernel */ 194 struct ia64_fpreg f16; /* preserved */ 195 struct ia64_fpreg f17; /* preserved */ 196 struct ia64_fpreg f18; /* preserved */ 197 struct ia64_fpreg f19; /* preserved */ 198 struct ia64_fpreg f20; /* preserved */ 199 struct ia64_fpreg f21; /* preserved */ 200 struct ia64_fpreg f22; /* preserved */ 201 struct ia64_fpreg f23; /* preserved */ 202 struct ia64_fpreg f24; /* preserved */ 203 struct ia64_fpreg f25; /* preserved */ 204 struct ia64_fpreg f26; /* preserved */ 205 struct ia64_fpreg f27; /* preserved */ 206 struct ia64_fpreg f28; /* preserved */ 207 struct ia64_fpreg f29; /* preserved */ 208 struct ia64_fpreg f30; /* preserved */ 209 struct ia64_fpreg f31; /* preserved */ 210 211 unsigned long r4; /* preserved */ 212 unsigned long r5; /* preserved */ 213 unsigned long r6; /* preserved */ 214 unsigned long r7; /* preserved */ 215 216 unsigned long b0; /* so we can force a direct return in copy_thread */ 217 unsigned long b1; 218 unsigned long b2; 219 unsigned long b3; 220 unsigned long b4; 221 unsigned long b5; 222 223 unsigned long ar_pfs; /* previous function state */ 224 unsigned long ar_lc; /* loop counter (preserved) */ 225 unsigned long ar_unat; /* NaT bits for r4-r7 */ 226 unsigned long ar_rnat; /* RSE NaT collection register */ 227 unsigned long ar_bspstore; /* RSE dirty base (preserved) */ 228 unsigned long pr; /* 64 predicate registers (1 bit each) */ 229}; 230 231#ifdef __KERNEL__ 232 233#include <asm/current.h> 234#include <asm/page.h> 235 236/* 237 * We use the ia64_psr(regs)->ri to determine which of the three 238 * instructions in bundle (16 bytes) took the sample. Generate 239 * the canonical representation by adding to instruction pointer. 240 */ 241# define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri) 242 243static inline unsigned long user_stack_pointer(struct pt_regs *regs) 244{ 245 /* FIXME: should this be bspstore + nr_dirty regs? */ 246 return regs->ar_bspstore; 247} 248 249static inline int is_syscall_success(struct pt_regs *regs) 250{ 251 return regs->r10 != -1; 252} 253 254static inline long regs_return_value(struct pt_regs *regs) 255{ 256 if (is_syscall_success(regs)) 257 return regs->r8; 258 else 259 return -regs->r8; 260} 261 262/* Conserve space in histogram by encoding slot bits in address 263 * bits 2 and 3 rather than bits 0 and 1. 264 */ 265#define profile_pc(regs) \ 266({ \ 267 unsigned long __ip = instruction_pointer(regs); \ 268 (__ip & ~3UL) + ((__ip & 3UL) << 2); \ 269}) 270 271 /* given a pointer to a task_struct, return the user's pt_regs */ 272# define task_pt_regs(t) (((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1) 273# define ia64_psr(regs) ((struct ia64_psr *) &(regs)->cr_ipsr) 274# define user_mode(regs) (((struct ia64_psr *) &(regs)->cr_ipsr)->cpl != 0) 275# define user_stack(task,regs) ((long) regs - (long) task == IA64_STK_OFFSET - sizeof(*regs)) 276# define fsys_mode(task,regs) \ 277 ({ \ 278 struct task_struct *_task = (task); \ 279 struct pt_regs *_regs = (regs); \ 280 !user_mode(_regs) && user_stack(_task, _regs); \ 281 }) 282 283 /* 284 * System call handlers that, upon successful completion, need to return a negative value 285 * should call force_successful_syscall_return() right before returning. On architectures 286 * where the syscall convention provides for a separate error flag (e.g., alpha, ia64, 287 * ppc{,64}, sparc{,64}, possibly others), this macro can be used to ensure that the error 288 * flag will not get set. On architectures which do not support a separate error flag, 289 * the macro is a no-op and the spurious error condition needs to be filtered out by some 290 * other means (e.g., in user-level, by passing an extra argument to the syscall handler, 291 * or something along those lines). 