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From: Andrea Corallo <andrea.corallo@arm.com>
To: Richard Earnshaw <Richard.Earnshaw@foss.arm.com>
Cc: Andrea Corallo via Gcc-patches <gcc-patches@gcc.gnu.org>,
	"Richard Earnshaw" <Richard.Earnshaw@arm.com>, nd <nd@arm.com>
Subject: [PATCH 10/15 V7] arm: Implement cortex-M return signing address codegen
Date: Wed, 11 Jan 2023 10:58:47 +0100	[thread overview]
Message-ID: <gkrzgappf3c.fsf_-_@arm.com> (raw)
In-Reply-To: <e15d5501-73aa-f3ff-e8f4-e80fde9c22d0@foss.arm.com> (Richard Earnshaw's message of "Wed, 14 Dec 2022 16:45:05 +0000")

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Richard Earnshaw <Richard.Earnshaw@foss.arm.com> writes:

[...]

>
> Otherwise ok with that change.
>
> R.

Minor respin of this patch addressing the suggestion to have
'use_return_insn' return zero when PAC is enabled.

BR

  Andrea


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From 0a894f73fc09be865b7a7cb205e871bf82f8abba Mon Sep 17 00:00:00 2001
From: Andrea Corallo <andrea.corallo@arm.com>
Date: Thu, 20 Jan 2022 15:36:23 +0100
Subject: [PATCH] [PATCH 10/15] arm: Implement cortex-M return signing address
 codegen

Hi all,

this patch enables address return signature and verification based on
Armv8.1-M Pointer Authentication [1].

To sign the return address, we use the PAC R12, LR, SP instruction
upon function entry.  This is signing LR using SP and storing the
result in R12.  R12 will be pushed into the stack.

During function epilogue R12 will be popped and AUT R12, LR, SP will
be used to verify that the content of LR is still valid before return.

Here an example of PAC instrumented function prologue and epilogue:

void foo (void);

int main()
{
  foo ();
  return 0;
}

Compiled with '-march=armv8.1-m.main -mbranch-protection=pac-ret
-mthumb' translates into:

main:
	pac	ip, lr, sp
	push	{r3, r7, ip, lr}
	add	r7, sp, #0
	bl	foo
	movs	r3, #0
	mov	r0, r3
	pop	{r3, r7, ip, lr}
	aut	ip, lr, sp
	bx	lr

The patch also takes care of generating a PACBTI instruction in place
of the sequence BTI+PAC when Branch Target Identification is enabled
contextually.

Ex. the previous example compiled with '-march=armv8.1-m.main
-mbranch-protection=pac-ret+bti -mthumb' translates into:

main:
	pacbti	ip, lr, sp
	push	{r3, r7, ip, lr}
	add	r7, sp, #0
	bl	foo
	movs	r3, #0
	mov	r0, r3
	pop	{r3, r7, ip, lr}
	aut	ip, lr, sp
	bx	lr

As part of previous upstream suggestions a test for varargs has been
added and '-mtpcs-frame' is deemed being incompatible with this return
signing address feature being introduced.

[1] <https://community.arm.com/developer/ip-products/processors/b/processors-ip-blog/posts/armv8-1-m-pointer-authentication-and-branch-target-identification-extension>

gcc/Changelog

2021-11-03  Andrea Corallo  <andrea.corallo@arm.com>

	* config/arm/arm.h (arm_arch8m_main): Declare it.
	* config/arm/arm.cc (arm_arch8m_main): Define it.
	(arm_option_reconfigure_globals): Set arm_arch8m_main.
	(arm_compute_frame_layout, arm_expand_prologue)
	(thumb2_expand_return, arm_expand_epilogue)
	(arm_conditional_register_usage): Update for pac codegen.
	(arm_current_function_pac_enabled_p): New function.
	(aarch_bti_enabled) New function.
	(use_return_insn): Return zero when pac is enabled.
	* config/arm/arm.md (pac_ip_lr_sp, pacbti_ip_lr_sp, aut_ip_lr_sp):
	Add new patterns.
	* config/arm/unspecs.md (UNSPEC_PAC_NOP)
	(VUNSPEC_PACBTI_NOP, VUNSPEC_AUT_NOP): Add unspecs.

