From: Victor Do Nascimento <victor.donascimento@arm.com>
To: <newlib@sourceware.org>
Cc: <richard.earnshaw@arm.com>,
Victor Do Nascimento <victor.donascimento@arm.com>
Subject: [PATCH v2 6/8] newlib: libc: setjmp/longjmp M-profile PACBTI-enablement
Date: Wed, 3 Aug 2022 16:35:22 +0100 [thread overview]
Message-ID: <20220803153524.20631-7-victor.donascimento@arm.com> (raw)
In-Reply-To: <20220803153524.20631-1-victor.donascimento@arm.com>
Add function prologue/epilogue to conditionally add BTI landing pads
and/or PAC code generation & authentication instructions depending on
compilation flags.
---
newlib/libc/machine/arm/setjmp.S | 33 ++++++++++++++++++++++++++++++--
1 file changed, 31 insertions(+), 2 deletions(-)
diff --git a/newlib/libc/machine/arm/setjmp.S b/newlib/libc/machine/arm/setjmp.S
index 21d6ff9e7..d60dd57df 100644
--- a/newlib/libc/machine/arm/setjmp.S
+++ b/newlib/libc/machine/arm/setjmp.S
@@ -157,11 +157,15 @@ SYM (.arm_start_of.\name):
.globl SYM (\name)
TYPE (\name)
SYM (\name):
+ .fnstart
+ .cfi_startproc
PROLOGUE \name
.endm
.macro FUNC_END name
RET
+ .cfi_endproc
+ .fnend
SIZE (\name)
.endm
@@ -173,11 +177,26 @@ SYM (\name):
/* Save all the callee-preserved registers into the jump buffer. */
#ifdef __thumb2__
+#if __ARM_FEATURE_PAC_DEFAULT
+#if __ARM_FEATURE_BTI_DEFAULT
+ pacbti ip, lr, sp
+#else
+ pac ip, lr, sp
+#endif /* __ARM_FEATURE_BTI_DEFAULT */
+ .cfi_register 143, 12
+ mov a4, ip
+ mov ip, sp
+ stmea a1!, { a4, v1-v7, fp, ip, lr }
+#else
+#if __ARM_FEATURE_BTI_DEFAULT
+ bti
+#endif /* __ARM_FEATURE_BTI_DEFAULT */
mov ip, sp
stmea a1!, { v1-v7, fp, ip, lr }
+#endif /* __ARM_FEATURE_PAC_DEFAULT */
#else
stmea a1!, { v1-v7, fp, ip, sp, lr }
-#endif
+#endif /* __thumb2__ */
#if 0 /* Simulator does not cope with FP instructions yet. */
#ifndef __SOFTFP__
@@ -200,11 +219,17 @@ SYM (\name):
/* Restore the registers, retrieving the state when setjmp() was called. */
#ifdef __thumb2__
+#if __ARM_FEATURE_PAC_DEFAULT
+ ldmfd a1!, { a4, v1-v7, fp, ip, lr }
+ mov sp, ip
+ mov ip, a4
+#else
ldmfd a1!, { v1-v7, fp, ip, lr }
mov sp, ip
+#endif /* __ARM_FEATURE_PAC_DEFAULT */
#else
ldmfd a1!, { v1-v7, fp, ip, sp, lr }
-#endif
+#endif /* __thumb2__ */
#if 0 /* Simulator does not cope with FP instructions yet. */
#ifndef __SOFTFP__
@@ -220,5 +245,9 @@ SYM (\name):
#endif
moveq a1, #1
+#if __ARM_FEATURE_PAC_DEFAULT
+ aut ip, lr, sp
+#endif
+
FUNC_END longjmp
#endif
--
2.36.1
next prev parent reply other threads:[~2022-08-03 15:35 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-03 15:35 [PATCH v2 0/8] Implement assembly cortex-M PACBTI functionality Victor Do Nascimento
2022-08-03 15:35 ` [PATCH v2 1/8] newlib: libc: define M-profile PACBTI-enablement macros Victor Do Nascimento
2022-08-04 15:19 ` Richard Earnshaw
2022-08-05 9:21 ` Victor L. Do Nascimento
2022-08-16 16:11 ` Victor L. Do Nascimento
2022-08-18 16:28 ` Victor L. Do Nascimento
2022-08-03 15:35 ` [PATCH v2 2/8] newlib: libc: strcmp M-profile PACBTI-enablement Victor Do Nascimento
2022-08-04 15:48 ` Richard Earnshaw
2022-08-05 10:51 ` Victor L. Do Nascimento
2022-08-05 14:34 ` Richard Earnshaw
2022-08-05 14:58 ` Victor L. Do Nascimento
2022-08-05 15:15 ` Richard Earnshaw
2022-08-03 15:35 ` [PATCH v2 3/8] newlib: libc: strlen " Victor Do Nascimento
2022-08-03 15:35 ` [PATCH v2 4/8] newlib: libc: memchr " Victor Do Nascimento
2022-08-03 15:35 ` [PATCH v2 5/8] newlib: libc: memcpy " Victor Do Nascimento
2022-08-03 15:35 ` Victor Do Nascimento [this message]
2022-08-03 15:35 ` [PATCH v2 7/8] newlib: libc: aeabi_memmove " Victor Do Nascimento
2022-08-03 15:35 ` [PATCH v2 8/8] newlib: libc: aeabi_memset " Victor Do Nascimento
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220803153524.20631-7-victor.donascimento@arm.com \
--to=victor.donascimento@arm.com \
--cc=newlib@sourceware.org \
--cc=richard.earnshaw@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).