From 4cb4721f9371ac318e33cbed99a66a029353e10a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marcin=20Ko=C5=9Bcielnicki?= Date: Mon, 15 Feb 2016 10:20:18 +0000 Subject: S/390: Add -fsplit-stack support libgcc/ChangeLog: * config.host: Use t-stack and t-stack-s390 for s390*-*-linux. * config/s390/morestack.S: New file. * config/s390/t-stack-s390: New file. * generic-morestack.c (__splitstack_find): Add s390-specific code. gcc/ChangeLog: * common/config/s390/s390-common.c (s390_supports_split_stack): New function. (TARGET_SUPPORTS_SPLIT_STACK): New macro. * config/s390/s390-protos.h: Add s390_expand_split_stack_prologue. * config/s390/s390.c (struct machine_function): New field split_stack_varargs_pointer. (s390_register_info): Mark r12 as clobbered if it'll be used as temp in s390_emit_prologue. (s390_emit_prologue): Use r12 as temp if r1 is taken by split-stack vararg pointer. (morestack_ref): New global. (SPLIT_STACK_AVAILABLE): New macro. (s390_expand_split_stack_prologue): New function. (s390_live_on_entry): New function. (s390_va_start): Use split-stack vararg pointer if appropriate. (s390_asm_file_end): Emit the split-stack note sections. (TARGET_EXTRA_LIVE_ON_ENTRY): New macro. * config/s390/s390.md (UNSPEC_STACK_CHECK): New unspec. (UNSPECV_SPLIT_STACK_CALL): New unspec. (UNSPECV_SPLIT_STACK_DATA): New unspec. (split_stack_prologue): New expand. (split_stack_space_check): New expand. (split_stack_data): New insn. (split_stack_call): New expand. (split_stack_call_*): New insn. (split_stack_cond_call): New expand. (split_stack_cond_call_*): New insn. From-SVN: r233421 --- gcc/common/config/s390/s390-common.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'gcc/common') diff --git a/gcc/common/config/s390/s390-common.c b/gcc/common/config/s390/s390-common.c index 4519c21..1e497e6 100644 --- a/gcc/common/config/s390/s390-common.c +++ b/gcc/common/config/s390/s390-common.c @@ -105,6 +105,17 @@ s390_handle_option (struct gcc_options *opts ATTRIBUTE_UNUSED, } } +/* -fsplit-stack uses a field in the TCB, available with glibc-2.23. + We don't verify it, since earlier versions just have padding at + its place, which works just as well. */ + +static bool +s390_supports_split_stack (bool report ATTRIBUTE_UNUSED, + struct gcc_options *opts ATTRIBUTE_UNUSED) +{ + return true; +} + #undef TARGET_DEFAULT_TARGET_FLAGS #define TARGET_DEFAULT_TARGET_FLAGS (TARGET_DEFAULT) @@ -117,4 +128,7 @@ s390_handle_option (struct gcc_options *opts ATTRIBUTE_UNUSED, #undef TARGET_OPTION_INIT_STRUCT #define TARGET_OPTION_INIT_STRUCT s390_option_init_struct +#undef TARGET_SUPPORTS_SPLIT_STACK +#define TARGET_SUPPORTS_SPLIT_STACK s390_supports_split_stack + struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER; -- cgit v1.1