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kernel/x86_64: clear carry, nested task and trap flags on syscall entry

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this is what's generally done on other OSes.

Change-Id: I90f1a574172b8e020c9943468d2fd121e14dd062
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4047
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: Adrien Destugues <[email protected]>
This commit is contained in:
Jérôme Duval
2021-06-06 07:23:10 +00:00
committed by Adrien Destugues
parent 55a7cd0a12
commit addd392113
1 changed files with 3 additions and 2 deletions
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src/system/kernel/arch/x86/64/syscalls.cpp
+3 -2
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@@ -54,9 +54,10 @@ init_syscall_registers(void* dummy, int cpuNum)
x86_write_msr(IA32_MSR_EFER, x86_read_msr(IA32_MSR_EFER)
| IA32_MSR_EFER_SYSCALL);
// Flags to clear upon entry. Want interrupts disabled and the direction
// flag cleared.
// Flags to clear upon entry. Want interrupts disabled and the carry, trap,
// nested task, direction and alignment check flags cleared.
x86_write_msr(IA32_MSR_FMASK, X86_EFLAGS_INTERRUPT | X86_EFLAGS_DIRECTION
| X86_EFLAGS_NESTED_TASK | X86_EFLAGS_CARRY | X86_EFLAGS_TRAP
| X86_EFLAGS_ALIGNMENT_CHECK);
// Entry point address.