gcc/testsuite/Changelog

2021-11-03  Andrea Corallo  <andrea.corallo@arm.com>

	* gcc.target/arm/pac.h : New file.
	* gcc.target/arm/pac-1.c : New test case.
	* gcc.target/arm/pac-2.c : Likewise.
	* gcc.target/arm/pac-3.c : Likewise.
	* gcc.target/arm/pac-4.c : Likewise.
	* gcc.target/arm/pac-5.c : Likewise.
	* gcc.target/arm/pac-6.c : Likewise.
	* gcc.target/arm/pac-7.c : Likewise.
	* gcc.target/arm/pac-8.c : Likewise.
	* gcc.target/arm/pac-9.c : Likewise.
	* gcc.target/arm/pac-10.c : Likewise.
	* gcc.target/arm/pac-11.c : Likewise.
---
 gcc/config/arm/arm-protos.h           |  1 +
 gcc/config/arm/arm.cc                 | 79 ++++++++++++++++++++++++---
 gcc/config/arm/arm.h                  |  4 ++
 gcc/config/arm/arm.md                 | 23 ++++++++
 gcc/config/arm/unspecs.md             |  3 +
 gcc/testsuite/gcc.target/arm/pac-1.c  | 11 ++++
 gcc/testsuite/gcc.target/arm/pac-10.c | 10 ++++
 gcc/testsuite/gcc.target/arm/pac-11.c | 10 ++++
 gcc/testsuite/gcc.target/arm/pac-2.c  | 11 ++++
 gcc/testsuite/gcc.target/arm/pac-3.c  | 11 ++++
 gcc/testsuite/gcc.target/arm/pac-4.c  | 10 ++++
 gcc/testsuite/gcc.target/arm/pac-5.c  | 28 ++++++++++
 gcc/testsuite/gcc.target/arm/pac-6.c  | 18 ++++++
 gcc/testsuite/gcc.target/arm/pac-7.c  | 32 +++++++++++
 gcc/testsuite/gcc.target/arm/pac-8.c  | 34 ++++++++++++
 gcc/testsuite/gcc.target/arm/pac-9.c  | 11 ++++
 gcc/testsuite/gcc.target/arm/pac.h    | 17 ++++++
 17 files changed, 304 insertions(+), 9 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/arm/pac-1.c
 create mode 100644 gcc/testsuite/gcc.target/arm/pac-10.c
 create mode 100644 gcc/testsuite/gcc.target/arm/pac-11.c
 create mode 100644 gcc/testsuite/gcc.target/arm/pac-2.c
 create mode 100644 gcc/testsuite/gcc.target/arm/pac-3.c
 create mode 100644 gcc/testsuite/gcc.target/arm/pac-4.c
 create mode 100644 gcc/testsuite/gcc.target/arm/pac-5.c
 create mode 100644 gcc/testsuite/gcc.target/arm/pac-6.c
 create mode 100644 gcc/testsuite/gcc.target/arm/pac-7.c
 create mode 100644 gcc/testsuite/gcc.target/arm/pac-8.c
 create mode 100644 gcc/testsuite/gcc.target/arm/pac-9.c
 create mode 100644 gcc/testsuite/gcc.target/arm/pac.h

diff --git a/gcc/config/arm/arm-protos.h b/gcc/config/arm/arm-protos.h
index 6e6bf147e9c..d97a1c3bf56 100644
--- a/gcc/config/arm/arm-protos.h
+++ b/gcc/config/arm/arm-protos.h
@@ -378,6 +378,7 @@ extern int vfp3_const_double_for_bits (rtx);
 extern void arm_emit_coreregs_64bit_shift (enum rtx_code, rtx, rtx, rtx, rtx,
 					   rtx);
 extern bool arm_fusion_enabled_p (tune_params::fuse_ops);
+extern bool arm_current_function_pac_enabled_p (void);
 extern bool arm_valid_symbolic_address_p (rtx);
 extern bool arm_validize_comparison (rtx *, rtx *, rtx *);
 extern bool arm_expand_vector_compare (rtx, rtx_code, rtx, rtx, bool);
diff --git a/gcc/config/arm/arm.cc b/gcc/config/arm/arm.cc
index 972d5699700..53d9dbbd691 100644
--- a/gcc/config/arm/arm.cc
+++ b/gcc/config/arm/arm.cc
@@ -923,6 +923,11 @@ int arm_arch8_3 = 0;
 
 /* Nonzero if this chip supports the ARM Architecture 8.4 extensions.  */
 int arm_arch8_4 = 0;
+
+/* Nonzero if this chip supports the ARM Architecture 8-M Mainline
+   extensions.  */
+int arm_arch8m_main = 0;
+
 /* Nonzero if this chip supports the ARM Architecture 8.1-M Mainline
    extensions.  */
 int arm_arch8_1m_main = 0;
@@ -3205,6 +3210,15 @@ arm_option_override_internal (struct gcc_options *opts,
       arm_stack_protector_guard_offset = offs;
     }
 
