12874c5fdSThomas Gleixner/* SPDX-License-Identifier: GPL-2.0-or-later */ 294b212c2SPaul Mackerras/* 394b212c2SPaul Mackerras * Copyright (C) Paul Mackerras 1997. 494b212c2SPaul Mackerras * 5f16e9684SCédric Le Goater * Adapted for 64 bit LE PowerPC by Andrew Tauferner 694b212c2SPaul Mackerras */ 794b212c2SPaul Mackerras 894b212c2SPaul Mackerras#include "ppc_asm.h" 994b212c2SPaul Mackerras 10f16e9684SCédric Le GoaterRELA = 7 11f16e9684SCédric Le GoaterRELACOUNT = 0x6ffffff9 12f16e9684SCédric Le Goater 135564597dSPaul Mackerras .data 146975a783SMichael Ellerman /* A procedure descriptor used when booting this as a COFF file. 156975a783SMichael Ellerman * When making COFF, this comes first in the link and we're 166975a783SMichael Ellerman * linked at 0x500000. 176975a783SMichael Ellerman */ 18f40e524eSPaul Mackerras .globl _zimage_start_opd 1966a45dd3SPaul Mackerras_zimage_start_opd: 206975a783SMichael Ellerman .long 0x500000, 0, 0, 0 215564597dSPaul Mackerras .text 225564597dSPaul Mackerras b _zimage_start 236975a783SMichael Ellerman 24f16e9684SCédric Le Goater#ifdef __powerpc64__ 25f16e9684SCédric Le Goater.balign 8 26eb039161STobin C. Hardingp_start: .8byte _start 27eb039161STobin C. Hardingp_etext: .8byte _etext 28eb039161STobin C. Hardingp_bss_start: .8byte __bss_start 29eb039161STobin C. Hardingp_end: .8byte _end 30f16e9684SCédric Le Goater 31eb039161STobin C. Hardingp_toc: .8byte __toc_start + 0x8000 - p_base 32eb039161STobin C. Hardingp_dyn: .8byte __dynamic_start - p_base 33eb039161STobin C. Hardingp_rela: .8byte __rela_dyn_start - p_base 34eb039161STobin C. Hardingp_prom: .8byte 0 35f16e9684SCédric Le Goater .weak _platform_stack_top 36eb039161STobin C. Hardingp_pstack: .8byte _platform_stack_top 37f16e9684SCédric Le Goater#else 386975a783SMichael Ellermanp_start: .long _start 396975a783SMichael Ellermanp_etext: .long _etext 406975a783SMichael Ellermanp_bss_start: .long __bss_start 416975a783SMichael Ellermanp_end: .long _end 426975a783SMichael Ellerman 436975a783SMichael Ellerman .weak _platform_stack_top 446975a783SMichael Ellermanp_pstack: .long _platform_stack_top 45f16e9684SCédric Le Goater#endif 4666a45dd3SPaul Mackerras 4794b212c2SPaul Mackerras .globl _zimage_start 48ee9d21b3SJoel Stanley /* Clang appears to require the .weak directive to be after the symbol 49ee9d21b3SJoel Stanley * is defined. See https://bugs.llvm.org/show_bug.cgi?id=38921 */ 50ee9d21b3SJoel Stanley .weak _zimage_start 5194b212c2SPaul Mackerras_zimage_start: 52160cc3ecSMilton Miller .globl _zimage_start_lib 53160cc3ecSMilton Miller_zimage_start_lib: 5466a45dd3SPaul Mackerras /* Work out the offset between the address we were linked at 5566a45dd3SPaul Mackerras and the address where we're running. */ 566975a783SMichael Ellerman bl .