src/third_party/llvm-project/compiler-rt/lib/builtins/hexagon/common_entry_exit_abi2.S

//===----------------------Hexagon builtin routine ------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

/* Functions that implement common sequences in function prologues and epilogues
   used to save code size */

	.macro FUNCTION_BEGIN name
	.p2align 2
        .section .text.\name,"ax",@progbits
	.globl \name
	.type  \name, @function
\name:
	.endm

	.macro FUNCTION_END name
	.size  \name, . - \name
	.endm

	.macro FALLTHROUGH_TAIL_CALL name0 name1
	.p2align 2
	.size \name0, . - \name0
	.globl \name1
	.type \name1, @function
\name1:
	.endm




/* Save r17:16 at fp+#-8, r19:18 at fp+#-16, r21:20 at fp+#-24, r23:22 at
   fp+#-32, r25:24 at fp+#-40, and r27:26 at fp+#-48.
   The compiler knows that the __save_* functions clobber LR.  No other
   registers should be used without informing the compiler. */

FUNCTION_BEGIN __save_r16_through_r27
        {
                memd(fp+#-48) = r27:26
                memd(fp+#-40) = r25:24
        }
        {
                memd(fp+#-32) = r23:22
                memd(fp+#-24) = r21:20
        }
        {
                memd(fp+#-16) = r19:18
                memd(fp+#-8) = r17:16
                jumpr lr
        }
FUNCTION_END __save_r16_through_r27

FUNCTION_BEGIN __save_r16_through_r25
        {
                memd(fp+#-40) = r25:24
                memd(fp+#-32) = r23:22
        }
        {
                memd(fp+#-24) = r21:20
                memd(fp+#-16) = r19:18
        }
        {
                memd(fp+#-8) = r17:16
                jumpr lr
        }
FUNCTION_END __save_r16_through_r25

FUNCTION_BEGIN __save_r16_through_r23
        {
                memd(fp+#-32) = r23:22
                memd(fp+#-24) = r21:20
        }
        {
                memd(fp+#-16) = r19:18
                memd(fp+#-8) = r17:16
                jumpr lr
        }
FUNCTION_END __save_r16_through_r23

FUNCTION_BEGIN __save_r16_through_r21
        {
                memd(fp+#-24) = r21:20
                memd(fp+#-16) = r19:18
        }
        {
                memd(fp+#-8) = r17:16
                jumpr lr
        }
FUNCTION_END __save_r16_through_r21

FUNCTION_BEGIN __save_r16_through_r19
        {
                memd(fp+#-16) = r19:18
                memd(fp+#-8) = r17:16
                jumpr lr
        }
FUNCTION_END __save_r16_through_r19

FUNCTION_BEGIN __save_r16_through_r17
        {
                memd(fp+#-8) = r17:16
                jumpr lr
        }
FUNCTION_END __save_r16_through_r17

/* For each of the *_before_tailcall functions, jumpr lr is executed in parallel
   with deallocframe.  That way, the return gets the old value of lr, which is
   where these functions need to return, and at the same time, lr gets the value
   it needs going into the tail call. */


FUNCTION_BEGIN __restore_r16_through_r27_and_deallocframe_before_tailcall
                r27:26 = memd(fp+#-48)
        {
                r25:24 = memd(fp+#-40)
                r23:22 = memd(fp+#-32)
        }
        {
                r21:20 = memd(fp+#-24)
                r19:18 = memd(fp+#-16)
        }
        {
                r17:16 = memd(fp+#-8)
                deallocframe
                jumpr lr
        }
FUNCTION_END __restore_r16_through_r27_and_deallocframe_before_tailcall

FUNCTION_BEGIN __restore_r16_through_r25_and_deallocframe_before_tailcall
        {
                r25:24 = memd(fp+#-40)
                r23:22 = memd(fp+#-32)
        }
        {
                r21:20 = memd(fp+#-24)
                r19:18 = memd(fp+#-16)
        }
        {
                r17:16 = memd(fp+#-8)
                deallocframe
                jumpr lr
        }
FUNCTION_END __restore_r16_through_r25_and_deallocframe_before_tailcall

