[OLK-5.10] sw64:解决kselftest-sigaltstack测试FAIL

【环境信息】

硬件信息：

1)sw3231

软件信息：

1)os版本：uos1050d

2)内核版本：5.10

3)发现问题的测试用例：kselftest->sigaltstack->sas

【问题复现步骤】

1)现场复现步骤：

cd linux-stable-sw/tools/testing/selftests/
make -C ./ TARGETS=sigaltstack run_tests
2)复现概率：必错

【预期结果】

root@vm014:~/linux-stable-sw/tools/testing/selftests# make -C ./ TARGETS=sigaltstack run_tests
selftests: sigaltstack: sas
========================================
ok 1 Initial sigaltstack state was SS_DISABLE
# [RUN] signal USR1
ok 2 sigaltstack is disabled in sighandler
# [RUN] switched to user ctx
# [RUN] signal USR2
# [OK]  Stack preserved
ok 3 sigaltstack is still SS_AUTODISARM after signal
Pass 3 Fail 0 Xfail 0 Xpass 0 Skip 0 Error 0
1..3
ok 1..1 selftests: sigaltstack: sas [PASS]
【实际结果】

1.编译出错

make: 进入目录“/root/linux-stable-sw/tools/testing/selftests”
make[1]: 进入目录“/root/linux-stable-sw/tools/testing/selftests/sigaltstack”
gcc -Wall    sas.c  -o /root/linux-stable-sw/tools/testing/selftests/sigaltstack/sas
sas.c: In function 'my_usr1':
sas.c:46:25: error: invalid register name for 'sp'
  register unsigned long sp asm("sp");
                         ^~
make[1]: *** [../lib.mk:155：/root/linux-stable-sw/tools/testing/selftests/sigaltstack/sas] 错误 1
make[1]: 离开目录“/root/linux-stable-sw/tools/testing/selftests/sigaltstack”
make: *** [Makefile:85：all] 错误 2
make: 离开目录“/root/linux-stable-sw/tools/testing/selftests”
2.解决编译问题后，测试FAIL

selftests: sigaltstack: sas
========================================
ok 1 Initial sigaltstack state was SS_DISABLE
# [RUN] signal USR1
ok 2 sigaltstack is disabled in sighandler
# [RUN] switched to user ctx
# [RUN] signal USR2
# [OK]  Stack preserved
Bail out! ss_flags=2, should be SS_AUTODISARM
Pass 2 Fail 0 Xfail 0 Xpass 0 Skip 0 Error 0
1..2
not ok 1..1 selftests: sigaltstack: sas [FAIL]
【解决过程】

1.编译报错是由于sw64架构sp用的是$30；

2.测试FAIL是由于sw64架构的do_rt_sigreturn()调用实现流程缺少restore_altstack()判断；

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