+  if (arm_current_function_pac_enabled_p ())
+    {
+      if (!arm_arch8m_main)
+        error ("This architecture does not support branch protection "
+               "instructions");
+      if (TARGET_TPCS_FRAME)
+        sorry ("Return address signing is not supported with %<-mtpcs-frame%>.");
+    }
+
 #ifdef SUBTARGET_OVERRIDE_INTERNAL_OPTIONS
   SUBTARGET_OVERRIDE_INTERNAL_OPTIONS;
 #endif
@@ -3851,6 +3865,7 @@ arm_option_reconfigure_globals (void)
   arm_arch_arm_hwdiv = bitmap_bit_p (arm_active_target.isa, isa_bit_adiv);
   arm_arch_crc = bitmap_bit_p (arm_active_target.isa, isa_bit_crc32);
   arm_arch_cmse = bitmap_bit_p (arm_active_target.isa, isa_bit_cmse);
+  arm_arch8m_main = arm_arch7 && arm_arch_cmse;
   arm_arch_lpae = bitmap_bit_p (arm_active_target.isa, isa_bit_lpae);
   arm_arch_i8mm = bitmap_bit_p (arm_active_target.isa, isa_bit_i8mm);
   arm_arch_bf16 = bitmap_bit_p (arm_active_target.isa, isa_bit_bf16);
@@ -4350,6 +4365,11 @@ use_return_insn (int iscond, rtx sibling)
   if (!reload_completed)
     return 0;
 
+  /* Never use a return instruction when return address signing
+     mechanism is enabled.  */
+  if (arm_current_function_pac_enabled_p ())
+    return 0;
+
   func_type = arm_current_func_type ();
 
   /* Naked, volatile and stack alignment functions need special
@@ -21227,6 +21247,9 @@ arm_compute_save_core_reg_mask (void)
 
   save_reg_mask |= arm_compute_save_reg0_reg12_mask ();
 
+  if (arm_current_function_pac_enabled_p ())
+    save_reg_mask |= 1 << IP_REGNUM;
+
   /* Decide if we need to save the link register.
      Interrupt routines have their own banked link register,
      so they never need to save it.
@@ -23518,12 +23541,13 @@ arm_expand_prologue (void)
 
   /* The static chain register is the same as the IP register.  If it is
      clobbered when creating the frame, we need to save and restore it.  */
-  clobber_ip = IS_NESTED (func_type)
-	       && ((TARGET_APCS_FRAME && frame_pointer_needed && TARGET_ARM)
-		   || ((flag_stack_check == STATIC_BUILTIN_STACK_CHECK
-			|| flag_stack_clash_protection)
-		       && !df_regs_ever_live_p (LR_REGNUM)
-		       && arm_r3_live_at_start_p ()));
+  clobber_ip = (IS_NESTED (func_type)
+                && (((TARGET_APCS_FRAME && frame_pointer_needed && TARGET_ARM)
+                     || ((flag_stack_check == STATIC_BUILTIN_STACK_CHECK
+                          || flag_stack_clash_protection)
+                         && !df_regs_ever_live_p (LR_REGNUM)
+                         && arm_r3_live_at_start_p ()))
+                    || arm_current_function_pac_enabled_p ()));
 
   /* Find somewhere to store IP whilst the frame is being created.
      We try the following places in order:
@@ -23548,7 +23572,6 @@ arm_expand_prologue (void)
 	{
 	  rtx addr, dwarf;
 
-	  gcc_assert(arm_compute_static_chain_stack_bytes() == 4);
 	  saved_regs += 4;
 
 	  addr = gen_rtx_PRE_DEC (Pmode, stack_pointer_rtx);
@@ -23599,6 +23622,17 @@ arm_expand_prologue (void)
 	}
     }
 
