* [PATCH v2][Binutils][GAS] arm: Add cfi expression support for ra_auth_code
@ 2022-08-01 14:18 Victor Do Nascimento
2022-08-02 9:36 ` Nick Clifton
0 siblings, 1 reply; 2+ messages in thread
From: Victor Do Nascimento @ 2022-08-01 14:18 UTC (permalink / raw)
To: binutils; +Cc: richard.earnshaw, Victor Do Nascimento
Hi all,
This patch extends assembler support for the use of register names
to allow for pseudo-registers, e.g. ra_auth_code register.
This is done particularly with CFI directives in mind, allowing for
expressions of the type:
.cfi_register ra_auth_code, 12
Tested for arm-none-eabi.
Thanks,
Victor.
gas/Changelog:
* config/tc-arm.c (tc_arm_regname_to_dw2regnum): Add
REG_TYPE_PSEUDO handling.
* testsuite/gas/arm/cfi-pacbti-m-readelf.d: New.
* testsuite/gas/arm/cfi-pacbti-m.s: New.
---
gas/config/tc-arm.c | 4 +++
gas/testsuite/gas/arm/cfi-pacbti-m-readelf.d | 31 ++++++++++++++++++++
gas/testsuite/gas/arm/cfi-pacbti-m.s | 22 ++++++++++++++
3 files changed, 57 insertions(+)
create mode 100644 gas/testsuite/gas/arm/cfi-pacbti-m-readelf.d
create mode 100644 gas/testsuite/gas/arm/cfi-pacbti-m.s
diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index e28085310c8..fed70e334b6 100644
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -27933,6 +27933,10 @@ tc_arm_regname_to_dw2regnum (char *regname)
if (reg != FAIL)
return reg + 256;
+ reg = arm_reg_parse (®name, REG_TYPE_PSEUDO);
+ if (reg != FAIL)
+ return reg;
+
return FAIL;
}
diff --git a/gas/testsuite/gas/arm/cfi-pacbti-m-readelf.d b/gas/testsuite/gas/arm/cfi-pacbti-m-readelf.d
new file mode 100644
index 00000000000..997ea75f179
--- /dev/null
+++ b/gas/testsuite/gas/arm/cfi-pacbti-m-readelf.d
@@ -0,0 +1,31 @@
+#readelf: -wf
+#source: cfi-pacbti-m.s
+#name: Call Frame information for Armv8.1-M.Mainline PACBTI extension
+# This test is only valid on ELF based ports.
+#notarget: *-*-pe *-*-wince
+# VxWorks needs a special variant of this file.
+#skip: *-*-vxworks*
+
+Contents of the .eh_frame section:
+
+
+00000000 00000010 00000000 CIE
+ Version: 1
+ Augmentation: "zR"
+ Code alignment factor: 2
+ Data alignment factor: -4
+ Return address column: 14
+ Augmentation data: 1b
+ DW_CFA_def_cfa: r13 ofs 0
+
+00000014 00000020 00000018 FDE cie=00000000 pc=00000000..0000000c
+ DW_CFA_advance_loc: 4 to 00000004
+ DW_CFA_register: r143 in r12
+ DW_CFA_advance_loc: 4 to 00000008
+ DW_CFA_def_cfa_offset: 8
+ DW_CFA_offset: r14 at cfa-8
+ DW_CFA_offset: r12 at cfa-4
+ DW_CFA_advance_loc: 4 to 0000000c
+ DW_CFA_restore_extended: r143
+ DW_CFA_restore: r14
+ DW_CFA_def_cfa_offset: 0
diff --git a/gas/testsuite/gas/arm/cfi-pacbti-m.s b/gas/testsuite/gas/arm/cfi-pacbti-m.s
new file mode 100644
index 00000000000..515400d86f5
--- /dev/null
+++ b/gas/testsuite/gas/arm/cfi-pacbti-m.s
@@ -0,0 +1,22 @@
+ .arch armv8.1-m.main
+ .arch_extension pacbti
+ .eabi_attribute Tag_PAC_extension, 2
+ .eabi_attribute Tag_BTI_extension, 2
+ .eabi_attribute Tag_BTI_use, 1
+ .eabi_attribute Tag_PACRET_use, 1
+ .syntax unified
+ .text
+ .thumb
+.Lstart:
+ .cfi_startproc
+ pacbti ip, lr, sp
+ .cfi_register ra_auth_code, ip
+ push {ip, lr}
+ .cfi_def_cfa_offset 8
+ .cfi_offset lr, -8
+ .cfi_offset ip, -4
+ pop {ip, lr}
+ .cfi_restore 143
+ .cfi_restore 14
+ .cfi_def_cfa_offset 0
+ .cfi_endproc
--
2.36.1
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH v2][Binutils][GAS] arm: Add cfi expression support for ra_auth_code
2022-08-01 14:18 [PATCH v2][Binutils][GAS] arm: Add cfi expression support for ra_auth_code Victor Do Nascimento
@ 2022-08-02 9:36 ` Nick Clifton
0 siblings, 0 replies; 2+ messages in thread
From: Nick Clifton @ 2022-08-02 9:36 UTC (permalink / raw)
To: Victor Do Nascimento, binutils; +Cc: richard.earnshaw
Hi Victor,
> gas/Changelog:
> * config/tc-arm.c (tc_arm_regname_to_dw2regnum): Add
> REG_TYPE_PSEUDO handling.
> * testsuite/gas/arm/cfi-pacbti-m-readelf.d: New.
> * testsuite/gas/arm/cfi-pacbti-m.s: New.
Approved - please apply.
Cheers
Nick
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2022-08-02 9:36 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-08-01 14:18 [PATCH v2][Binutils][GAS] arm: Add cfi expression support for ra_auth_code Victor Do Nascimento
2022-08-02 9:36 ` Nick Clifton
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).