})
/* startup code */
-__asm__ (".section .text\n"
- ".weak _start\n"
- "_start:\n"
- "ldr x0, [sp]\n" // argc (x0) was in the stack
- "add x1, sp, 8\n" // argv (x1) = sp
- "lsl x2, x0, 3\n" // envp (x2) = 8*argc ...
- "add x2, x2, 8\n" // + 8 (skip null)
- "add x2, x2, x1\n" // + argv
- "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
- "svc #0\n"
- "");
-
+void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void)
+{
+ __asm__ volatile (
+ "ldr x0, [sp]\n" // argc (x0) was in the stack
+ "add x1, sp, 8\n" // argv (x1) = sp
+ "lsl x2, x0, 3\n" // envp (x2) = 8*argc ...
+ "add x2, x2, 8\n" // + 8 (skip null)
+ "add x2, x2, x1\n" // + argv
+ "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
+ "svc #0\n"
+ );
+ __builtin_unreachable();
+}
#endif // _NOLIBC_ARCH_AARCH64_H
})
/* startup code */
-__asm__ (".section .text\n"
- ".weak _start\n"
- "_start:\n"
-#if defined(__THUMBEB__) || defined(__THUMBEL__)
- /* We enter here in 32-bit mode but if some previous functions were in
- * 16-bit mode, the assembler cannot know, so we need to tell it we're in
- * 32-bit now, then switch to 16-bit (is there a better way to do it than
- * adding 1 by hand ?) and tell the asm we're now in 16-bit mode so that
- * it generates correct instructions. Note that we do not support thumb1.
- */
- ".code 32\n"
- "add r0, pc, #1\n"
- "bx r0\n"
- ".code 16\n"
-#endif
- "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)
- "bl main\n" // main() returns the status code, we'll exit with it.
- "movs r7, $1\n" // NR_exit == 1
- "svc $0x00\n"
- "");
+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)
+ "bl main\n" // main() returns the status code, we'll exit with it.
+ "movs r7, $1\n" // NR_exit == 1
+ "svc $0x00\n"
+ );
+ __builtin_unreachable();
+}
#endif // _NOLIBC_ARCH_ARM_H
* 2) The deepest stack frame should be set to zero
*
*/
-__asm__ (".section .text\n"
- ".weak _start\n"
- "_start:\n"
- "pop %eax\n" // argc (first arg, %eax)
- "mov %esp, %ebx\n" // argv[] (second arg, %ebx)
- "lea 4(%ebx,%eax,4),%ecx\n" // then a NULL then envp (third arg, %ecx)
- "xor %ebp, %ebp\n" // zero the stack frame
- "and $-16, %esp\n" // x86 ABI : esp must be 16-byte aligned before
- "sub $4, %esp\n" // the call instruction (args are aligned)
- "push %ecx\n" // push all registers on the stack so that we
- "push %ebx\n" // support both regparm and plain stack modes
- "push %eax\n"
- "call main\n" // main() returns the status code in %eax
- "mov %eax, %ebx\n" // retrieve exit code (32-bit int)
- "movl $1, %eax\n" // NR_exit == 1
- "int $0x80\n" // exit now
- "hlt\n" // ensure it does not
- "");
+void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void)
+{
+ __asm__ volatile (
+ "pop %eax\n" // argc (first arg, %eax)
+ "mov %esp, %ebx\n" // argv[] (second arg, %ebx)
+ "lea 4(%ebx,%eax,4),%ecx\n" // then a NULL then envp (third arg, %ecx)
+ "xor %ebp, %ebp\n" // zero the stack frame
+ "and $-16, %esp\n" // x86 ABI : esp must be 16-byte aligned before
+ "sub $4, %esp\n" // the call instruction (args are aligned)
+ "push %ecx\n" // push all registers on the stack so that we
+ "push %ebx\n" // support both regparm and plain stack modes
+ "push %eax\n"
+ "call main\n" // main() returns the status code in %eax
+ "mov %eax, %ebx\n" // retrieve exit code (32-bit int)
+ "movl $1, %eax\n" // NR_exit == 1
+ "int $0x80\n" // exit now
+ "hlt\n" // ensure it does not
+ );
+ __builtin_unreachable();
+}
#endif // _NOLIBC_ARCH_I386_H
})
/* startup code, note that it's called __start on MIPS */
-__asm__ (".section .text\n"
- ".weak __start\n"
- ".set nomips16\n"
- ".set push\n"
- ".set noreorder\n"
- ".option pic0\n"
- ".ent __start\n"
- "__start:\n"
- "lw $a0,($sp)\n" // argc was in the stack
- "addiu $a1, $sp, 4\n" // argv = sp + 4
- "sll $a2, $a0, 2\n" // a2 = argc * 4
- "add $a2, $a2, $a1\n" // envp = argv + 4*argc ...
