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libgcc: use .init_stack for constructors if available 

* config/i386/morestack.S: Use .init_array for constructor if
	available.
	* config/rs6000/morestack.S: Likewise.
	* config/s390/morestack.S: Likewise.
This commit is contained in:
Ian Lance Taylor 2021-10-07 20:22:25 -07:00
parent 613196462a
commit f49e3d28be
3 changed files with 21 additions and 4 deletions
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13
libgcc/config/i386/morestack.S
View File

@ -23,6 +23,7 @@
# see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
# <http://www.gnu.org/licenses/>.
#include "auto-host.h"
# Support for allocating more stack space when using -fsplit-stack.
# When a function discovers that it needs more stack space, it will
@ -75,7 +76,7 @@
# The amount of extra space we ask for. In general this has to be
# enough for the dynamic loader to find a symbol and for a signal
# handler to run.
#ifndef __x86_64__
#define BACKOFF (1024)
#else
@ -160,7 +161,7 @@ __morestack_non_split:
cmpb $0x55,1(%eax)
je 2f
3:
3:
movl %eax,4(%esp) # Update return address.
popl %eax # Restore %eax and stack.
@ -426,7 +427,7 @@ __morestack:
# This is the cleanup code called by the stack unwinder when unwinding
# through the code between .LEHB0 and .LEHE0 above.
.L1:
.cfi_restore_state
subl $16,%esp # Maintain 16 byte alignment.
@ -600,7 +601,7 @@ __morestack:
# This is the cleanup code called by the stack unwinder when unwinding
# through the code between .LEHB0 and .LEHE0 above.
.L1:
.cfi_restore_state
subq $16,%rsp # Maintain 16 byte alignment.
@ -848,7 +849,11 @@ __morestack_make_guard:
# Make __stack_split_initialize a high priority constructor. FIXME:
# This is ELF specific.
#if HAVE_INITFINI_ARRAY_SUPPORT
.section .init_array.00000,"aw",@progbits
#else
.section .ctors.65535,"aw",@progbits
#endif
#ifndef __LP64__
.align 4

6
libgcc/config/rs6000/morestack.S
View File

@ -24,6 +24,8 @@
# see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
# <http://www.gnu.org/licenses/>.
#include <auto-host.h>
#if _CALL_ELF == 2
.abiversion 2
#define PARAMS 32
@ -396,7 +398,11 @@ ENTRY0(__morestack_make_guard)
# Make __stack_split_initialize a high priority constructor.
#if HAVE_INITFINI_ARRAY_SUPPORT
.section .init_array.00000,"aw",@progbits
#else
.section .ctors.65535,"aw",@progbits
#endif
.p2align 3
.quad __stack_split_initialize
.quad __morestack_load_mmap

6
libgcc/config/s390/morestack.S
View File

@ -28,6 +28,8 @@
# also cover signal frame size.
#define BACKOFF 0x1000
#include <auto-host.h>
# The __morestack function.
.global __morestack
@ -594,7 +596,11 @@ __morestack_make_guard:
# Make __stack_split_initialize a high priority constructor.
#if HAVE_INITFINI_ARRAY_SUPPORT
.section .init_array.00000,"aw",@progbits
#else
.section .ctors.65535,"aw",@progbits
#endif
#ifndef __LP64__
.align 4