+  if (arm_current_function_pac_enabled_p ())
+    {
+      /* If IP was clobbered we only emit a PAC instruction as the BTI
+         one will be added before the push of the clobbered IP (if
+         necessary) by the bti pass.  */
+      if (aarch_bti_enabled () && !clobber_ip)
+	emit_insn (gen_pacbti_nop ());
+      else
+	emit_insn (gen_pac_nop ());
+    }
+
   if (TARGET_APCS_FRAME && frame_pointer_needed && TARGET_ARM)
     {
       if (IS_INTERRUPT (func_type))
@@ -27410,7 +27444,14 @@ thumb2_expand_return (bool simple_return)
 	 to assert it for now to ensure that future code changes do not silently
 	 change this behavior.  */
       gcc_assert (!IS_CMSE_ENTRY (arm_current_func_type ()));
-      if (num_regs == 1)
+      if (arm_current_function_pac_enabled_p ())
+        {
+          gcc_assert (!(saved_regs_mask & (1 << PC_REGNUM)));
+          arm_emit_multi_reg_pop (saved_regs_mask);
+          emit_insn (gen_aut_nop ());
+          emit_jump_insn (simple_return_rtx);
+        }
+      else if (num_regs == 1)
         {
           rtx par = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (2));
           rtx reg = gen_rtx_REG (SImode, PC_REGNUM);
@@ -27834,7 +27875,8 @@ arm_expand_epilogue (bool really_return)
           && really_return
           && crtl->args.pretend_args_size == 0
           && saved_regs_mask & (1 << LR_REGNUM)
-          && !crtl->calls_eh_return)
+          && !crtl->calls_eh_return
+	  && !arm_current_function_pac_enabled_p ())
         {
           saved_regs_mask &= ~(1 << LR_REGNUM);
           saved_regs_mask |= (1 << PC_REGNUM);
@@ -27948,6 +27990,9 @@ arm_expand_epilogue (bool really_return)
 	}
     }
 
+  if (arm_current_function_pac_enabled_p ())
+    emit_insn (gen_aut_nop ());
+
   if (!really_return)
     return;
 
@@ -33049,6 +33094,22 @@ arm_fusion_enabled_p (tune_params::fuse_ops op)
   return current_tune->fusible_ops & op;
 }
 
+/* Return TRUE if return address signing mechanism is enabled.  */
+bool
+arm_current_function_pac_enabled_p (void)
+{
+  return (aarch_ra_sign_scope == AARCH_FUNCTION_ALL
+          || (aarch_ra_sign_scope == AARCH_FUNCTION_NON_LEAF
+              && !crtl->is_leaf));
+}
+
+/* Return TRUE if Branch Target Identification Mechanism is enabled.  */
+static bool
+aarch_bti_enabled ()
+{
+  return false;
+}
+
 /* Implement TARGET_SCHED_CAN_SPECULATE_INSN.  Return true if INSN can be
    scheduled for speculative execution.  Reject the long-running division
    and square-root instructions.  */
diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h
index ff8452ea04a..5f7c40805d3 100644
--- a/gcc/config/arm/arm.h
+++ b/gcc/config/arm/arm.h
@@ -506,6 +506,10 @@ extern int arm_arch8_3;
 /* Nonzero if this chip supports the ARM Architecture 8.4 extensions.  */
 extern int arm_arch8_4;
 
+/* Nonzero if this chip supports the ARM Architecture 8-M Mainline
+   extensions.  */
+extern int arm_arch8m_main;
+
 /* Nonzero if this chip supports the ARM Architecture 8.1-M Mainline
    extensions.  */
 extern int arm_arch8_1m_main;
diff --git a/gcc/config/arm/arm.md b/gcc/config/arm/arm.md
index 69bf343fb0e..d624cfae5b8 100644
--- a/gcc/config/arm/arm.md
+++ b/gcc/config/arm/arm.md
@@ -12978,6 +12978,29 @@ (define_insn "*speculation_barrier_insn"
    (set_attr "length" "8")]
 )
 
+(define_insn "pac_nop"
+  [(set (reg:SI IP_REGNUM)
+	(unspec:SI [(reg:SI SP_REGNUM) (reg:SI LR_REGNUM)]
+		   UNSPEC_PAC_NOP))]
+  "arm_arch8m_main"
+  "pac\t%|ip, %|lr, %|sp"
+  [(set_attr "conds" "unconditional")])
+
+(define_insn "pacbti_nop"
+  [(set (reg:SI IP_REGNUM)
+	(unspec_volatile:SI [(reg:SI SP_REGNUM) (reg:SI LR_REGNUM)]
+			    VUNSPEC_PACBTI_NOP))]
+  "arm_arch8m_main"
+  "pacbti\t%|ip, %|lr, %|sp"
+  [(set_attr "conds" "unconditional")])
+
+(define_insn "aut_nop"
+  [(unspec_volatile:SI [(reg:SI IP_REGNUM) (reg:SI SP_REGNUM) (reg:SI LR_REGNUM)]
+		       VUNSPEC_AUT_NOP)]
+  "arm_arch8m_main"
+  "aut\t%|ip, %|lr, %|sp"
+  [(set_attr "conds" "unconditional")])
+
 ;; Vector bits common to IWMMXT, Neon and MVE
 (include "vec-common.md")
 ;; Load the Intel Wireless Multimedia Extension patterns
diff --git a/gcc/config/arm/unspecs.md b/gcc/config/arm/unspecs.md
index 7748e784379..370f0b12da1 100644
--- a/gcc/config/arm/unspecs.md
+++ b/gcc/config/arm/unspecs.md
@@ -159,6 +159,7 @@ (define_c_enum "unspec" [
   UNSPEC_VCDE		; Custom Datapath Extension instruction.
   UNSPEC_VCDEA		; Custom Datapath Extension instruction.
   UNSPEC_DLS		; Used for DLS (Do Loop Start), Armv8.1-M Mainline instruction
+  UNSPEC_PAC_NOP	; Represents PAC signing LR
 ])
 
