include/ust/processor.h

   1 #ifndef UST_PROCESSOR_H
   2 #define UST_PROCESSOR_H
   3
   4 #include <stddef.h>
   5 #include <string.h>
   6
   7 extern __thread long ust_reg_stack[500];
   8 extern volatile __thread long *ust_reg_stack_ptr;
   9
  10 #ifndef __x86_64
  11
  12 struct registers {
  13         short ss;
  14         short cs;
  15         long esi;
  16         long ebp;
  17         long edx;
  18         long edi;
  19         long ecx;
  20         long ebx;
  21         long eax;
  22         long eflags;
  23         long esp;
  24 };
  25
  26 #ifdef CONFIG_UST_GDB_INTEGRATION
  27
  28
  29 #define save_registers(regsptr) \
  30         asm volatile ( \
  31              /* save original esp */ \
  32              "pushl %%esp\n\t" \
  33              /* push original eflags */ \
  34              "pushfl\n\t" \
  35               /* eax will hold the ptr to the private stack bottom */ \
  36              "pushl %%eax\n\t" \
  37              /* ebx is used for TLS access */ \
  38              "pushl %%ebx\n\t" \
  39              /* ecx will be used to temporarily hold the stack bottom addr */ \
  40              "pushl %%ecx\n\t" \
  41              /* rdi is the input to __tls_get_addr, and also a temp var */ \
  42              "pushl %%edi\n\t" \
  43              /* Get GOT address */ \
  44              "call __i686.get_pc_thunk.bx\n\t" \
  45              "addl $_GLOBAL_OFFSET_TABLE_, %%ebx\n\t" \
  46              /* Save registers before call (not using ecx yet but we must preserve \
  47                 the original value of edx. */ \
  48              "pushl %%edx\n\t" \
  49              /* Start TLS access of private reg stack pointer */ \
  50              "leal ust_reg_stack_ptr@tlsgd(,%%ebx,1),%%eax\n\t" \
  51              "call ___tls_get_addr@plt\n\t" \
  52              /* --- End TLS access */ \
  53              "popl %%edx\n\t" \
  54              /* check if ust_reg_stack_ptr has been initialized */ \
  55              "movl (%%eax),%%ecx\n\t" \
  56              "testl %%ecx,%%ecx\n\t" \
  57              "jne 1f\n\t" \
  58              "movl %%eax,%%ecx\n\t" \
  59              /* Save registers before call (using ecx and we must preserve \
  60                 the original value of edx. */ \
  61              "pushl %%ecx\n\t" \
  62              "pushl %%edx\n\t" \
  63              /* Start TLS access of private reg stack */ \
  64              "leal ust_reg_stack@tlsgd(,%%ebx,1),%%eax\n\t" \
  65              "call ___tls_get_addr@plt\n\t" \
  66              /* --- End TLS access */ \
  67              "popl %%edx\n\t" \
  68              "popl %%ecx\n\t" \
  69              "addl $500,%%eax\n\t" \
  70              "movl %%eax,(%%ecx)\n\t" \
  71              "movl %%ecx,%%eax\n\t" \
  72              /* now the pointer to the private stack is in eax. \
  73                 must add stack size so the ptr points to the stack bottom. */ \
  74         "1:\n\t" \
  75              /* Manually push esp to private stack */ \
  76              "addl $-4,(%%eax)\n\t" \
  77              "movl 20(%%esp), %%edi\n\t" \
  78              "movl (%%eax), %%ebx\n\t" \
  79              "movl %%edi, (%%ebx)\n\t" \
  80              /* Manually push eflags to private stack */ \
  81              "addl $-4,(%%eax)\n\t" \
  82              "movl 16(%%esp), %%edi\n\t" \
