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[AArch64] Codegen support for FEAT_PAuthLR
- Adds a new +pc option to -mbranch-protection that will enable the use of PC as a diversifier in PAC branch protection code. - When +pauth-lr is enabled (-march=armv9.5a+pauth-lr) in combination with -mbranch-protection=pac-ret+pc, the new 9.5-a instructions (pacibsppc, retaasppc, etc) are used. Documentation for the relevant instructions can be found here: https://developer.arm.com/documentation/ddi0602/2023-09/Base-Instructions/ Co-authored-by: Lucas Prates <lucas.prates@arm.com>
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// Check the -cc1 flags for the various forms of -mbranch-protection=pac-ret+pc. | ||
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// RUN: %clang -target aarch64-arm-none-eabi -c %s -### -mbranch-protection=pac-ret+pc 2>&1 | FileCheck %s --check-prefixes=PAUTH-LR | ||
// RUN: %clang -target aarch64-arm-none-eabi -c %s -### -mbranch-protection=pac-ret+pc+b-key 2>&1 | FileCheck %s --check-prefixes=PAUTH-LR-B-KEY | ||
// RUN: %clang -target aarch64-arm-none-eabi -c %s -### -mbranch-protection=pac-ret+pc+leaf 2>&1 | FileCheck %s --check-prefixes=PAUTH-LR-LEAF | ||
// RUN: %clang -target aarch64-arm-none-eabi -c %s -### -mbranch-protection=pac-ret+pc+bti 2>&1 | FileCheck %s --check-prefixes=PAUTH-LR-BTI | ||
// RUN: %clang -target aarch64-arm-none-eabi -c %s -### -mbranch-protection=pac-ret+pc+leaf+b-key+bti 2>&1 | FileCheck %s --check-prefixes=PAUTH-LR-LEAF-B-KEY-BTI | ||
// RUN: %clang -target aarch64-arm-none-eabi -c %s -### -mbranch-protection=pac-ret+pc -march=armv9.5-a 2>&1 | FileCheck %s --check-prefixes=PAUTH-LR | ||
// RUN: %clang -target aarch64-arm-none-eabi -c %s -### -mbranch-protection=pac-ret+pc+b-key -march=armv9.5-a 2>&1 | FileCheck %s --check-prefixes=PAUTH-LR-B-KEY | ||
// RUN: %clang -target aarch64-arm-none-eabi -c %s -### -mbranch-protection=pac-ret+pc+leaf -march=armv9.5-a 2>&1 | FileCheck %s --check-prefixes=PAUTH-LR-LEAF | ||
// RUN: %clang -target aarch64-arm-none-eabi -c %s -### -mbranch-protection=pac-ret+pc+bti -march=armv9.5-a 2>&1 | FileCheck %s --check-prefixes=PAUTH-LR-BTI | ||
// RUN: %clang -target aarch64-arm-none-eabi -c %s -### -mbranch-protection=pac-ret+pc+leaf+b-key+bti -march=armv9.5-a 2>&1 | FileCheck %s --check-prefixes=PAUTH-LR-LEAF-B-KEY-BTI | ||
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// PAUTH-LR: "-msign-return-address=non-leaf" "-msign-return-address-key=a_key" "-mbranch-protection-pauth-lr" | ||
// PAUTH-LR-B-KEY: "-msign-return-address=non-leaf" "-msign-return-address-key=b_key" "-mbranch-protection-pauth-lr" | ||
// PAUTH-LR-LEAF: "-msign-return-address=all" "-msign-return-address-key=a_key" "-mbranch-protection-pauth-lr" | ||
// PAUTH-LR-BTI: "-msign-return-address=non-leaf" "-msign-return-address-key=a_key" "-mbranch-protection-pauth-lr" | ||
// PAUTH-LR-LEAF-B-KEY-BTI: "-msign-return-address=all" "-msign-return-address-key=b_key" "-mbranch-protection-pauth-lr" "-mbranch-target-enforce" | ||
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// NOT-PAUTH-LR: "-mbranch-target-enforce" | ||
// NOT-PAUTH-LR-B-KEY: "-mbranch-target-enforce" | ||
// NOT-PAUTH-LR-LEAF: "-mbranch-target-enforce" | ||
// NOT-PAUTH-LR-BTI: "-mbranch-target-enforce" |
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