292 * 293 * On ia64, we can clear the user's pt_regs->r8 to force a successful syscall. 294 */ 295# define force_successful_syscall_return() (task_pt_regs(current)->r8 = 0) 296 297 struct task_struct; /* forward decl */ 298 struct unw_frame_info; /* forward decl */ 299 300 extern void ia64_do_show_stack (struct unw_frame_info *, void *); 301 extern unsigned long ia64_get_user_rbs_end (struct task_struct *, struct pt_regs *, 302 unsigned long *); 303 extern long ia64_peek (struct task_struct *, struct switch_stack *, unsigned long, 304 unsigned long, long *); 305 extern long ia64_poke (struct task_struct *, struct switch_stack *, unsigned long, 306 unsigned long, long); 307 extern void ia64_flush_fph (struct task_struct *); 308 extern void ia64_sync_fph (struct task_struct *); 309 extern void ia64_sync_krbs(void); 310 extern long ia64_sync_user_rbs (struct task_struct *, struct switch_stack *, 311 unsigned long, unsigned long); 312 313 /* get nat bits for scratch registers such that bit N==1 iff scratch register rN is a NaT */ 314 extern unsigned long ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat); 315 /* put nat bits for scratch registers such that scratch register rN is a NaT iff bit N==1 */ 316 extern unsigned long ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat); 317 318 extern void ia64_increment_ip (struct pt_regs *pt); 319 extern void ia64_decrement_ip (struct pt_regs *pt); 320 321 extern void ia64_ptrace_stop(void); 322 #define arch_ptrace_stop(code, info) \ 323 ia64_ptrace_stop() 324 #define arch_ptrace_stop_needed(code, info) \ 325 (!test_thread_flag(TIF_RESTORE_RSE)) 326 327 extern void ptrace_attach_sync_user_rbs (struct task_struct *); 328 #define arch_ptrace_attach(child) \ 329 ptrace_attach_sync_user_rbs(child) 330 331 #define arch_has_single_step() (1) 332 #define arch_has_block_step() (1) 333 334#endif /* !__KERNEL__ */ 335 336/* pt_all_user_regs is used for PTRACE_GETREGS PTRACE_SETREGS */ 337struct pt_all_user_regs { 338 unsigned long nat; 339 unsigned long cr_iip; 340 unsigned long cfm; 341 unsigned long cr_ipsr; 342 unsigned long pr; 343 344 unsigned long gr[32]; 345 unsigned long br[8]; 346 unsigned long ar[128]; 347 struct ia64_fpreg fr[128]; 348}; 349 350#endif /* !__ASSEMBLY__ */ 351 352/* indices to application-registers array in pt_all_user_regs */ 353#define PT_AUR_RSC 16 354#define PT_AUR_BSP 17 355#define PT_AUR_BSPSTORE 18 356#define PT_AUR_RNAT 19 357#define PT_AUR_CCV 32 358#define PT_AUR_UNAT 36 359#define PT_AUR_FPSR 40 360#define PT_AUR_PFS 64 361#define PT_AUR_LC 65 362#define PT_AUR_EC 66 363 364/* 365 * The numbers chosen here are somewhat arbitrary but absolutely MUST 366 * not overlap with any of the number assigned in <linux/ptrace.h>. 367 */ 368#define PTRACE_SINGLEBLOCK 12 /* resume execution until next branch */ 369#define PTRACE_OLD_GETSIGINFO 13 /* (replaced by PTRACE_GETSIGINFO in <linux/ptrace.h>) */ 370#define PTRACE_OLD_SETSIGINFO 14 /* (replaced by PTRACE_SETSIGINFO in <linux/ptrace.h>) */ 371#define PTRACE_GETREGS 18 /* get all registers (pt_all_user_regs) in one shot */ 372#define PTRACE_SETREGS 19 /* set all registers (pt_all_user_regs) in one shot */ 373 374#define PTRACE_OLDSETOPTIONS 21 375 376#endif /* _ASM_IA64_PTRACE_H */ 377