Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0-or-later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Code to process dynamic relocations in the kernel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright 2008 Paul Mackerras, IBM Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <asm/ppc_asm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) RELA = 7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) RELACOUNT = 0x6ffffff9
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) R_PPC64_RELATIVE = 22
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  * r3 = desired final address of kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) _GLOBAL(relocate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	mflr	r0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	bcl	20,31,$+4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 0:	mflr	r12		/* r12 has runtime addr of label 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	mtlr	r0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	ld	r11,(p_dyn - 0b)(r12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	add	r11,r11,r12	/* r11 has runtime addr of .dynamic section */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	ld	r9,(p_rela - 0b)(r12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	add	r9,r9,r12	/* r9 has runtime addr of .rela.dyn section */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	ld	r10,(p_st - 0b)(r12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	add	r10,r10,r12	/* r10 has runtime addr of _stext */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	 * Scan the dynamic section for the RELA and RELACOUNT entries.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	li	r7,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	li	r8,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 1:	ld	r6,0(r11)	/* get tag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	cmpdi	r6,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	beq	4f		/* end of list */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	cmpdi	r6,RELA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	bne	2f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	ld	r7,8(r11)	/* get RELA pointer in r7 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	b	3f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 2:	addis	r6,r6,(-RELACOUNT)@ha
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	cmpdi	r6,RELACOUNT@l
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	bne	3f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	ld	r8,8(r11)	/* get RELACOUNT value in r8 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 3:	addi	r11,r11,16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	b	1b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 4:	cmpdi	r7,0		/* check we have both RELA and RELACOUNT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	cmpdi	cr1,r8,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	beq	6f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	beq	cr1,6f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	 * Work out linktime address of _stext and hence the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	 * relocation offset to be applied.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	 * cur_offset [r7] = rela.run [r9] - rela.link [r7]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	 * _stext.link [r10] = _stext.run [r10] - cur_offset [r7]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	 * final_offset [r3] = _stext.final [r3] - _stext.link [r10]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	subf	r7,r7,r9	/* cur_offset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	subf	r10,r7,r10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	subf	r3,r10,r3	/* final_offset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	 * Run through the list of relocations and process the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	 * R_PPC64_RELATIVE ones.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	mtctr	r8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 5:	ld	r0,8(9)		/* ELF64_R_TYPE(reloc->r_info) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	cmpdi	r0,R_PPC64_RELATIVE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	bne	6f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	ld	r6,0(r9)	/* reloc->r_offset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	ld	r0,16(r9)	/* reloc->r_addend */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	add	r0,r0,r3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	stdx	r0,r7,r6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	addi	r9,r9,24
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	bdnz	5b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 6:	blr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) .balign 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) p_dyn:	.8byte	__dynamic_start - 0b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) p_rela:	.8byte	__rela_dyn_start - 0b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) p_st:	.8byte	_stext - 0b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)