 
@@ -254,6 +255,8 @@ (define_c_enum "unspecv" [
 			; instruction.
   VUNSPEC_VLLDM		; Represent the lazy load multiple with vlldm
 			; instruction.
+  VUNSPEC_PACBTI_NOP	; Represents PAC signing LR + valid landing pad
+  VUNSPEC_AUT_NOP	; Represents PAC verifying LR
 ])
 
 ;; Enumerators for NEON unspecs.
diff --git a/gcc/testsuite/gcc.target/arm/pac-1.c b/gcc/testsuite/gcc.target/arm/pac-1.c
new file mode 100644
index 00000000000..9b26f62b65f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pac-1.c
@@ -0,0 +1,11 @@
+/* Testing return address signing.  */
+/* { dg-do run } */
+/* { dg-require-effective-target mbranch_protection_ok } */
+/* { dg-require-effective-target arm_pacbti_hw } */
+/* { dg-options "-march=armv8.1-m.main+pacbti+fp -mbranch-protection=pac-ret+leaf -mthumb -mfloat-abi=hard --save-temps -O0" } */
+
+#include "pac.h"
+
+/* { dg-final { scan-assembler-times "pac\tip, lr, sp" 2 } } */
+/* { dg-final { scan-assembler-times "aut\tip, lr, sp" 2 } } */
+/* { dg-final { scan-assembler-not "\tbti" } } */
diff --git a/gcc/testsuite/gcc.target/arm/pac-10.c b/gcc/testsuite/gcc.target/arm/pac-10.c
new file mode 100644
index 00000000000..a794195e8f6
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pac-10.c
@@ -0,0 +1,10 @@
+/* Testing return address signing.  */
+/* { dg-do compile } */
+/* { dg-require-effective-target mbranch_protection_ok } */
+/* { dg-options "-march=armv8.1-m.main+pacbti+fp -mbranch-protection=pac-ret -mthumb -mfloat-abi=hard --save-temps -O0" } */
+
+#include "pac.h"
+
+/* { dg-final { scan-assembler "pac\tip, lr, sp" } } */
+/* { dg-final { scan-assembler "aut\tip, lr, sp" } } */
+/* { dg-final { scan-assembler-not "\tbti" } } */
diff --git a/gcc/testsuite/gcc.target/arm/pac-11.c b/gcc/testsuite/gcc.target/arm/pac-11.c
new file mode 100644
index 00000000000..37ffc93b41b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pac-11.c
@@ -0,0 +1,10 @@
+/* Testing return address signing.  */
+/* { dg-do compile } */
+/* { dg-require-effective-target mbranch_protection_ok } */
+/* { dg-options "-march=armv8.1-m.main+pacbti+fp -mbranch-protection=bti+pac-ret+leaf -mthumb -mfloat-abi=hard --save-temps -O2" } */
+
+#include "pac.h"
+
+/* { dg-final { scan-assembler-times "pacbti\tip, lr, sp" 2 } } */
+/* { dg-final { scan-assembler-times "aut\tip, lr, sp" 2 } } */
+/* { dg-final { scan-assembler-not "\tbti" } } */
diff --git a/gcc/testsuite/gcc.target/arm/pac-2.c b/gcc/testsuite/gcc.target/arm/pac-2.c
new file mode 100644
index 00000000000..945ce938592
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pac-2.c
@@ -0,0 +1,11 @@
+/* Testing return address signing.  */
+/* { dg-do run } */
+/* { dg-require-effective-target mbranch_protection_ok } */
+/* { dg-require-effective-target arm_pacbti_hw } */
+/* { dg-options "-march=armv8.1-m.main+pacbti+fp -mbranch-protection=pac-ret -mthumb -mfloat-abi=hard --save-temps -O0" } */
+
+#include "pac.h"
+
+/* { dg-final { scan-assembler "pac\tip, lr, sp" } } */
+/* { dg-final { scan-assembler "aut\tip, lr, sp" } } */
+/* { dg-final { scan-assembler-not "\tbti" } } */
