Commit 758f3337 authored by Willy Tarreau's avatar Willy Tarreau Committed by Paul E. McKenney
Browse files

tools/nolibc: export environ as a weak symbol on riscv 



The environ is retrieved from the _start code and is easy to store at
this moment. Let's declare the variable weak and store the value into
it. By not being static it will be visible to all units. By being weak,
if some programs already declared it, they will continue to be able to
use it. This was tested on riscv64 both with environ inherited from
_start and extracted from envp.

Signed-off-by: default avatarWilly Tarreau <w@1wt.eu>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 8f7fafeb

tools/include/nolibc/arch-riscv.h

+4 −0
Original line number Diff line number Diff line
@@ -170,6 +170,8 @@ struct sys_stat_struct { 
	_arg1;                                                                \

})



char **environ __attribute__((weak));



/* startup code */

void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void)

{
@@ -183,6 +185,8 @@ void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void) 
		"slli  a2, a0, "PTRLOG"\n"   // envp (a2) = SZREG*argc ...

		"add   a2, a2, "SZREG"\n"    //             + SZREG (skip null)

		"add   a2,a2,a1\n"           //             + argv

		"lui a3, %hi(environ)\n"     // a3 = &environ (high bits)

		"sd a2,%lo(environ)(a3)\n"   // store envp(a2) into environ

		"andi  sp,a1,-16\n"          // sp must be 16-byte aligned

		"call  main\n"               // main() returns the status code, we'll exit with it.

		"li a7, 93\n"                // NR_exit == 93