glibc/sysdeps/unix/sysv/linux/sparc/Makefile

abi-variants := 32 64
abi-32-condition := __WORDSIZE == 32
abi-64-condition := __WORDSIZE == 64

ifeq ($(subdir),rt)
librt-routines += rt-sysdep
librt-shared-only-routines += rt-sysdep
endif

ifeq ($(subdir),sysvipc)
sysdep_routines += getshmlba
endif

ifeq ($(subdir),signal)
sysdep_routines += sigreturn_stub
endif
Convert WORDSIZE[32\|64]/ld entries to abi-variants 2012-05-26 17:46:59 +00:00			`abi-variants := 32 64`
			`abi-32-condition := __WORDSIZE == 32`
			`abi-64-condition := __WORDSIZE == 64`
* shlib-versions: Use sparc64.*- for CPU patterns. 2006-03-06 01:34:09 +00:00
			`ifeq ($(subdir),rt)`
			`librt-routines += rt-sysdep`
Do not override objects in libc.a in other static libraries [BZ #20452] With this change, we no longer add sysdep.o and similar objects which are present in libc.a to other static libraries. 2016-08-17 12:57:00 +00:00			`librt-shared-only-routines += rt-sysdep`
* shlib-versions: Use sparc64.*- for CPU patterns. 2006-03-06 01:34:09 +00:00			`endif`
Fix SHMLBA on sparc. [BZ #6471] * sysdeps/unix/sysv/linux/shmat.c (shmat): Test for syscall errors properly. * sysdeps/unix/sysv/linux/sparc/getshmlba.c: New file. * sysdeps/unix/sysv/linux/sparc/Makefile: Add getshmlba to sysdep_routines when subdir is sysvipc. * sysdeps/unix/sysv/linux/sparc/bits/shm.h (SHMLBA): Use new __getshmlba helper. 2012-03-17 02:28:51 +00:00
			`ifeq ($(subdir),sysvipc)`
			`sysdep_routines += getshmlba`
			`endif`
Move remaining SPARC code out of nptl/. 2014-06-21 00:13:47 +00:00
sparc: Move sigreturn stub to assembly It seems that some gcc versions might generates a stack frame for the sigreturn stub requires on sparc signal handling. For instance: $ cat test.c #define _GNU_SOURCE #include <sys/syscall.h> __attribute__ ((__optimize__ ("-fno-stack-protector"))) void __sigreturn_stub (void) { __asm__ ("mov %0, %%g1\n\t" "ta 0x10\n\t" : /* no outputs */ : "i" (SYS_rt_sigreturn)); } $ gcc -v [...] gcc version 9.2.1 20200224 (Debian 9.2.1-30) $ gcc -O2 -m64 test.c -S -o - [...] __sigreturn_stub: save %sp, -176, %sp #APP ! 9 "t.c" 1 mov 101, %g1 ta 0x10 ! 0 "" 2 #NO_APP .size __sigreturn_stub, .-__sigreturn_stub As indicated by kernel developers [1], the sigreturn stub can not change the register window or the stack pointer since the kernel has setup the restore frame at a precise location relative to the stack pointer when the stub is invoked. I tried to play with some compiler flags and even with _Noreturn and __builtin_unreachable after the asm does not help (and Sparc does not support naked functions). To avoid similar issues, as the stack-protector support also have stumbled, this patch moves the implementation of the sigreturn stubs to assembly. Checked on sparcv9-linux-gnu and sparc64-linux-gnu with gcc 9.2.1 and gcc 7.5.0. [1] https://lkml.org/lkml/2016/5/27/465 2020-03-05 16:38:24 +00:00			`ifeq ($(subdir),signal)`
			`sysdep_routines += sigreturn_stub`
			`endif`