diff --git a/gcc/testsuite/gcc.target/arm/pac-3.c b/gcc/testsuite/gcc.target/arm/pac-3.c
new file mode 100644
index 00000000000..47e290a5840
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pac-3.c
@@ -0,0 +1,11 @@
+/* Testing return address signing.  */
+/* { dg-do run } */
+/* { dg-require-effective-target mbranch_protection_ok } */
+/* { dg-require-effective-target arm_pacbti_hw } */
+/* { dg-options "-march=armv8.1-m.main+pacbti+fp -mbranch-protection=bti+pac-ret+leaf -mthumb -mfloat-abi=hard --save-temps -O2" } */
+
+#include "pac.h"
+
+/* { dg-final { scan-assembler-times "pacbti\tip, lr, sp" 2 } } */
+/* { dg-final { scan-assembler-times "aut\tip, lr, sp" 2 } } */
+/* { dg-final { scan-assembler-not "\tbti" } } */
diff --git a/gcc/testsuite/gcc.target/arm/pac-4.c b/gcc/testsuite/gcc.target/arm/pac-4.c
new file mode 100644
index 00000000000..cf915cdba50
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pac-4.c
@@ -0,0 +1,10 @@
+/* Testing return address signing.  */
+/* { dg-do compile } */
+/* { dg-require-effective-target mbranch_protection_ok } */
+/* { dg-options "-march=armv8.1-m.main+pacbti+fp -mthumb -mfloat-abi=hard --save-temps -O2" } */
+
+#include "pac.h"
+
+/* { dg-final { scan-assembler-not "\tbti\t" } } */
+/* { dg-final { scan-assembler-not "\tpac\t" } } */
+/* { dg-final { scan-assembler-not "\tpacbti\t" } } */
diff --git a/gcc/testsuite/gcc.target/arm/pac-5.c b/gcc/testsuite/gcc.target/arm/pac-5.c
new file mode 100644
index 00000000000..c70087eb6b6
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pac-5.c
@@ -0,0 +1,28 @@
+/* Testing return address signing.  */
+/* { dg-do run } */
+/* { dg-require-effective-target mbranch_protection_ok } */
+/* { dg-require-effective-target arm_pacbti_hw } */
+/* { dg-options "-march=armv8.1-m.main+pacbti+fp -mbranch-protection=pac-ret+leaf -mthumb -mfloat-abi=hard --save-temps -O0" } */
+
+#include <stdlib.h>
+
+int
+__attribute__((noinline))
+foo1 (int a, int b)
+{
+  int square (int z) { return z * z; }
+  return square (a) + square (b);
+}
+
+int
+main (void)
+{
+  if (foo1 (1, 2) != 5)
+    abort ();
+
+  return 0;
+}
+
+/* { dg-final { scan-assembler-times "pac\tip, lr, sp" 3 } } */
+/* { dg-final { scan-assembler-times "aut\tip, lr, sp" 3 } } */
+/* { dg-final { scan-assembler-not "\tbti" } } */
diff --git a/gcc/testsuite/gcc.target/arm/pac-6.c b/gcc/testsuite/gcc.target/arm/pac-6.c
new file mode 100644
index 00000000000..c5329f0ef48
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pac-6.c
@@ -0,0 +1,18 @@
+/* Check that GCC does .save and .cfi_offset directives with RA_AUTH_CODE pseudo hard-register.  */
+/* { dg-do compile } */
+/* { dg-require-effective-target mbranch_protection_ok } */
+/* { dg-options "-march=armv8.1-m.main+fp -mbranch-protection=pac-ret+leaf -mthumb --save-temps -O0 -g" } */
+
+int i;
+
+void foo (int);
+
+int bar()
+{
+  foo (i);
+  return 0;
+}
+
+/* { dg-final { scan-assembler "pac\tip, lr, sp" } } */
+/* { dg-final { scan-assembler "aut\tip, lr, sp" } } */
+/* { dg-final { scan-assembler-not "bti" } } */
