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Perserve registers that are not automatically perserved across functi… #2

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Perserve registers that are not automatically perserved across functi… #2

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23 changes: 18 additions & 5 deletions arch/x86/entry/entry_64.S
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Original file line number Diff line number Diff line change
Expand Up @@ -526,18 +526,31 @@ SYM_INNER_LABEL(swapgs_restore_regs_and_return_to_usermode, SYM_L_GLOBAL)

tuLab:
/* Preserve rax */
pushq %rax
pushq %r11
pushq %r10
 pushq %rax
 pushq %rcx
 pushq %rdx
 pushq %rsi
 pushq %rdi
 pushq %r8
 pushq %r9
 pushq %r10
 pushq %r11

/* This reads elevated flag out of current task struct... for now. */

call magic_check_elevate
/* Bitwise and */
testb $0x1, %al

popq %r10
popq %r11
popq %rax
popq %r10
popq %r9
popq %r8
popq %rdi
popq %rsi
popq %rdx
popq %rcx
  popq %rax

/*Jump if not zero ZF=0*/
jnz tu_set_kern_cs
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