  83              "movl (%%eax), %%ebx\n\t" \
  84              "movl %%edi, (%%ebx)\n\t" \
  85              /* Manually push eax to private stack */ \
  86              "addl $-4,(%%eax)\n\t" \
  87              "movl 12(%%esp), %%edi\n\t" \
  88              "movl (%%eax), %%ebx\n\t" \
  89              "movl %%edi, (%%ebx)\n\t" \
  90              /* Manually push ebx to private stack */ \
  91              "addl $-4,(%%eax)\n\t" \
  92              "movl 8(%%esp), %%edi\n\t" \
  93              "movl (%%eax), %%ebx\n\t" \
  94              "movl %%edi, (%%ebx)\n\t" \
  95              /* Manually push ecx to private stack */ \
  96              "addl $-4,(%%eax)\n\t" \
  97              "movl 4(%%esp), %%edi\n\t" \
  98              "movl (%%eax), %%ebx\n\t" \
  99              "movl %%edi, (%%ebx)\n\t" \
 100              /* Manually push edi to private stack */ \
 101              "addl $-4,(%%eax)\n\t" \
 102              "movl 0(%%esp), %%edi\n\t" \
 103              "movl (%%eax), %%ebx\n\t" \
 104              "movl %%edi, (%%ebx)\n\t" \
 105              /* now push regs to tls */ \
 106              /* -- esp already pushed -- */ \
 107              /* -- eax already pushed -- */ \
 108              /* -- ebx already pushed -- */ \
 109              /* -- ecx already pushed -- */ \
 110              /* -- edi already pushed -- */ \
 111              "addl $-4,(%%eax)\n\t" \
 112              "movl (%%eax), %%ebx\n\t" \
 113              "movl %%edx,(%%ebx)\n\t" \
 114              "addl $-4,(%%eax)\n\t" \
 115              "movl (%%eax), %%ebx\n\t" \
 116              "movl %%ebp,(%%ebx)\n\t" \
 117              "addl $-4,(%%eax)\n\t" \
 118              "movl (%%eax), %%ebx\n\t" \
 119              "movl %%esi,(%%ebx)\n\t" \
 120              /* push cs */ \
 121              "addl $-2,(%%eax)\n\t" \
 122              "movl (%%eax), %%ebx\n\t" \
 123              "movw %%cs, (%%ebx)\n\t" \
 124              /* push ss */ \
 125              "addl $-2,(%%eax)\n\t" \
 126              "movl (%%eax), %%ebx\n\t" \
 127              "movw %%ss, (%%ebx)\n\t" \
 128              /* restore original values of regs that were used internally */ \
 129              "popl %%edi\n\t" \
 130              "popl %%ecx\n\t" \
 131              "popl %%ebx\n\t" \
 132              "popl %%eax\n\t" \
 133              /* cancel push of rsp */ \
 134              "addl $4,%%esp\n\t" \
 135              /* cancel push of eflags */ \
 136              "addl $4,%%esp\n\t" \
 137              ::: "memory"); \
 138         memcpy(regsptr, (void *)ust_reg_stack_ptr, sizeof(struct registers)); \
 139         ust_reg_stack_ptr = (void *)(((long)ust_reg_stack_ptr) + sizeof(struct registers));
 140
 141 #else /* CONFIG_UST_GDB_INTEGRATION */
 142
 143 #define save_registers(a)
 144
 145 #endif /* CONFIG_UST_GDB_INTEGRATION */
 146
 147 #define RELATIVE_ADDRESS(__rel_label__) __rel_label__
 148
 149 #define _ASM_PTR ".long "
 150
 151 #else /* below is code for x86-64 */
 152
 153 struct registers {
 154         int padding; /* 4 bytes */
 155         short ss;
 156         short cs;
 157         unsigned long r15;
 158         unsigned long r14;
 159         unsigned long r13;
 160         unsigned long r12;
 161         unsigned long r11;
 162         unsigned long r10;
 163         unsigned long r9;