diff --git a/gcc/testsuite/gcc.target/arm/pac-7.c b/gcc/testsuite/gcc.target/arm/pac-7.c
new file mode 100644
index 00000000000..cdaebca5cfa
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pac-7.c
@@ -0,0 +1,32 @@
+/* Testing return address signing.  */
+/* { dg-do run } */
+/* { dg-require-effective-target mbranch_protection_ok } */
+/* { dg-require-effective-target arm_pacbti_hw } */
+/* { dg-options "-march=armv8.1-m.main+pacbti+fp -mbranch-protection=pac-ret+leaf -mthumb -mfloat-abi=hard --save-temps -O0" } */
+
+#include <stdlib.h>
+
+int
+__attribute__((noinline))
+foo1 (int a, int b)
+{
+  int x = 4;
+  int foo2 (int a, int b)
+  {
+    return a + b + x;
+  }
+  return foo2 (a, b);
+}
+
+int
+main (void)
+{
+  if (foo1 (1, 2) != 7)
+    abort ();
+
+  return 0;
+}
+
+/* { dg-final { scan-assembler-times "pac\tip, lr, sp" 3 } } */
+/* { dg-final { scan-assembler-times "aut\tip, lr, sp" 3 } } */
+/* { dg-final { scan-assembler-not "\tbti" } } */
diff --git a/gcc/testsuite/gcc.target/arm/pac-8.c b/gcc/testsuite/gcc.target/arm/pac-8.c
new file mode 100644
index 00000000000..3f37dcfa5c8
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pac-8.c
@@ -0,0 +1,34 @@
+/* Testing return address signing.  */
+/* { dg-do run } */
+/* { dg-require-effective-target mbranch_protection_ok } */
+/* { dg-require-effective-target arm_pacbti_hw } */
+/* { dg-options "-march=armv8.1-m.main+pacbti+fp -mbranch-protection=pac-ret+leaf -mthumb -mfloat-abi=hard --save-temps -O0" } */
+
+#include <stdarg.h>
+#include <stdlib.h>
+
+int acc (int n, ...)
+{
+    int sum = 0;
+    va_list ptr;
+
+    va_start (ptr, n);
+
+    for (int i = 0; i < n; i++)
+        sum += va_arg (ptr, int);
+    va_end (ptr);
+
+    return sum;
+}
+
+int main()
+{
+  if (acc (3, 1, 2, 3) != 6)
+    abort ();
+
+  return 0;
+}
+
+/* { dg-final { scan-assembler-times "pac\tip, lr, sp" 2 } } */
+/* { dg-final { scan-assembler-times "aut\tip, lr, sp" 2 } } */
+/* { dg-final { scan-assembler-not "\tbti" } } */
diff --git a/gcc/testsuite/gcc.target/arm/pac-9.c b/gcc/testsuite/gcc.target/arm/pac-9.c
new file mode 100644
index 00000000000..ee2fad290b5
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pac-9.c
@@ -0,0 +1,11 @@
+/* Testing return address signing.  */
+/* { dg-do compile } */
+/* { dg-require-effective-target mbranch_protection_ok } */
+/* { dg-options "-march=armv8.1-m.main+pacbti+fp -mbranch-protection=pac-ret+leaf -mthumb -mfloat-abi=hard --save-temps -O0" } */
+
+#include "pac.h"
+
+/* { dg-final { scan-assembler-times "pac\tip, lr, sp" 2 } } */
+/* { dg-final { scan-assembler-times "aut\tip, lr, sp" 2 } } */
+/* { dg-final { scan-assembler-not "\tbti" } } */
+
diff --git a/gcc/testsuite/gcc.target/arm/pac.h b/gcc/testsuite/gcc.target/arm/pac.h
new file mode 100644
index 00000000000..7355e6b2954
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pac.h
@@ -0,0 +1,17 @@
+#include <stdlib.h>
+
+int
+__attribute__((noinline))
+foo1 (int a, int b)
+{
+  return a + b;
+}
+
+int
+main (void)
+{
+  if (foo1 (1, 2) != 3)
+    abort ();
+
+  return 0;
+}
-- 
2.25.1