- "addiu $a2, $a2, 4\n" // ... + 4
- "li $t0, -8\n"
- "and $sp, $sp, $t0\n" // sp must be 8-byte aligned
- "addiu $sp,$sp,-16\n" // the callee expects to save a0..a3 there!
- "jal main\n" // main() returns the status code, we'll exit with it.
- "nop\n" // delayed slot
- "move $a0, $v0\n" // retrieve 32-bit exit code from v0
- "li $v0, 4001\n" // NR_exit == 4001
- "syscall\n"
- ".end __start\n"
- ".set pop\n"
- "");
+void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __start(void)
+{
+ __asm__ volatile (
+ //".set nomips16\n"
+ ".set push\n"
+ ".set noreorder\n"
+ ".option pic0\n"
+ //".ent __start\n"
+ //"__start:\n"
+ "lw $a0,($sp)\n" // argc was in the stack
+ "addiu $a1, $sp, 4\n" // argv = sp + 4
+ "sll $a2, $a0, 2\n" // a2 = argc * 4
+ "add $a2, $a2, $a1\n" // envp = argv + 4*argc ...
+ "addiu $a2, $a2, 4\n" // ... + 4
+ "li $t0, -8\n"
+ "and $sp, $sp, $t0\n" // sp must be 8-byte aligned
+ "addiu $sp,$sp,-16\n" // the callee expects to save a0..a3 there!
+ "jal main\n" // main() returns the status code, we'll exit with it.
+ "nop\n" // delayed slot
+ "move $a0, $v0\n" // retrieve 32-bit exit code from v0
+ "li $v0, 4001\n" // NR_exit == 4001
+ "syscall\n"
+ //".end __start\n"
+ ".set pop\n"
+ );
+ __builtin_unreachable();
+}
#endif // _NOLIBC_ARCH_MIPS_H
})
/* startup code */
-__asm__ (".section .text\n"
- ".weak _start\n"
- "_start:\n"
- ".option push\n"
- ".option norelax\n"
- "lla gp, __global_pointer$\n"
- ".option pop\n"
- "lw a0, 0(sp)\n" // argc (a0) was in the stack
- "add a1, sp, "SZREG"\n" // argv (a1) = sp
- "slli a2, a0, "PTRLOG"\n" // envp (a2) = SZREG*argc ...
- "add a2, a2, "SZREG"\n" // + SZREG (skip null)
- "add a2,a2,a1\n" // + argv
- "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
- "ecall\n"
- "");
+void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void)
+{
+ __asm__ volatile (
+ ".option push\n"
+ ".option norelax\n"
+ "lla gp, __global_pointer$\n"
+ ".option pop\n"
+ "lw a0, 0(sp)\n" // argc (a0) was in the stack
+ "add a1, sp, "SZREG"\n" // argv (a1) = sp
+ "slli a2, a0, "PTRLOG"\n" // envp (a2) = SZREG*argc ...
