diff options
Diffstat (limited to 'gcc/varasm.c')
| -rw-r--r-- | gcc/varasm.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/gcc/varasm.c b/gcc/varasm.c index b02462bdec4..bc314940347 100644 --- a/gcc/varasm.c +++ b/gcc/varasm.c @@ -99,6 +99,10 @@ bool first_function_block_is_cold; static alias_set_type const_alias_set; +/* Whether we saw any functions with no_split_stack. */ + +static bool saw_no_split_stack; + static const char *strip_reg_name (const char *); static int contains_pointers_p (tree); #ifdef ASM_OUTPUT_EXTERNAL @@ -1549,6 +1553,9 @@ assemble_start_function (tree decl, const char *fnname) /* Standard thing is just output label for the function. */ ASM_OUTPUT_FUNCTION_LABEL (asm_out_file, fnname, current_function_decl); #endif /* ASM_DECLARE_FUNCTION_NAME */ + + if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl))) + saw_no_split_stack = true; } /* Output assembler code associated with defining the size of the @@ -6649,6 +6656,28 @@ file_end_indicate_exec_stack (void) switch_to_section (get_section (".note.GNU-stack", flags, NULL)); } +/* Emit a special section directive to indicate that this object file + was compiled with -fsplit-stack. This is used to let the linker + detect calls between split-stack code and non-split-stack code, so + that it can modify the split-stack code to allocate a sufficiently + large stack. We emit another special section if there are any + functions in this file which have the no_split_stack attribute, to + prevent the linker from warning about being unable to convert the + functions if they call non-split-stack code. */ + +void +file_end_indicate_split_stack (void) +{ + if (flag_split_stack) + { + switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG, + NULL)); + if (saw_no_split_stack) + switch_to_section (get_section (".note.GNU-no-split-stack", + SECTION_DEBUG, NULL)); + } +} + /* Output DIRECTIVE (a C string) followed by a newline. This is used as a get_unnamed_section callback. */ |