/* This code needs to be called *after* the enclave stack has been setup. */
/* There are 3 places where this needs to happen, so this is put in a macro. */
-.macro sanitize_rflags
+.macro entry_sanitize_final
/* Sanitize rflags received from user */
/* - DF flag: x86-64 ABI requires DF to be unset at function entry/exit */
/* - AC flag: AEX on misaligned memory accesses leaks side channel info */
pushfq
andq $~0x40400, (%rsp)
popfq
+ bt $0,.Laborted(%rip)
+ jc .Lreentry_panic
.endm
.text
jz .Lskip_debug_init
mov %r10,%gs:tcsls_debug_panic_buf_ptr
.Lskip_debug_init:
-/* check for abort */
- bt $0,.Laborted(%rip)
- jc .Lreentry_panic
/* check if returning from usercall */
mov %gs:tcsls_last_rsp,%r11
test %r11,%r11
lea IMAGE_BASE(%rip),%rax
add %rax,%rsp
mov %rsp,%gs:tcsls_tos
- sanitize_rflags
+ entry_sanitize_final
/* call tcs_init */
/* store caller-saved registers in callee-saved registers */
mov %rdi,%rbx
mov %r15,%r9
jmp .Lafter_init
.Lskip_init:
- sanitize_rflags
+ entry_sanitize_final
.Lafter_init:
/* call into main entry point */
load_tcsls_flag_secondary_bool cx /* RCX = entry() argument: secondary: bool */
movq $0,%gs:tcsls_last_rsp
/* restore callee-saved state, cf. "save" above */
mov %r11,%rsp
- sanitize_rflags
ldmxcsr (%rsp)
fldcw 4(%rsp)
add $8, %rsp
+ entry_sanitize_final
pop %rbx
pop %rbp
pop %r12