  reply	other threads:[~2023-01-11  9:59 UTC|newest]

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-12 14:26 [PATCH 0/15] arm: Enables return address verification and branch target identification on Cortex-M Andrea Corallo
2022-08-12 15:14 ` [PATCH 1/15] arm: Make mbranch-protection opts parsing common to AArch32/64 Andrea Corallo
2022-12-22 17:04   ` [PATCH 1/15 V2] " Andrea Corallo
2023-01-11 10:48     ` Richard Earnshaw
2022-08-12 15:15 ` [PATCH 2/15] arm: Add Armv8.1-M Mainline target feature +pacbti Andrea Corallo
2022-08-12 15:21 ` [PATCH 3/15] arm: Add option -mbranch-protection Andrea Corallo
2022-08-12 15:22 ` [PATCH 4/15] arm: Add testsuite library support for PACBTI target Andrea Corallo
2022-08-12 15:26 ` [PATCH 5/15] arm: Implement target feature macros for PACBTI Andrea Corallo
2022-08-12 15:29 ` [PATCH 6/15] arm: Add pointer authentication for stack-unwinding runtime Andrea Corallo
2022-08-12 15:30 ` [PATCH 7/15] arm: Emit build attributes for PACBTI target feature Andrea Corallo
2022-09-05 16:53   ` Andrea Corallo
2022-10-20 14:47   ` Kyrylo Tkachov
2022-10-20 15:15     ` Richard Earnshaw
2022-10-21 12:19   ` Richard Earnshaw
2022-08-12 15:33 ` [PATCH 8/15] arm: Introduce multilibs " Andrea Corallo
2022-08-12 15:34 ` [PATCH 9/15] arm: Set again stack pointer as CFA reg when popping if necessary Andrea Corallo
2022-09-05 16:52   ` Andrea Corallo
2022-09-27  9:03   ` Kyrylo Tkachov
2022-09-27 10:05     ` Andrea Corallo
2022-09-27 15:24       ` Kyrylo Tkachov
2022-10-21 12:30         ` Richard Earnshaw
2022-10-26  8:49           ` Andrea Corallo
2022-11-08 14:57             ` Richard Earnshaw
2023-01-09 14:58             ` Andrea Corallo
2023-01-09 15:57               ` Richard Earnshaw
2023-01-09 16:48               ` Richard Earnshaw
2023-01-09 17:22                 ` Richard Earnshaw
2023-01-11  9:55                   ` Andrea Corallo
2022-08-12 15:36 ` [PATCH 10/15] arm: Implement cortex-M return signing address codegen Andrea Corallo
2022-09-05 16:55   ` Andrea Corallo
2022-09-14 14:20   ` [PATCH 10/15 V2] " Andrea Corallo
2022-10-21 12:58     ` Richard Earnshaw
2022-10-26 15:48       ` Andrea Corallo
2022-10-28 16:34         ` [PATCH 10/15 V3] " Andrea Corallo
2022-11-07  8:57           ` [PATCH 10/15 V4] " Andrea Corallo
2022-12-05 16:38             ` Richard Earnshaw
2022-12-09 14:16               ` [PATCH 10/15 V5] " Andrea Corallo
2022-12-12 10:53                 ` Richard Earnshaw
2022-12-14 16:35                   ` [PATCH 10/15 V6] " Andrea Corallo
2022-12-14 16:45                     ` Richard Earnshaw
2023-01-11  9:58                       ` Andrea Corallo [this message]
2023-01-11 10:39                         ` [PATCH 10/15 V7] " Richard Earnshaw
2022-08-12 15:40 ` [PATCH 11/15] aarch64: Make bti pass generic so it can be used by the arm backend Andrea Corallo
2022-09-05 16:56   ` Andrea Corallo
2022-09-27  9:10   ` Kyrylo Tkachov
2022-08-12 15:41 ` [PATCH 12/15] arm: implement bti injection Andrea Corallo
2022-09-05 16:56   ` Andrea Corallo
2022-09-27  9:18   ` Kyrylo Tkachov
2022-09-29 15:45     ` [PATCH 12/15 V2] " Andrea Corallo
2022-10-20 14:56       ` Kyrylo Tkachov
2022-10-28 16:40         ` [PATCH 12/15 V3] " Andrea Corallo
2022-12-05 17:02           ` Richard Earnshaw
2022-12-14 16:40             ` [PATCH 12/15 V4] " Andrea Corallo
2022-12-14 17:00               ` Richard Earnshaw
2022-12-14 17:03                 ` Richard Earnshaw
2022-12-22 17:13                   ` [PATCH 12/15 V5] " Andrea Corallo
2023-01-11 15:08                     ` Richard Earnshaw
2022-08-12 16:44 ` [PATCH 0/15] arm: Enables return address verification and branch target identification on Cortex-M Andrea Corallo
2022-08-12 17:10 ` [PATCH 13/15] arm: Add pacbti related multilib support for armv8.1-m.main Srinath Parvathaneni
2022-10-21 13:00   ` Richard Earnshaw
2022-09-21  8:07 ` [PING][PATCH 0/15] arm: Enables return address verification and branch target identification on Cortex-M Andrea Corallo
2022-10-21 13:01   ` Richard Earnshaw
2022-10-21 13:32     ` Andrea Corallo
2022-12-05 14:10   ` Andrea Corallo
2022-12-05 14:19     ` Kyrylo Tkachov
2023-01-23 10:50   ` [PATCH " Andrea Corallo

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