libsyscall/wrappers/thread_register_state.c

   1 /*
   2  * Copyright (c) 2015 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 #include <mach/mach.h>
  29
  30 kern_return_t
  31 thread_get_register_pointer_values(thread_t thread, uintptr_t *sp, size_t *length, uintptr_t *values)
  32 {
  33     if (!length) return KERN_INVALID_ARGUMENT;
  34     if (*length > 0 && values == NULL) return KERN_INVALID_ARGUMENT;
  35
  36     size_t in_length = *length;
  37     size_t out_length = 0;
  38
  39 #if defined(__i386__)
  40     i386_thread_state_t state = {};
  41     thread_state_flavor_t flavor = x86_THREAD_STATE32;
  42     mach_msg_type_number_t count = i386_THREAD_STATE_COUNT;
  43 #elif defined(__x86_64__)
  44     x86_thread_state64_t state = {};
  45     thread_state_flavor_t flavor = x86_THREAD_STATE64;
  46     mach_msg_type_number_t count = x86_THREAD_STATE64_COUNT;
  47 #else
  48 #error thread_get_register_pointer_values not defined for this architecture
  49 #endif
  50
  51     kern_return_t ret = thread_get_state(thread, flavor, (thread_state_t)&state, &count);
  52     if (ret != KERN_SUCCESS){
  53         return ret;
  54     }
  55
  56     // If the provided pointer value is > PAGE_SIZE, add it to the output array
  57     // if there's available space.  (Values between 0 and PAGE_SIZE are the NULL page
  58     // and not valid pointers.)
  59 #define push_register_value(p) do { \
  60     if ((uintptr_t)p > PAGE_SIZE) { \
  61         if (out_length < in_length && values) \
  62             values[out_length] = p; \
  63         out_length++; \
  64     } } while (0)
  65
  66 #if defined(__i386__)
  67     if (sp) *sp = state.__esp;
  68
  69     push_register_value(state.__eip);
  70
  71     push_register_value(state.__eax);
  72     push_register_value(state.__ebx);
  73     push_register_value(state.__ecx);
  74     push_register_value(state.__edx);
  75     push_register_value(state.__edi);
  76     push_register_value(state.__esi);
  77     push_register_value(state.__ebp);
  78 #elif defined(__x86_64__)
  79     if (sp) *sp = state.__rsp - 128 /* redzone */;
  80
  81     push_register_value(state.__rip);
  82
  83     push_register_value(state.__rax);
  84     push_register_value(state.__rbx);
  85     push_register_value(state.__rcx);
  86     push_register_value(state.__rdx);
  87     push_register_value(state.__rdi);
  88     push_register_value(state.__rbp);
  89     push_register_value(state.__r8);
  90     push_register_value(state.__r9);
  91     push_register_value(state.__r10);
  92     push_register_value(state.__r11);
  93     push_register_value(state.__r12);
  94     push_register_value(state.__r13);
  95     push_register_value(state.__r14);
  96     push_register_value(state.__r15);
  97 #else
  98 #error thread_get_register_pointer_values not defined for this architecture
  99 #endif
 100
 101     *length = out_length;
 102
 103     if (in_length == 0 || out_length > in_length){
 104         return KERN_INSUFFICIENT_BUFFER_SIZE;
 105     }
 106
 107         return KERN_SUCCESS;
 108 }