cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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regs_load.S (1937B)

      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
     31SYM_FUNC_START(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
     63SYM_FUNC_END(perf_regs_load)
     64#else
     65SYM_FUNC_START(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
     91SYM_FUNC_END(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