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[AArch64][SME] Add BTI and No Exec Stack markers to sme-abi.S (#84895)

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Adding BTI landing pads compiler-rt is built with -mbranch-protectoin.
Tabulators are changed to 2 spaces for consistency.
This commit is contained in:
Dani
2024-03-12 12:36:05 +01:00
committed by GitHub
parent 3358838446
commit a7ef83f005
1 changed files with 22 additions and 12 deletions
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34
compiler-rt/lib/builtins/aarch64/sme-abi.S
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@@ -26,9 +26,10 @@
// abort(). Note that there is no need to preserve any state before the call,
// because the function does not return.
DEFINE_COMPILERRT_PRIVATE_FUNCTION(do_abort)
.cfi_startproc
.variant_pcs SYMBOL_NAME(do_abort)
stp x29, x30, [sp, #-32]!
.cfi_startproc
.variant_pcs SYMBOL_NAME(do_abort)
BTI_C
stp x29, x30, [sp, #-32]!
cntd x0
// Store VG to a stack location that we describe with .cfi_offset
str x0, [sp, #16]
@@ -36,22 +37,23 @@ DEFINE_COMPILERRT_PRIVATE_FUNCTION(do_abort)
.cfi_offset w30, -24
.cfi_offset w29, -32
.cfi_offset 46, -16
bl __arm_sme_state
tbz x0, #0, 2f
bl __arm_sme_state
tbz x0, #0, 2f
1:
smstop sm
smstop sm
2:
// We can't make this into a tail-call because the unwinder would
// need to restore the value of VG.
bl SYMBOL_NAME(abort)
.cfi_endproc
bl SYMBOL_NAME(abort)
.cfi_endproc
END_COMPILERRT_FUNCTION(do_abort)
// __arm_sme_state fills the result registers based on a local
// that is set as part of the compiler-rt startup code.
// __aarch64_has_sme_and_tpidr2_el0
DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(__arm_sme_state)
.variant_pcs __arm_sme_state
.variant_pcs __arm_sme_state
BTI_C
mov x0, xzr
mov x1, xzr
@@ -68,7 +70,8 @@ DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(__arm_sme_state)
END_COMPILERRT_OUTLINE_FUNCTION(__arm_sme_state)
DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(__arm_tpidr2_restore)
.variant_pcs __arm_tpidr2_restore
.variant_pcs __arm_tpidr2_restore
BTI_C
// If TPIDR2_EL0 is nonnull, the subroutine aborts in some platform-specific
// manner.
mrs x14, TPIDR2_EL0
@@ -103,7 +106,8 @@ DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(__arm_tpidr2_restore)
END_COMPILERRT_OUTLINE_FUNCTION(__arm_tpidr2_restore)
DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(__arm_tpidr2_save)
.variant_pcs __arm_tpidr2_restore
.variant_pcs __arm_tpidr2_restore
BTI_C
// If the current thread does not have access to TPIDR2_EL0, the subroutine
// does nothing.
adrp x14, TPIDR2_SYMBOL
@@ -143,7 +147,8 @@ DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(__arm_tpidr2_save)
END_COMPILERRT_OUTLINE_FUNCTION(__arm_tpidr2_save)
DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(__arm_za_disable)
.variant_pcs __arm_tpidr2_restore
.variant_pcs __arm_tpidr2_restore
BTI_C
// If the current thread does not have access to SME, the subroutine does
// nothing.
adrp x14, TPIDR2_SYMBOL
@@ -174,3 +179,8 @@ DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(__arm_za_disable)
0:
ret
END_COMPILERRT_OUTLINE_FUNCTION(__arm_za_disable)
NO_EXEC_STACK_DIRECTIVE
// GNU property note for BTI and PAC
GNU_PROPERTY_BTI_PAC