[ceph.git] / ceph / src / boost / libs / context / src / asm / make_arm64_aapcs_elf_gas.S

/*
            Copyright Edward Nevill + Oliver Kowalke 2015
   Distributed under the Boost Software License, Version 1.0.
      (See accompanying file LICENSE_1_0.txt or copy at
          http://www.boost.org/LICENSE_1_0.txt)
*/
/*******************************************************
 *                                                     *
 *  -------------------------------------------------  *
 *  |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  *
 *  -------------------------------------------------  *
 *  | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c|  *
 *  -------------------------------------------------  *
 *  |    d8     |    d9     |    d10    |    d11    |  *
 *  -------------------------------------------------  *
 *  -------------------------------------------------  *
 *  |  8  |  9  |  10 |  11 |  12 |  13 |  14 |  15 |  *
 *  -------------------------------------------------  *
 *  | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c|  *
 *  -------------------------------------------------  *
 *  |    d12    |    d13    |    d14    |    d15    |  *
 *  -------------------------------------------------  *
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 *  |  16 |  17 |  18 |  19 |  20 |  21 |  22 |  23 |  *
 *  -------------------------------------------------  *
 *  | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c|  *
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 *  |    x19    |    x20    |    x21    |    x22    |  *
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 *  |  24 |  25 |  26 |  27 |  28 |  29 |  30 |  31 |  *
 *  -------------------------------------------------  *
 *  | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c|  *
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 *  |    x23    |    x24    |    x25    |    x26    |  *
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 *  |  32 |  33 |  34 |  35 |  36 |  37 |  38 |  39 |  *
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 *  | 0x80| 0x84| 0x88| 0x8c| 0x90| 0x94| 0x98| 0x9c|  *
 *  -------------------------------------------------  *
 *  |    x27    |    x28    |    FP     |     LR    |  *
 *  -------------------------------------------------  *
 *  -------------------------------------------------  *
 *  |  40 |  41 |  42 | 43  |           |           |  *
 *  -------------------------------------------------  *
 *  | 0xa0| 0xa4| 0xa8| 0xac|           |           |  *
 *  -------------------------------------------------  *
 *  |     PC    |   align   |           |           |  *
 *  -------------------------------------------------  *
 *                                                     *
 *******************************************************/

.text
.align  2
.global make_fcontext
.type   make_fcontext, %function
make_fcontext:
    # shift address in x0 (allocated stack) to lower 16 byte boundary
    and x0, x0, ~0xF

    # reserve space for context-data on context-stack
    sub  x0, x0, #0xb0

    # third arg of make_fcontext() == address of context-function
    # store address as a PC to jump in
    str  x2, [x0, #0xa0]

    # save address of finish as return-address for context-function
    # will be entered after context-function returns (LR register)
    adr  x1, finish
    str  x1, [x0, #0x98]

    ret  x30 // return pointer to context-data (x0)

finish:
    # exit code is zero
    mov  x0, #0
    # exit application
    bl  _exit

.size   make_fcontext,.-make_fcontext
# Mark that we don't need executable stack.
.section .note.GNU-stack,"",%progbits
Commit	Line	Data
7c673cae FG	1	/*
	2	Copyright Edward Nevill + Oliver Kowalke 2015
	3	Distributed under the Boost Software License, Version 1.0.
	4	(See accompanying file LICENSE_1_0.txt or copy at
	5	http://www.boost.org/LICENSE_1_0.txt)
	6	*/
	7	/*******************************************************
	8	* *
	9	* ------------------------------------------------- *
	10	* \| 0 \| 1 \| 2 \| 3 \| 4 \| 5 \| 6 \| 7 \| *
	11	* ------------------------------------------------- *
	12	* \| 0x0 \| 0x4 \| 0x8 \| 0xc \| 0x10\| 0x14\| 0x18\| 0x1c\| *
	13	* ------------------------------------------------- *
b32b8144	14	* \| d8 \| d9 \| d10 \| d11 \| *
7c673cae FG	15	* ------------------------------------------------- *
	16	* ------------------------------------------------- *
	17	* \| 8 \| 9 \| 10 \| 11 \| 12 \| 13 \| 14 \| 15 \| *
	18	* ------------------------------------------------- *
	19	* \| 0x20\| 0x24\| 0x28\| 0x2c\| 0x30\| 0x34\| 0x38\| 0x3c\| *
	20	* ------------------------------------------------- *
b32b8144	21	* \| d12 \| d13 \| d14 \| d15 \| *
7c673cae FG	22	* ------------------------------------------------- *
	23	* ------------------------------------------------- *
	24	* \| 16 \| 17 \| 18 \| 19 \| 20 \| 21 \| 22 \| 23 \| *
	25	* ------------------------------------------------- *
	26	* \| 0x40\| 0x44\| 0x48\| 0x4c\| 0x50\| 0x54\| 0x58\| 0x5c\| *
	27	* ------------------------------------------------- *
b32b8144	28	* \| x19 \| x20 \| x21 \| x22 \| *
7c673cae FG	29	* ------------------------------------------------- *
	30	* ------------------------------------------------- *
	31	* \| 24 \| 25 \| 26 \| 27 \| 28 \| 29 \| 30 \| 31 \| *
	32	* ------------------------------------------------- *
	33	* \| 0x60\| 0x64\| 0x68\| 0x6c\| 0x70\| 0x74\| 0x78\| 0x7c\| *
	34	* ------------------------------------------------- *
b32b8144 FG	35	* \| x23 \| x24 \| x25 \| x26 \| *
	36	* ------------------------------------------------- *
	37	* ------------------------------------------------- *
	38	* \| 32 \| 33 \| 34 \| 35 \| 36 \| 37 \| 38 \| 39 \| *
	39	* ------------------------------------------------- *
	40	* \| 0x80\| 0x84\| 0x88\| 0x8c\| 0x90\| 0x94\| 0x98\| 0x9c\| *
	41	* ------------------------------------------------- *
	42	* \| x27 \| x28 \| FP \| LR \| *
	43	* ------------------------------------------------- *
	44	* ------------------------------------------------- *
	45	* \| 40 \| 41 \| 42 \| 43 \| \| \| *
	46	* ------------------------------------------------- *
	47	* \| 0xa0\| 0xa4\| 0xa8\| 0xac\| \| \| *
	48	* ------------------------------------------------- *
7c673cae FG	49	* \| PC \| align \| \| \| *
	50	* ------------------------------------------------- *
	51	* *
	52	*******************************************************/
	53
7c673cae FG	54	.text
	55	.align 2
	56	.global make_fcontext
	57	.type make_fcontext, %function
	58	make_fcontext:
	59	# shift address in x0 (allocated stack) to lower 16 byte boundary
	60	and x0, x0, ~0xF
	61
	62	# reserve space for context-data on context-stack
b32b8144	63	sub x0, x0, #0xb0
7c673cae FG	64
	65	# third arg of make_fcontext() == address of context-function
	66	# store address as a PC to jump in
b32b8144	67	str x2, [x0, #0xa0]
7c673cae FG	68
	69	# save address of finish as return-address for context-function
	70	# will be entered after context-function returns (LR register)
	71	adr x1, finish
b32b8144	72	str x1, [x0, #0x98]
7c673cae FG	73
	74	ret x30 // return pointer to context-data (x0)
	75
	76	finish:
	77	# exit code is zero
	78	mov x0, #0
	79	# exit application
	80	bl _exit
	81
	82	.size make_fcontext,.-make_fcontext
	83	# Mark that we don't need executable stack.
	84	.section .note.GNU-stack,"",%progbits