+4 576975a783SMichael Ellermanp_base: mflr r10 /* r10 now points to runtime addr of p_base */ 58f16e9684SCédric Le Goater#ifndef __powerpc64__ 596975a783SMichael Ellerman /* grab the link address of the dynamic section in r11 */ 606975a783SMichael Ellerman addis r11,r10,(_GLOBAL_OFFSET_TABLE_-p_base)@ha 616975a783SMichael Ellerman lwz r11,(_GLOBAL_OFFSET_TABLE_-p_base)@l(r11) 626975a783SMichael Ellerman cmpwi r11,0 636975a783SMichael Ellerman beq 3f /* if not linked -pie */ 646975a783SMichael Ellerman /* get the runtime address of the dynamic section in r12 */ 656975a783SMichael Ellerman .weak __dynamic_start 666975a783SMichael Ellerman addis r12,r10,(__dynamic_start-p_base)@ha 676975a783SMichael Ellerman addi r12,r12,(__dynamic_start-p_base)@l 686975a783SMichael Ellerman subf r11,r11,r12 /* runtime - linktime offset */ 6994b212c2SPaul Mackerras 706975a783SMichael Ellerman /* The dynamic section contains a series of tagged entries. 716975a783SMichael Ellerman * We need the RELA and RELACOUNT entries. */ 726975a783SMichael Ellerman li r9,0 736975a783SMichael Ellerman li r0,0 746975a783SMichael Ellerman9: lwz r8,0(r12) /* get tag */ 756975a783SMichael Ellerman cmpwi r8,0 766975a783SMichael Ellerman beq 10f /* end of list */ 776975a783SMichael Ellerman cmpwi r8,RELA 786975a783SMichael Ellerman bne 11f 796975a783SMichael Ellerman lwz r9,4(r12) /* get RELA pointer in r9 */ 806975a783SMichael Ellerman b 12f 816975a783SMichael Ellerman11: addis r8,r8,(-RELACOUNT)@ha 826975a783SMichael Ellerman cmpwi r8,RELACOUNT@l 836975a783SMichael Ellerman bne 12f 846975a783SMichael Ellerman lwz r0,4(r12) /* get RELACOUNT value in r0 */ 856975a783SMichael Ellerman12: addi r12,r12,8 866975a783SMichael Ellerman b 9b 876975a783SMichael Ellerman 886975a783SMichael Ellerman /* The relocation section contains a list of relocations. 896975a783SMichael Ellerman * We now do the R_PPC_RELATIVE ones, which point to words 906975a783SMichael Ellerman * which need to be initialized with addend + offset. 916975a783SMichael Ellerman * The R_PPC_RELATIVE ones come first and there are RELACOUNT 926975a783SMichael Ellerman * of them. */ 936975a783SMichael Ellerman10: /* skip relocation if we don't have both */ 946975a783SMichael Ellerman cmpwi r0,0 9568643cfbSOlaf Hering beq 3f 966975a783SMichael Ellerman cmpwi r9,0 976975a783SMichael Ellerman beq 3f 986975a783SMichael Ellerman 996975a783SMichael Ellerman add r9,r9,r11 /* Relocate RELA pointer */ 1006975a783SMichael Ellerman mtctr r0 1016975a783SMichael Ellerman2: lbz r0,4+3(r9) /* ELF32_R_INFO(reloc->r_info) */ 1026975a783SMichael Ellerman cmpwi r0,22 /* R_PPC_RELATIVE */ 1036975a783SMichael Ellerman bne 3f 1046975a783SMichael Ellerman lwz r12,0(r9) /* reloc->r_offset */ 1056975a783SMichael Ellerman lwz r0,8(r9) /* reloc->r_addend */ 1066975a783SMichael Ellerman add r0,r0,r11 1076975a783SMichael Ellerman stwx r0,r11,r12 1086975a783SMichael Ellerman addi r9,r9,12 10968643cfbSOlaf Hering bdnz 2b 11094b212c2SPaul Mackerras 111cd197ffcSDavid Gibson /* Do a cache flush for our text, in case the loader didn't */ 1126975a783SMichael Ellerman3: lwz r9,p_start-p_base(r10) /* note: these are relocated now */ 1136975a783SMichael Ellerman lwz r8,p_etext-p_base(r10) 