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Linux/tools/testing/selftests/x86/thunks.S

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  * thunks.S - assembly helpers for mixed-bitness code
  4  * Copyright (c) 2015 Andrew Lutomirski
  5  *
  6  * These are little helpers that make it easier to switch bitness on
  7  * the fly.
  8  */
  9 
 10         .text
 11 
 12         .global call32_from_64
 13         .type call32_from_64, @function
 14 call32_from_64:
 15         // rdi: stack to use
 16         // esi: function to call
 17 
 18         // Save registers
 19         pushq %rbx
 20         pushq %rbp
 21         pushq %r12
 22         pushq %r13
 23         pushq %r14
 24         pushq %r15
 25         pushfq
 26 
 27         // Switch stacks
 28         mov %rsp,(%rdi)
 29         mov %rdi,%rsp
 30 
 31         // Switch to compatibility mode
 32         pushq $0x23  /* USER32_CS */
 33         pushq $1f
 34         lretq
 35 
 36 1:
 37         .code32
 38         // Call the function
 39         call *%esi
 40         // Switch back to long mode
 41         jmp $0x33,$1f
 42         .code64
 43 
 44 1:
 45         // Restore the stack
 46         mov (%rsp),%rsp
 47 
 48         // Restore registers
 49         popfq
 50         popq %r15
 51         popq %r14
 52         popq %r13
 53         popq %r12
 54         popq %rbp
 55         popq %rbx
 56 
 57         ret
 58 
 59 .size call32_from_64, .-call32_from_64

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