setcontext.S 2.5 KB

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  1. /*
  2. * Copyright (C) 2011-2017 Intel Corporation. All rights reserved.
  3. *
  4. * Redistribution and use in source and binary forms, with or without
  5. * modification, are permitted provided that the following conditions
  6. * are met:
  7. *
  8. * * Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * * Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in
  12. * the documentation and/or other materials provided with the
  13. * distribution.
  14. * * Neither the name of Intel Corporation nor the names of its
  15. * contributors may be used to endorse or promote products derived
  16. * from this software without specific prior written permission.
  17. *
  18. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19. * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20. * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21. * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22. * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24. * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25. * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26. * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27. * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28. * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29. *
  30. */
  31. #include "offsets.h"
  32. .global setcontext
  33. .type setcontext, @function
  34. setcontext:
  35. movl 4(%esp),%eax /* ucontext_t* */
  36. /* restore FP state */
  37. movl LINUX_UC_FPREGS_PTR_OFF(%eax), %ecx
  38. fldenv (%ecx)
  39. #ifdef SE_SIM
  40. /* restore FS */
  41. movl (LINUX_UC_MCONTEXT_OFF+LINUX_SC_FS_OFF)(%eax), %ecx
  42. movl %ecx, %fs
  43. #endif
  44. /* new stack */
  45. movl (LINUX_UC_MCONTEXT_OFF+LINUX_SC_ESP_OFF)(%eax), %esp
  46. /* push the return address on the stack */
  47. movl (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EIP_OFF)(%eax), %ecx
  48. pushl %ecx
  49. /* restore GPRs */
  50. movl (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EDI_OFF)(%eax), %edi
  51. movl (LINUX_UC_MCONTEXT_OFF+LINUX_SC_ESI_OFF)(%eax), %esi
  52. movl (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EBP_OFF)(%eax), %ebp
  53. movl (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EBX_OFF)(%eax), %ebx
  54. movl (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EDX_OFF)(%eax), %edx
  55. movl (LINUX_UC_MCONTEXT_OFF+LINUX_SC_ECX_OFF)(%eax), %ecx
  56. movl (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EAX_OFF)(%eax), %eax
  57. ret