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textflag
A flag for the “ld” linker, with special link-time information about a function.
textflag 7
Extracted from a comment in pkg/runtime/proc.c:
'' * Newproc and deferproc need to be textflag 7 * (no possible stack split when nearing overflow) ''
See split stacks.
Usage
In “cc” C, add a pragma directive before the function definition – example:
'' #pragma textflag 7 void somefunction(int x, int y) {
//...
} ''
In “asm” assembly, put the number 7 in function's entry point definition line – example:
'' TEXT runtime·tstart(SB),7,$0 ''
Note: These C and assembly syntaxes are supported only by the C compilers and assemblers shipped with Go (i.e. the modified Plan 9 ones). Stock Gcc does not have the ability to set these flags (but maybe a Gcc with gccgo integrated in it can?)