microblaze/cpu/start.S

6  * Yasushi SHOJI <yashi@atmark-techno.com>
8  * SPDX-License-Identifier:	GPL-2.0+
11 #include <asm-offsets.h>
32 	addi	r1, r1, -4	/* Decrement SP to top of memory */
35 	addi	r1, r0, CONFIG_SYS_INIT_SP_OFFSET - CONFIG_VAL(SYS_MALLOC_F_LEN)
40 	addi	r1, r1, -4	/* Decrement SP to top of memory */
42 	/* Find-out if u-boot is running on BIG/LITTLE endian platform
47 	 * 4a) LITTLE endian - r10 contains 0x2 because it is the smallest
49 	 * 4b) BIG endian - r10 contains 0x0 because 0x2 offset is on addr 0x3
57 	/* add opcode instruction for 32bit jump - 2 instruction imm & brai */
63 	swi	r2, r0, 0x0	/* reset address - imm opcode */
64 	swi	r3, r0, 0x4	/* reset address - brai opcode */
67 	sw	r6, r1, r0
77 	swi	r2, r0, 0x8	/* user vector exception - imm opcode */
78 	swi	r3, r0, 0xC	/* user vector exception - brai opcode */
81 	sw	r6, r1, r0
83 	 * BIG ENDIAN memory map for user exception
93 	 * LITTLE ENDIAN memory map for user exception
110 	swi	r2, r0, 0x10	/* interrupt - imm opcode */
111 	swi	r3, r0, 0x14	/* interrupt - brai opcode */
114 	sw	r6, r1, r0
121 	/* hardware exception */
122 	swi	r2, r0, 0x20	/* hardware exception - imm opcode */
123 	swi	r3, r0, 0x24	/* hardware exception - brai opcode */
126 	sw	r6, r1, r0
163 	or	r5, r0, r0	/* flags - empty */
204  * first parameter(r5) - address, second(r6) - short value
220  * Relocate u-boot
228 	 * r5 - start_addr_sp
229 	 * r6 - new_gd
230 	 * r7 - reloc_addr
236 	/* Relocate text and data - r12 temp value */
238 	addi	r22, r0, __end - 4 /* Include BSS too */
242 1:	lw	r12, r21, r5 /* Load u-boot data */
243 	sw	r12, r23, r5 /* Write zero to loc */
246 	addi	r5, r5, 4 /* Increment to next loc - relocate code */
251 	rsub	r23, r24, r23 /* keep - this is already here gd->reloc_off */
262 	sw	r6, r1, r0
271 	sw	r6, r1, r0
280 	sw	r6, r1, r0
291 	beqi	r12, 2f /* No GOT table - jump over */
294 	addik	r22, r22, -0x10
299 	sw	r12, r21, r0 /* Save entry back */