FUNCTION_BEGIN __restore_r16_through_r23_and_deallocframe_before_tailcall
        {
                r23:22 = memd(fp+#-32)
                r21:20 = memd(fp+#-24)
        }
                r19:18 = memd(fp+#-16)
        {
                r17:16 = memd(fp+#-8)
                deallocframe
                jumpr lr
        }
FUNCTION_END __restore_r16_through_r23_and_deallocframe_before_tailcall


FUNCTION_BEGIN __restore_r16_through_r21_and_deallocframe_before_tailcall
        {
                r21:20 = memd(fp+#-24)
                r19:18 = memd(fp+#-16)
        }
        {
                r17:16 = memd(fp+#-8)
                deallocframe
                jumpr lr
        }
FUNCTION_END __restore_r16_through_r19_and_deallocframe_before_tailcall

FUNCTION_BEGIN __restore_r16_through_r19_and_deallocframe_before_tailcall
                r19:18 = memd(fp+#-16)
        {
                r17:16 = memd(fp+#-8)
                deallocframe
                jumpr lr
        }
FUNCTION_END __restore_r16_through_r19_and_deallocframe_before_tailcall

FUNCTION_BEGIN __restore_r16_through_r17_and_deallocframe_before_tailcall
        {
                r17:16 = memd(fp+#-8)
                deallocframe
                jumpr lr
        }
FUNCTION_END __restore_r16_through_r17_and_deallocframe_before_tailcall


FUNCTION_BEGIN __restore_r16_through_r27_and_deallocframe
                r27:26 = memd(fp+#-48)
        {
                r25:24 = memd(fp+#-40)
                r23:22 = memd(fp+#-32)
        }
        {
                r21:20 = memd(fp+#-24)
                r19:18 = memd(fp+#-16)
        }
	{
		r17:16 = memd(fp+#-8)
		dealloc_return
	}
FUNCTION_END __restore_r16_through_r27_and_deallocframe

FUNCTION_BEGIN __restore_r16_through_r25_and_deallocframe
        {
                r25:24 = memd(fp+#-40)
                r23:22 = memd(fp+#-32)
        }
        {
                r21:20 = memd(fp+#-24)
                r19:18 = memd(fp+#-16)
        }
	{
		r17:16 = memd(fp+#-8)
		dealloc_return
	}
FUNCTION_END __restore_r16_through_r25_and_deallocframe

FUNCTION_BEGIN __restore_r16_through_r23_and_deallocframe
        {
                r23:22 = memd(fp+#-32)
        }
        {
                r21:20 = memd(fp+#-24)
                r19:18 = memd(fp+#-16)
        }
	{
		r17:16 = memd(fp+#-8)
		dealloc_return
	}
FUNCTION_END __restore_r16_through_r23_and_deallocframe

FUNCTION_BEGIN __restore_r16_through_r21_and_deallocframe
        {
                r21:20 = memd(fp+#-24)
                r19:18 = memd(fp+#-16)
        }
	{
		r17:16 = memd(fp+#-8)
		dealloc_return
	}
FUNCTION_END __restore_r16_through_r21_and_deallocframe

FUNCTION_BEGIN __restore_r16_through_r19_and_deallocframe
	{
                r19:18 = memd(fp+#-16)
		r17:16 = memd(fp+#-8)
        }
        {
		dealloc_return
	}
FUNCTION_END __restore_r16_through_r19_and_deallocframe

FUNCTION_BEGIN __restore_r16_through_r17_and_deallocframe
	{
		r17:16 = memd(fp+#-8)
		dealloc_return
	}
FUNCTION_END __restore_r16_through_r17_and_deallocframe

FUNCTION_BEGIN __deallocframe
        dealloc_return
FUNCTION_END __deallocframe