WIP: add _auxv retrieval for arm64
diff --git a/tools/include/nolibc/arch-aarch64.h b/tools/include/nolibc/arch-aarch64.h
index 96e0521..d1be8c5 100644
--- a/tools/include/nolibc/arch-aarch64.h
+++ b/tools/include/nolibc/arch-aarch64.h
@@ -182,6 +182,7 @@ struct sys_stat_struct {
})
char **environ __attribute__((weak));
+const void *_auxv __attribute__((weak));
/* startup code */
__asm__ (".section .text\n"
@@ -194,6 +195,12 @@ __asm__ (".section .text\n"
"add x2, x2, x1\n" // + argv
"adrp x3, environ\n" // x3 = &environ (high bits)
"str x2, [x3, #:lo12:environ]\n" // store envp into environ
+ "mov x4, x2\n" // search for auxv (follows NULL after last env)
+ "0:\n"
+ "ldr x5, [x4], 8\n" // x5 = *x4; x4 += 8
+ "cbnz x5, 0b\n" // and stop at NULL after last env
+ "adrp x3, _auxv\n" // x3 = &_auxv (high bits)
+ "str x4, [x3, #:lo12:_auxv]\n" // store x4 into _auxv
"and sp, x1, -16\n" // sp must be 16-byte aligned in the callee
"bl main\n" // main() returns the status code, we'll exit with it.
"mov x8, 93\n" // NR_exit == 93