 164         unsigned long r8;
 165         unsigned long rsi;
 166         unsigned long rbp;
 167         unsigned long rdx;
 168         unsigned long rcx;
 169         unsigned long rdi;
 170         unsigned long rbx;
 171         unsigned long rax;
 172         unsigned long rflags;
 173         unsigned long rsp;
 174 };
 175
 176 #ifdef CONFIG_UST_GDB_INTEGRATION
 177
 178 #define save_registers(regsptr) \
 179         asm volatile ( \
 180              /* save original rsp */ \
 181              "pushq %%rsp\n\t" \
 182              /* push original rflags */ \
 183              "pushfq\n\t" \
 184               /* rax will hold the ptr to the private stack bottom */ \
 185              "pushq %%rax\n\t" \
 186              /* rbx will be used to temporarily hold the stack bottom addr */ \
 187              "pushq %%rbx\n\t" \
 188              /* rdi is the input to __tls_get_addr, and also a temp var */ \
 189              "pushq %%rdi\n\t" \
 190              /* Start TLS access of private reg stack pointer */ \
 191              ".byte 0x66\n\t" \
 192              "leaq ust_reg_stack_ptr@tlsgd(%%rip), %%rdi\n\t" \
 193              ".word 0x6666\n\t" \
 194              "rex64\n\t" \
 195              "call __tls_get_addr@plt\n\t" \
 196              /* --- End TLS access */ \
 197              /* check if ust_reg_stack_ptr has been initialized */ \
 198              "movq (%%rax),%%rbx\n\t" \
 199              "testq %%rbx,%%rbx\n\t" \
 200              "jne 1f\n\t" \
 201              "movq %%rax,%%rbx\n\t" \
 202              /* Start TLS access of private reg stack */ \
 203              ".byte 0x66\n\t" \
 204              "leaq ust_reg_stack@tlsgd(%%rip), %%rdi\n\t" \
 205              ".word 0x6666\n\t" \
 206              "rex64\n\t" \
 207              "call __tls_get_addr@plt\n\t" \
 208              /* --- End TLS access */ \
 209              "addq $500,%%rax\n\t" \
 210              "movq %%rax,(%%rbx)\n\t" \
 211              "movq %%rbx,%%rax\n\t" \
 212              /* now the pointer to the private stack is in rax.
 213                 must add stack size so the ptr points to the stack bottom. */ \
 214         "1:\n\t" \
 215              /* Manually push rsp to private stack */ \
 216              "addq $-8,(%%rax)\n\t" \
 217              "movq 32(%%rsp), %%rdi\n\t" \
 218              "movq (%%rax), %%rbx\n\t" \
 219              "movq %%rdi, (%%rbx)\n\t" \
 220              /* Manually push eflags to private stack */ \
 221              "addq $-8,(%%rax)\n\t" \
 222              "movq 24(%%rsp), %%rdi\n\t" \
 223              "movq (%%rax), %%rbx\n\t" \
 224              "movq %%rdi, (%%rbx)\n\t" \
 225              /* Manually push rax to private stack */ \
 226              "addq $-8,(%%rax)\n\t" \
 227              "movq 16(%%rsp), %%rdi\n\t" \
 228              "movq (%%rax), %%rbx\n\t" \
 229              "movq %%rdi, (%%rbx)\n\t" \
 230              /* Manually push rbx to private stack */ \
 231              "addq $-8,(%%rax)\n\t" \
 232              "movq 8(%%rsp), %%rdi\n\t" \
 233              "movq (%%rax), %%rbx\n\t" \
 234              "movq %%rdi, (%%rbx)\n\t" \
 235              /* Manually push rdi to private stack */ \
 236              "addq $-8,(%%rax)\n\t" \
 237              "movq 0(%%rsp), %%rdi\n\t" \
 238              "movq (%%rax), %%rbx\n\t" \