11468643cfbSOlaf Hering4: dcbf r0,r9 11594b212c2SPaul Mackerras icbi r0,r9 11694b212c2SPaul Mackerras addi r9,r9,0x20 117eacb1962SOlaf Hering cmplw cr0,r9,r8 11868643cfbSOlaf Hering blt 4b 11994b212c2SPaul Mackerras sync 12094b212c2SPaul Mackerras isync 12194b212c2SPaul Mackerras 122cd197ffcSDavid Gibson /* Clear the BSS */ 1236975a783SMichael Ellerman lwz r9,p_bss_start-p_base(r10) 1246975a783SMichael Ellerman lwz r8,p_end-p_base(r10) 1256975a783SMichael Ellerman li r0,0 1266975a783SMichael Ellerman5: stw r0,0(r9) 127cd197ffcSDavid Gibson addi r9,r9,4 128cd197ffcSDavid Gibson cmplw cr0,r9,r8 129cd197ffcSDavid Gibson blt 5b 13094b212c2SPaul Mackerras 131cd197ffcSDavid Gibson /* Possibly set up a custom stack */ 1326975a783SMichael Ellerman lwz r8,p_pstack-p_base(r10) 133cd197ffcSDavid Gibson cmpwi r8,0 134cd197ffcSDavid Gibson beq 6f 135cd197ffcSDavid Gibson lwz r1,0(r8) 136cd197ffcSDavid Gibson li r0,0 137cd197ffcSDavid Gibson stwu r0,-16(r1) /* establish a stack frame */ 138cd197ffcSDavid Gibson6: 139f16e9684SCédric Le Goater#else /* __powerpc64__ */ 140f16e9684SCédric Le Goater /* Save the prom pointer at p_prom. */ 141f16e9684SCédric Le Goater std r5,(p_prom-p_base)(r10) 142cd197ffcSDavid Gibson 143f16e9684SCédric Le Goater /* Set r2 to the TOC. */ 144f16e9684SCédric Le Goater ld r2,(p_toc-p_base)(r10) 145f16e9684SCédric Le Goater add r2,r2,r10 146f16e9684SCédric Le Goater 147f16e9684SCédric Le Goater /* Grab the link address of the dynamic section in r11. */ 148f16e9684SCédric Le Goater ld r11,-32768(r2) 149f16e9684SCédric Le Goater cmpwi r11,0 150f16e9684SCédric Le Goater beq 3f /* if not linked -pie then no dynamic section */ 151f16e9684SCédric Le Goater 152f16e9684SCédric Le Goater ld r11,(p_dyn-p_base)(r10) 153f16e9684SCédric Le Goater add r11,r11,r10 154f16e9684SCédric Le Goater ld r9,(p_rela-p_base)(r10) 155f16e9684SCédric Le Goater add r9,r9,r10 156f16e9684SCédric Le Goater 1577f664cf9SJeremy Kerr li r13,0 158f16e9684SCédric Le Goater li r8,0 1597f664cf9SJeremy Kerr9: ld r12,0(r11) /* get tag */ 1607f664cf9SJeremy Kerr cmpdi r12,0 161f16e9684SCédric Le Goater beq 12f /* end of list */ 1627f664cf9SJeremy Kerr cmpdi r12,RELA 163f16e9684SCédric Le Goater bne 10f 1647f664cf9SJeremy Kerr ld r13,8(r11) /* get RELA pointer in r13 */ 165f16e9684SCédric Le Goater b 11f 1667f664cf9SJeremy Kerr10: addis r12,r12,(-RELACOUNT)@ha 1677f664cf9SJeremy Kerr cmpdi r12,RELACOUNT@l 168f16e9684SCédric Le Goater bne 11f 169f16e9684SCédric Le Goater ld r8,8(r11) /* get RELACOUNT value in r8 */ 170f16e9684SCédric Le Goater11: addi r11,r11,16 171f16e9684SCédric Le Goater b 9b 172f16e9684SCédric Le Goater12: 1737f664cf9SJeremy Kerr cmpdi r13,0 /* check we have both RELA and RELACOUNT */ 174f16e9684SCédric Le Goater cmpdi cr1,r8,0 175f16e9684SCédric Le Goater beq 3f 176f16e9684SCédric Le Goater beq cr1,3f 177f16e9684SCédric Le Goater 178f16e9684SCédric Le Goater /* Calcuate the runtime offset. */ 1797f664cf9SJeremy Kerr subf r13,r13,r9 