+ "add a2, a2, "SZREG"\n" // + SZREG (skip null)
+ "add a2,a2,a1\n" // + argv
+ "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
+ "ecall\n"
+ );
+ __builtin_unreachable();
+}
#endif // _NOLIBC_ARCH_RISCV_H
})
/* startup code */
-__asm__ (".section .text\n"
- ".weak _start\n"
- "_start:\n"
- "lg %r2,0(%r15)\n" /* argument count */
- "la %r3,8(%r15)\n" /* argument pointers */
-
- "xgr %r0,%r0\n" /* r0 will be our NULL value */
- /* search for envp */
- "lgr %r4,%r3\n" /* start at argv */
- "0:\n"
- "clg %r0,0(%r4)\n" /* entry zero? */
- "la %r4,8(%r4)\n" /* advance pointer */
- "jnz 0b\n" /* no -> test next pointer */
- /* yes -> r4 now contains start of envp */
-
- "aghi %r15,-160\n" /* allocate new stackframe */
- "xc 0(8,%r15),0(%r15)\n" /* clear backchain */
- "brasl %r14,main\n" /* ret value of main is arg to exit */
- "lghi %r1,1\n" /* __NR_exit */
- "svc 0\n"
- "");
+void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void)
+{
+ __asm__ volatile (
+ "lg %r2,0(%r15)\n" /* argument count */
+ "la %r3,8(%r15)\n" /* argument pointers */
+
+ "xgr %r0,%r0\n" /* r0 will be our NULL value */
+ /* search for envp */
+ "lgr %r4,%r3\n" /* start at argv */
+ "0:\n"
+ "clg %r0,0(%r4)\n" /* entry zero? */
+ "la %r4,8(%r4)\n" /* advance pointer */
+ "jnz 0b\n" /* no -> test next pointer */
+ /* yes -> r4 now contains start of envp */
+
+ "aghi %r15,-160\n" /* allocate new stackframe */
+ "xc 0(8,%r15),0(%r15)\n" /* clear backchain */
+ "brasl %r14,main\n" /* ret value of main is arg to exit */
+ "lghi %r1,1\n" /* __NR_exit */
+ "svc 0\n"
+ );
+ __builtin_unreachable();
+}
struct s390_mmap_arg_struct {
unsigned long addr;
* 2) The deepest stack frame should be zero (the %rbp).
*
*/
-__asm__ (".section .text\n"
- ".weak _start\n"
- "_start:\n"
- "pop %rdi\n" // argc (first arg, %rdi)
- "mov %rsp, %rsi\n" // argv[] (second arg, %rsi)
- "lea 8(%rsi,%rdi,8),%rdx\n" // then a NULL then envp (third arg, %rdx)
- "xor %ebp, %ebp\n" // zero the stack frame
- "and $-16, %rsp\n" // x86 ABI : esp must be 16-byte aligned before call
- "call main\n" // main() returns the status code, we'll exit with it.
- "mov %eax, %edi\n" // retrieve exit code (32 bit)
- "mov $60, %eax\n" // NR_exit == 60
- "syscall\n" // really exit
- "hlt\n" // ensure it does not return
- "");
+void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void)
+{
+ __asm__ volatile (
+ "pop %rdi\n" // argc (first arg, %rdi)
+ "mov %rsp, %rsi\n" // argv[] (second arg, %rsi)
+ "lea 8(%rsi,%rdi,8),%rdx\n" // then a NULL then envp (third arg, %rdx)
+ "xor %ebp, %ebp\n" // zero the stack frame
+ "and $-16, %rsp\n" // x86 ABI : esp must be 16-byte aligned before call
+ "call main\n" // main() returns the status code, we'll exit with it.
+ "mov %eax, %edi\n" // retrieve exit code (32 bit)
+ "mov $60, %eax\n" // NR_exit == 60
+ "syscall\n" // really exit
+ "hlt\n" // ensure it does not return
+ );
+ __builtin_unreachable();
+}
#endif // _NOLIBC_ARCH_X86_64_H
projects / linux.git / commitdiff