 239              "movq %%rdi, (%%rbx)\n\t" \
 240              /* now push regs to tls */ \
 241              /* -- rsp already pushed -- */ \
 242              /* -- rax already pushed -- */ \
 243              /* -- rbx already pushed -- */ \
 244              /* -- rdi already pushed -- */ \
 245              "addq $-8,(%%rax)\n\t" \
 246              "movq (%%rax), %%rbx\n\t" \
 247              "movq %%rcx,(%%rbx)\n\t" \
 248              "addq $-8,(%%rax)\n\t" \
 249              "movq (%%rax), %%rbx\n\t" \
 250              "movq %%rdx,(%%rbx)\n\t" \
 251              "addq $-8,(%%rax)\n\t" \
 252              "movq (%%rax), %%rbx\n\t" \
 253              "movq %%rbp,(%%rbx)\n\t" \
 254              "addq $-8,(%%rax)\n\t" \
 255              "movq (%%rax), %%rbx\n\t" \
 256              "movq %%rsi,(%%rbx)\n\t" \
 257              "addq $-8,(%%rax)\n\t" \
 258              "movq (%%rax), %%rbx\n\t" \
 259              "movq %%r8,(%%rbx)\n\t" \
 260              "addq $-8,(%%rax)\n\t" \
 261              "movq (%%rax), %%rbx\n\t" \
 262              "movq %%r9,(%%rbx)\n\t" \
 263              "addq $-8,(%%rax)\n\t" \
 264              "movq (%%rax), %%rbx\n\t" \
 265              "movq %%r10,(%%rbx)\n\t" \
 266              "addq $-8,(%%rax)\n\t" \
 267              "movq (%%rax), %%rbx\n\t" \
 268              "movq %%r11,(%%rbx)\n\t" \
 269              "addq $-8,(%%rax)\n\t" \
 270              "movq (%%rax), %%rbx\n\t" \
 271              "movq %%r12,(%%rbx)\n\t" \
 272              "addq $-8,(%%rax)\n\t" \
 273              "movq (%%rax), %%rbx\n\t" \
 274              "movq %%r13,(%%rbx)\n\t" \
 275              "addq $-8,(%%rax)\n\t" \
 276              "movq (%%rax), %%rbx\n\t" \
 277              "movq %%r14,(%%rbx)\n\t" \
 278              "addq $-8,(%%rax)\n\t" \
 279              "movq (%%rax), %%rbx\n\t" \
 280              "movq %%r15,(%%rbx)\n\t" \
 281              /* push cs */ \
 282              "addq $-2,(%%rax)\n\t" \
 283              "movq (%%rax), %%rbx\n\t" \
 284              "movw %%cs, (%%rbx)\n\t" \
 285              /* push ss */ \
 286              "addq $-2,(%%rax)\n\t" \
 287              "movq (%%rax), %%rbx\n\t" \
 288              "movw %%ss, (%%rbx)\n\t" \
 289              /* add padding for struct registers */ \
 290              "addq $-4,(%%rax)\n\t" \
 291              /* restore original values of regs that were used internally */ \
 292              "popq %%rdi\n\t" \
 293              "popq %%rbx\n\t" \
 294              "popq %%rax\n\t" \
 295              /* cancel push of rsp */ \
 296              "addq $8,%%rsp\n\t" \
 297              /* cancel push of rflags */ \
 298              "addq $8,%%rsp\n\t" \
 299              ::); \
 300         memcpy(regsptr, (void *)ust_reg_stack_ptr, sizeof(struct registers)); \
 301         ust_reg_stack_ptr = (void *)(((long)ust_reg_stack_ptr) + sizeof(struct registers));
 302
 303 #else /* CONFIG_UST_GDB_INTEGRATION */
 304
 305 #define save_registers(a)
 306
 307 #endif /* CONFIG_UST_GDB_INTEGRATION */
 308
 309 /* Macro to insert the address of a relative jump in an assembly stub,
 310  * in a relocatable way. On x86-64, this uses a special (%rip) notation. */
 311 #define RELATIVE_ADDRESS(__rel_label__) __rel_label__(%%rip)
 312
 313 #define _ASM_PTR ".quad "
 314
 315 #endif
 316
 317 #endif /* UST_PROCESSOR_H */