180f16e9684SCédric Le Goater 181f16e9684SCédric Le Goater /* Run through the list of relocations and process the 182f16e9684SCédric Le Goater * R_PPC64_RELATIVE ones. */ 183f16e9684SCédric Le Goater mtctr r8 184f16e9684SCédric Le Goater13: ld r0,8(r9) /* ELF64_R_TYPE(reloc->r_info) */ 185f16e9684SCédric Le Goater cmpdi r0,22 /* R_PPC64_RELATIVE */ 186f16e9684SCédric Le Goater bne 3f 1877f664cf9SJeremy Kerr ld r12,0(r9) /* reloc->r_offset */ 188f16e9684SCédric Le Goater ld r0,16(r9) /* reloc->r_addend */ 1897f664cf9SJeremy Kerr add r0,r0,r13 1907f664cf9SJeremy Kerr stdx r0,r13,r12 191f16e9684SCédric Le Goater addi r9,r9,24 192f16e9684SCédric Le Goater bdnz 13b 193f16e9684SCédric Le Goater 194f16e9684SCédric Le Goater /* Do a cache flush for our text, in case the loader didn't */ 195f16e9684SCédric Le Goater3: ld r9,p_start-p_base(r10) /* note: these are relocated now */ 196f16e9684SCédric Le Goater ld r8,p_etext-p_base(r10) 197f16e9684SCédric Le Goater4: dcbf r0,r9 198f16e9684SCédric Le Goater icbi r0,r9 199f16e9684SCédric Le Goater addi r9,r9,0x20 200f16e9684SCédric Le Goater cmpld cr0,r9,r8 201f16e9684SCédric Le Goater blt 4b 202f16e9684SCédric Le Goater sync 203f16e9684SCédric Le Goater isync 204f16e9684SCédric Le Goater 205f16e9684SCédric Le Goater /* Clear the BSS */ 206f16e9684SCédric Le Goater ld r9,p_bss_start-p_base(r10) 207f16e9684SCédric Le Goater ld r8,p_end-p_base(r10) 208f16e9684SCédric Le Goater li r0,0 209f16e9684SCédric Le Goater5: std r0,0(r9) 210f16e9684SCédric Le Goater addi r9,r9,8 211f16e9684SCédric Le Goater cmpld cr0,r9,r8 212f16e9684SCédric Le Goater blt 5b 213f16e9684SCédric Le Goater 214f16e9684SCédric Le Goater /* Possibly set up a custom stack */ 215f16e9684SCédric Le Goater ld r8,p_pstack-p_base(r10) 216f16e9684SCédric Le Goater cmpdi r8,0 217f16e9684SCédric Le Goater beq 6f 218f16e9684SCédric Le Goater ld r1,0(r8) 219f16e9684SCédric Le Goater li r0,0 2208c06f0d9SJeremy Kerr stdu r0,-112(r1) /* establish a stack frame */ 221f16e9684SCédric Le Goater6: 222f16e9684SCédric Le Goater#endif /* __powerpc64__ */ 223cd197ffcSDavid Gibson /* Call platform_init() */ 224cd197ffcSDavid Gibson bl platform_init 225cd197ffcSDavid Gibson 226cd197ffcSDavid Gibson /* Call start */ 227cd197ffcSDavid Gibson b start 22893d39210SCédric Le Goater 22993d39210SCédric Le Goater#ifdef __powerpc64__ 23093d39210SCédric Le Goater 23193d39210SCédric Le Goater#define PROM_FRAME_SIZE 512 23293d39210SCédric Le Goater#define SAVE_GPR(n, base) std n,8*(n)(base) 23393d39210SCédric Le Goater#define REST_GPR(n, base) ld n,8*(n)(base) 23493d39210SCédric Le Goater#define SAVE_2GPRS(n, base) SAVE_GPR(n, base); SAVE_GPR(n+1, base) 23593d39210SCédric Le Goater#define SAVE_4GPRS(n, base) SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base) 23693d39210SCédric Le Goater#define SAVE_8GPRS(n, base) SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base) 23793d39210SCédric Le Goater#define SAVE_10GPRS(n, base) SAVE_8GPRS(n, base); SAVE_2GPRS(n+8, base) 