diff options
| -rw-r--r-- | tools/include/nolibc/arch-arm.h | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/tools/include/nolibc/arch-arm.h b/tools/include/nolibc/arch-arm.h index 875b21975137..e4ba77b0310f 100644 --- a/tools/include/nolibc/arch-arm.h +++ b/tools/include/nolibc/arch-arm.h @@ -180,10 +180,16 @@ void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void) __asm__ volatile ( "pop {%r0}\n" // argc was in the stack "mov %r1, %sp\n" // argv = sp - "add %r2, %r1, %r0, lsl #2\n" // envp = argv + 4*argc ... - "add %r2, %r2, $4\n" // ... + 4 - "and %r3, %r1, $-8\n" // AAPCS : sp must be 8-byte aligned in the - "mov %sp, %r3\n" // callee, an bl doesn't push (lr=pc) + + "add %r2, %r0, $1\n" // envp = (argc + 1) ... + "lsl %r2, %r2, $2\n" // * 4 ... + "add %r2, %r2, %r1\n" // + argv + + "mov %r3, $8\n" // AAPCS : sp must be 8-byte aligned in the + "neg %r3, %r3\n" // callee, and bl doesn't push (lr=pc) + "and %r3, %r3, %r1\n" // so we do sp = r1(=sp) & r3(=-8); + "mov %sp, %r3\n" // + "bl main\n" // main() returns the status code, we'll exit with it. "movs r7, $1\n" // NR_exit == 1 "svc $0x00\n" |