libc/arm: add missing .cfi_sections

The modifications added by the series "M-profile PACBTI-enablement"
(see 9d6b00511e50a54d2472d11f75f7c0f2b4a98b24) have introduced a couple
of .cfi_* instructions.

Like for e6459123e497409a9e3d845c39829a9602ba55a4, these instructions
create object files which contain .eh_frame sections.  However, ARM uses
its own unwind info format, not .eh_frame, which is generated by
ARM-specific directives, not .cfi_*. The .eh_frame sections are useless,
but also not removed by strip and may be harmful with some linker
scripts.

Adding ".cfi_sections .debug_frame" (as in glibc) moves the generated
directives towards .debug_frame instead of .eh_frame. Making them easier
to handle.

            * libc/machine/arm/aeabi_memmove-thumb2.S: Use .cfi_sections
            .debug_frame.
            * libc/machine/arm/aeabi_memset-thumb2.S: Likewise.
            * libc/machine/arm/memchr.S: Likewise.
            * libc/machine/arm/memcpy-armv7m.S: Likewise.
            * libc/machine/arm/setjmp.S: Likewise.
            * libc/machine/arm/strlen-armv7.S: Likewise.
            * libc/machine/arm/strlen-thumb2-Os.S: Likewise.

diff --git a/newlib/libc/machine/arm/aeabi_memmove-thumb2.S b/newlib/libc/machine/arm/aeabi_memmove-thumb2.S
index 20ca993e56651796ef515ed646776bc58bdb69cd..3018e74126925277d4bbaff7ff7c4144ef2522c8 100644 (file)
--- a/newlib/libc/machine/arm/aeabi_memmove-thumb2.S
+++ b/newlib/libc/machine/arm/aeabi_memmove-thumb2.S
@@ -36,6 +36,7 @@
        ASM_ALIAS __aeabi_memmove8 __aeabi_memmove
 __aeabi_memmove:
        .fnstart
+       .cfi_sections .debug_frame
        .cfi_startproc
        prologue 4
        cmp     r0, r1

diff --git a/newlib/libc/machine/arm/aeabi_memset-thumb2.S b/newlib/libc/machine/arm/aeabi_memset-thumb2.S
index 6b77d3820eef22bb256b59bf4cbd0da9a72c1dd9..a1b8f053229cf8ec2b6132253b90948c0f43c870 100644 (file)
--- a/newlib/libc/machine/arm/aeabi_memset-thumb2.S
+++ b/newlib/libc/machine/arm/aeabi_memset-thumb2.S
@@ -33,6 +33,7 @@
        .global __aeabi_memset
        .type   __aeabi_memset, %function
        .fnstart
+       .cfi_sections .debug_frame
        .cfi_startproc
        ASM_ALIAS __aeabi_memset4 __aeabi_memset
        ASM_ALIAS __aeabi_memset8 __aeabi_memset

diff --git a/newlib/libc/machine/arm/memchr.S b/newlib/libc/machine/arm/memchr.S
index d13ef8d65454a1e493b74333071b4875577d214b..f0b3650aa336214e88dbe1617e9e8178f152c028 100644 (file)
--- a/newlib/libc/machine/arm/memchr.S
+++ b/newlib/libc/machine/arm/memchr.S
@@ -293,6 +293,7 @@ memchr:
        .global memchr
        .type memchr,%function
        .fnstart
+       .cfi_sections .debug_frame
        .cfi_startproc
 memchr:
        @ r0 = start of memory to scan

diff --git a/newlib/libc/machine/arm/memcpy-armv7m.S b/newlib/libc/machine/arm/memcpy-armv7m.S
index ec1ad6485e582592ed578024e7a3d8959f99ab1d..13ffdb343f013d6fdbda51319a2b26c59ad9df36 100644 (file)
--- a/newlib/libc/machine/arm/memcpy-armv7m.S
+++ b/newlib/libc/machine/arm/memcpy-armv7m.S
@@ -88,6 +88,7 @@
        .thumb
        .thumb_func
        .fnstart
+       .cfi_sections .debug_frame
        .cfi_startproc
        .type   memcpy, %function
 memcpy:

diff --git a/newlib/libc/machine/arm/setjmp.S b/newlib/libc/machine/arm/setjmp.S
index 5e5952296c9daa0197b74e157a9068ef9d115cc8..0070f17cdcef9e1b70aeded257019a55d61f035e 100644 (file)
--- a/newlib/libc/machine/arm/setjmp.S
+++ b/newlib/libc/machine/arm/setjmp.S
@@ -183,6 +183,7 @@ SYM (.arm_start_of.\name):
        MODE
        .globl SYM (\name)
        .fnstart
+       .cfi_sections .debug_frame
        .cfi_startproc
        TYPE (\name)
 SYM (\name):

diff --git a/newlib/libc/machine/arm/strlen-armv7.S b/newlib/libc/machine/arm/strlen-armv7.S
index 6aa122c075bbd395c1c1b53925b0a28c3be7294e..1c2b5c532bb4a6392159b4284cfe48d318e19b62 100644 (file)
--- a/newlib/libc/machine/arm/strlen-armv7.S
+++ b/newlib/libc/machine/arm/strlen-armv7.S
@@ -106,6 +106,7 @@
 
 def_fn strlen p2align=6
        .fnstart
+       .cfi_sections .debug_frame
        .cfi_startproc
        prologue 4 5 push_ip=HAVE_PAC_LEAF
        pld     [srcin, #0]

diff --git a/newlib/libc/machine/arm/strlen-thumb2-Os.S b/newlib/libc/machine/arm/strlen-thumb2-Os.S
index 4adbc61d2e032ca7593db6b39e938202058583ba..b8a615a15d8fb0cf4221fbe439f8989e277f201a 100644 (file)
--- a/newlib/libc/machine/arm/strlen-thumb2-Os.S
+++ b/newlib/libc/machine/arm/strlen-thumb2-Os.S
@@ -47,6 +47,7 @@
 
 def_fn strlen p2align=1
        .fnstart
+       .cfi_sections .debug_frame
        .cfi_startproc
        prologue
        mov     r3, r0