tools/perf/arch/x86/tests/regs_load.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #include <linux/linkage.h>
   3
   4 #define AX       0
   5 #define BX       1 * 8
   6 #define CX       2 * 8
   7 #define DX       3 * 8
   8 #define SI       4 * 8
   9 #define DI       5 * 8
  10 #define BP       6 * 8
  11 #define SP       7 * 8
  12 #define IP       8 * 8
  13 #define FLAGS    9 * 8
  14 #define CS      10 * 8
  15 #define SS      11 * 8
  16 #define DS      12 * 8
  17 #define ES      13 * 8
  18 #define FS      14 * 8
  19 #define GS      15 * 8
  20 #define R8      16 * 8
  21 #define R9      17 * 8
  22 #define R10     18 * 8
  23 #define R11     19 * 8
  24 #define R12     20 * 8
  25 #define R13     21 * 8
  26 #define R14     22 * 8
  27 #define R15     23 * 8
  28
  29 .text
  30 #ifdef HAVE_ARCH_X86_64_SUPPORT
  31 ENTRY(perf_regs_load)
  32         movq %rax, AX(%rdi)
  33         movq %rbx, BX(%rdi)
  34         movq %rcx, CX(%rdi)
  35         movq %rdx, DX(%rdi)
  36         movq %rsi, SI(%rdi)
  37         movq %rdi, DI(%rdi)
  38         movq %rbp, BP(%rdi)
  39
  40         leaq 8(%rsp), %rax /* exclude this call.  */
  41         movq %rax, SP(%rdi)
  42
  43         movq 0(%rsp), %rax
  44         movq %rax, IP(%rdi)
  45
  46         movq $0, FLAGS(%rdi)
  47         movq $0, CS(%rdi)
  48         movq $0, SS(%rdi)
  49         movq $0, DS(%rdi)
  50         movq $0, ES(%rdi)
  51         movq $0, FS(%rdi)
  52         movq $0, GS(%rdi)
  53
  54         movq %r8,  R8(%rdi)
  55         movq %r9,  R9(%rdi)
  56         movq %r10, R10(%rdi)
  57         movq %r11, R11(%rdi)
  58         movq %r12, R12(%rdi)
  59         movq %r13, R13(%rdi)
  60         movq %r14, R14(%rdi)
  61         movq %r15, R15(%rdi)
  62         ret
  63 ENDPROC(perf_regs_load)
  64 #else
  65 ENTRY(perf_regs_load)
  66         push %edi
  67         movl 8(%esp), %edi
  68         movl %eax, AX(%edi)
  69         movl %ebx, BX(%edi)
  70         movl %ecx, CX(%edi)
  71         movl %edx, DX(%edi)
  72         movl %esi, SI(%edi)
  73         pop %eax
  74         movl %eax, DI(%edi)
  75         movl %ebp, BP(%edi)
  76
  77         leal 4(%esp), %eax /* exclude this call.  */
  78         movl %eax, SP(%edi)
  79
  80         movl 0(%esp), %eax
  81         movl %eax, IP(%edi)
  82
  83         movl $0, FLAGS(%edi)
  84         movl $0, CS(%edi)
  85         movl $0, SS(%edi)
  86         movl $0, DS(%edi)
  87         movl $0, ES(%edi)
  88         movl $0, FS(%edi)
  89         movl $0, GS(%edi)
  90         ret
  91 ENDPROC(perf_regs_load)
  92 #endif
  93
  94 /*
  95  * We need to provide note.GNU-stack section, saying that we want
  96  * NOT executable stack. Otherwise the final linking will assume that
  97  * the ELF stack should not be restricted at all and set it RWX.
  98  */
  99 .section .note.GNU-stack,"",@progbits