23893d39210SCédric Le Goater#define REST_2GPRS(n, base) REST_GPR(n, base); REST_GPR(n+1, base) 23993d39210SCédric Le Goater#define REST_4GPRS(n, base) REST_2GPRS(n, base); REST_2GPRS(n+2, base) 24093d39210SCédric Le Goater#define REST_8GPRS(n, base) REST_4GPRS(n, base); REST_4GPRS(n+4, base) 24193d39210SCédric Le Goater#define REST_10GPRS(n, base) REST_8GPRS(n, base); REST_2GPRS(n+8, base) 24293d39210SCédric Le Goater 24393d39210SCédric Le Goater/* prom handles the jump into and return from firmware. The prom args pointer 24493d39210SCédric Le Goater is loaded in r3. */ 24593d39210SCédric Le Goater.globl prom 24693d39210SCédric Le Goaterprom: 24793d39210SCédric Le Goater mflr r0 24893d39210SCédric Le Goater std r0,16(r1) 24993d39210SCédric Le Goater stdu r1,-PROM_FRAME_SIZE(r1) /* Save SP and create stack space */ 25093d39210SCédric Le Goater 25193d39210SCédric Le Goater SAVE_GPR(2, r1) 25293d39210SCédric Le Goater SAVE_GPR(13, r1) 25393d39210SCédric Le Goater SAVE_8GPRS(14, r1) 25493d39210SCédric Le Goater SAVE_10GPRS(22, r1) 25593d39210SCédric Le Goater mfcr r10 25693d39210SCédric Le Goater std r10,8*32(r1) 25793d39210SCédric Le Goater mfmsr r10 25893d39210SCédric Le Goater std r10,8*33(r1) 25993d39210SCédric Le Goater 26093d39210SCédric Le Goater /* remove MSR_LE from msr but keep MSR_SF */ 26193d39210SCédric Le Goater mfmsr r10 26293d39210SCédric Le Goater rldicr r10,r10,0,62 26393d39210SCédric Le Goater mtsrr1 r10 26493d39210SCédric Le Goater 26593d39210SCédric Le Goater /* Load FW address, set LR to label 1, and jump to FW */ 26693d39210SCédric Le Goater bl 0f 26793d39210SCédric Le Goater0: mflr r10 26893d39210SCédric Le Goater addi r11,r10,(1f-0b) 26993d39210SCédric Le Goater mtlr r11 27093d39210SCédric Le Goater 27193d39210SCédric Le Goater ld r10,(p_prom-0b)(r10) 27293d39210SCédric Le Goater mtsrr0 r10 27393d39210SCédric Le Goater 27493d39210SCédric Le Goater rfid 27593d39210SCédric Le Goater 27693d39210SCédric Le Goater1: /* Return from OF */ 277147c0516SCédric Le Goater FIXUP_ENDIAN 27893d39210SCédric Le Goater 27993d39210SCédric Le Goater /* Restore registers and return. */ 28093d39210SCédric Le Goater rldicl r1,r1,0,32 28193d39210SCédric Le Goater 28293d39210SCédric Le Goater /* Restore the MSR (back to 64 bits) */ 28393d39210SCédric Le Goater ld r10,8*(33)(r1) 28493d39210SCédric Le Goater mtmsr r10 28593d39210SCédric Le Goater isync 28693d39210SCédric Le Goater 28793d39210SCédric Le Goater /* Restore other registers */ 28893d39210SCédric Le Goater REST_GPR(2, r1) 28993d39210SCédric Le Goater REST_GPR(13, r1) 29093d39210SCédric Le Goater REST_8GPRS(14, r1) 29193d39210SCédric Le Goater REST_10GPRS(22, r1) 29293d39210SCédric Le Goater ld r10,8*32(r1) 29393d39210SCédric Le Goater mtcr r10 29493d39210SCédric Le Goater 29593d39210SCédric Le Goater addi r1,r1,PROM_FRAME_SIZE 29693d39210SCédric Le Goater ld r0,16(r1) 29793d39210SCédric Le Goater mtlr r0 29893d39210SCédric Le Goater blr 29993d39210SCédric Le Goater#endif 300