diff options
| -rw-r--r-- | arch/powerpc/Kconfig | 13 | ||||
| -rw-r--r-- | arch/powerpc/Makefile | 4 | ||||
| -rw-r--r-- | arch/powerpc/boot/Makefile | 3 | ||||
| -rw-r--r-- | arch/powerpc/boot/elf_util.c | 6 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/mmu-hash64.h | 2 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/page.h | 14 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/sections.h | 6 | ||||
| -rw-r--r-- | arch/powerpc/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/powerpc/kernel/head_64.S | 26 | ||||
| -rw-r--r-- | arch/powerpc/kernel/paca.c | 3 | ||||
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 3 | ||||
| -rw-r--r-- | arch/powerpc/kernel/prom_init.c | 11 | ||||
| -rw-r--r-- | arch/powerpc/kernel/reloc_64.S | 87 | ||||
| -rw-r--r-- | arch/powerpc/kernel/vmlinux.lds.S | 15 | ||||
| -rw-r--r-- | arch/powerpc/mm/hash_utils_64.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powermac/smp.c | 4 |
16 files changed, 181 insertions, 19 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 587da5e..17c988b 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -806,6 +806,19 @@ config PIN_TLB endmenu if PPC64 +config RELOCATABLE + bool "Build a relocatable kernel" + help + This builds a kernel image that is capable of running anywhere + in the RMA (real memory area) at any 16k-aligned base address. + The kernel is linked as a position-independent executable (PIE) + and contains dynamic relocations which are processed early + in the bootup process. + + One use is for the kexec on panic case where the recovery kernel + must live at a different physical address than the primary + kernel. + config PAGE_OFFSET hex default "0xc000000000000000" diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index c6be19e..4df38cb 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -63,7 +63,9 @@ override CC += -m$(CONFIG_WORD_SIZE) override AR := GNUTARGET=elf$(CONFIG_WORD_SIZE)-powerpc $(AR) endif -LDFLAGS_vmlinux := -Bstatic +LDFLAGS_vmlinux-yy := -Bstatic +LDFLAGS_vmlinux-$(CONFIG_PPC64)$(CONFIG_RELOCATABLE) := -pie +LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-yy) CFLAGS-$(CONFIG_PPC64) := -mminimal-toc -mtraceback=none -mcall-aixdesc CFLAGS-$(CONFIG_PPC32) := -ffixed-r2 -mmultiple diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile index 717a3bc..6403275 100644 --- a/arch/powerpc/boot/Makefile +++ b/arch/powerpc/boot/Makefile @@ -310,8 +310,11 @@ $(obj)/dtbImage.%: vmlinux $(wrapperbits) $(obj)/%.dtb $(obj)/vmlinux.strip: vmlinux $(STRIP) -s -R .comment $< -o $@ +# The iseries hypervisor won't take an ET_DYN executable, so this +# changes the type (byte 17) in the file to ET_EXEC (2). $(obj)/zImage.iseries: vmlinux $(STRIP) -s -R .comment $< -o $@ + printf "\x02" | dd of=$@ conv=notrunc bs=1 seek=17 $(obj)/uImage: vmlinux $(wrapperbits) $(call if_changed,wrap,uboot) diff --git a/arch/powerpc/boot/elf_util.c b/arch/powerpc/boot/elf_util.c index 7454aa4..1567a0c 100644 --- a/arch/powerpc/boot/elf_util.c +++ b/arch/powerpc/boot/elf_util.c @@ -27,7 +27,8 @@ int parse_elf64(void *hdr, struct elf_info *info) elf64->e_ident[EI_MAG3] == ELFMAG3 && elf64->e_ident[EI_CLASS] == ELFCLASS64 && elf64->e_ident[EI_DATA] == ELFDATA2MSB && - elf64->e_type == ET_EXEC && + (elf64->e_type == ET_EXEC || + elf64->e_type == ET_DYN) && elf64->e_machine == EM_PPC64)) return 0; @@ -58,7 +59,8 @@ int parse_elf32(void *hdr, struct elf_info *info) elf32->e_ident[EI_MAG3] == ELFMAG3 && elf32->e_ident[EI_CLASS] == ELFCLASS32 && elf32->e_ident[EI_DATA] == ELFDATA2MSB && - elf32->e_type == ET_EXEC && + (elf32->e_type == ET_EXEC || + elf32->e_type == ET_DYN) && elf32->e_machine == EM_PPC)) return 0; diff --git a/arch/powerpc/include/asm/mmu-hash64.h b/arch/powerpc/include/asm/mmu-hash64.h index c2df53c..5a44174 100644 --- a/arch/powerpc/include/asm/mmu-hash64.h +++ b/arch/powerpc/include/asm/mmu-hash64.h @@ -437,7 +437,7 @@ typedef struct { }) #endif /* 1 */ -/* This is only valid for addresses >= KERNELBASE */ +/* This is only valid for addresses >= PAGE_OFFSET */ static inline unsigned long get_kernel_vsid(unsigned long ea, int ssize) { if (ssize == MMU_SEGSIZE_256M) diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h index e088545..64e1445 100644 --- a/arch/powerpc/include/asm/page.h +++ b/arch/powerpc/include/asm/page.h @@ -71,15 +71,21 @@ #define PAGE_OFFSET ASM_CONST(CONFIG_PAGE_OFFSET) #define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START)) -#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_FLATMEM) +#if defined(CONFIG_RELOCATABLE) #ifndef __ASSEMBLY__ extern phys_addr_t memstart_addr; extern phys_addr_t kernstart_addr; #endif #define PHYSICAL_START kernstart_addr -#define MEMORY_START memstart_addr #else #define PHYSICAL_START ASM_CONST(CONFIG_PHYSICAL_START) +#endif + +#ifdef CONFIG_PPC64 +#define MEMORY_START 0UL +#elif defined(CONFIG_RELOCATABLE) +#define MEMORY_START memstart_addr +#else #define MEMORY_START (PHYSICAL_START + PAGE_OFFSET - KERNELBASE) #endif @@ -92,8 +98,8 @@ extern phys_addr_t kernstart_addr; #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) -#define __va(x) ((void *)((unsigned long)(x) - PHYSICAL_START + KERNELBASE)) -#define __pa(x) ((unsigned long)(x) + PHYSICAL_START - KERNELBASE) +#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - MEMORY_START)) +#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START) /* * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI, diff --git a/arch/powerpc/include/asm/sections.h b/arch/powerpc/include/asm/sections.h index 7710e9e..baf318a 100644 --- a/arch/powerpc/include/asm/sections.h +++ b/arch/powerpc/include/asm/sections.h @@ -16,6 +16,12 @@ static inline int in_kernel_text(unsigned long addr) return 0; } +static inline int overlaps_kernel_text(unsigned long start, unsigned long end) +{ + return start < (unsigned long)__init_end && + (unsigned long)_stext < end; +} + #undef dereference_function_descriptor void *dereference_function_descriptor(void *); diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index 49b49c0..16326fd 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -35,6 +35,7 @@ obj-$(CONFIG_PPC64) += setup_64.o sys_ppc32.o \ paca.o cpu_setup_ppc970.o \ cpu_setup_pa6t.o \ firmware.o nvram_64.o +obj64-$(CONFIG_RELOCATABLE) += reloc_64.o obj-$(CONFIG_PPC64) += vdso64/ obj-$(CONFIG_ALTIVEC) += vecemu.o vector.o obj-$(CONFIG_PPC_970_NAP) += idle_power4.o diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index 6cdfd44..84856be 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -1360,6 +1360,12 @@ _INIT_STATIC(__boot_from_prom) */ rldicr r1,r1,0,59 +#ifdef CONFIG_RELOCATABLE + /* Relocate code for where we are now */ + mr r3,r26 + bl .relocate +#endif + /* Restore parameters */ mr r3,r31 mr r4,r30 @@ -1368,11 +1374,19 @@ _INIT_STATIC(__boot_from_prom) mr r7,r27 /* Do all of the interaction with OF client interface */ + mr r8,r26 bl .prom_init /* We never return */ trap _STATIC(__after_prom_start) +#ifdef CONFIG_RELOCATABLE + /* process relocations for the final address of the kernel */ + lis r25,PAGE_OFFSET@highest /* compute virtual base of kernel */ + sldi r25,r25,32 + mr r3,r25 + bl .relocate +#endif /* * We need to run with _stext at physical address PHYSICAL_START. @@ -1381,10 +1395,9 @@ _STATIC(__after_prom_start) * * Note: This process overwrites the OF exception vectors. */ - LOAD_REG_IMMEDIATE(r3, PHYSICAL_START) /* target addr */ - cmpd r3,r26 /* In some cases the loader may */ + li r3,0 /* target addr */ + mr. r4,r26 /* In some cases the loader may */ beq 9f /* have already put us at zero */ - mr r4,r26 /* source address */ lis r5,(copy_to_here - _stext)@ha addi r5,r5,(copy_to_here - _stext)@l /* # bytes of memory to copy */ li r6,0x100 /* Start offset, the first 0x100 */ @@ -1617,6 +1630,13 @@ _INIT_STATIC(start_here_multiplatform) ori r6,r6,MSR_RI mtmsrd r6 /* RI on */ +#ifdef CONFIG_RELOCATABLE + /* Save the physical address we're running at in kernstart_addr */ + LOAD_REG_ADDR(r4, kernstart_addr) + clrldi r0,r25,2 + std r0,0(r4) +#endif + /* The following gets the stack set up with the regs */ /* pointing to the real addr of the kernel stack. This is */ /* all done to support the C function call below which sets */ diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c index 623e8c3..48a3471 100644 --- a/arch/powerpc/kernel/paca.c +++ b/arch/powerpc/kernel/paca.c @@ -12,6 +12,7 @@ #include <asm/lppaca.h> #include <asm/paca.h> +#include <asm/sections.h> /* This symbol is provided by the linker - let it fill in the paca * field correctly */ @@ -79,7 +80,7 @@ void __init initialise_pacas(void) new_paca->lock_token = 0x8000; new_paca->paca_index = cpu; new_paca->kernel_toc = kernel_toc; - new_paca->kernelbase = KERNELBASE; + new_paca->kernelbase = (unsigned long) _stext; new_paca->kernel_msr = MSR_KERNEL; new_paca->hw_cpu_id = 0xffff; new_paca->slb_shadow_ptr = &slb_shadow[cpu]; diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 09455e1..3a2dc7e 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -1192,6 +1192,9 @@ void __init early_init_devtree(void *params) /* Reserve LMB regions used by kernel, initrd, dt, etc... */ lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START); + /* If relocatable, reserve first 32k for interrupt vectors etc. */ + if (PHYSICAL_START > MEMORY_START) + lmb_reserve(MEMORY_START, 0x8000); reserve_kdump_trampoline(); reserve_crashkernel(); early_reserve_mem(); diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c index 1f89885..7cf274a 100644 --- a/arch/powerpc/kernel/prom_init.c +++ b/arch/powerpc/kernel/prom_init.c @@ -2309,13 +2309,14 @@ static void __init prom_check_initrd(unsigned long r3, unsigned long r4) unsigned long __init prom_init(unsigned long r3, unsigned long r4, unsigned long pp, - unsigned long r6, unsigned long r7) + unsigned long r6, unsigned long r7, + unsigned long kbase) { struct prom_t *_prom; unsigned long hdr; - unsigned long offset = reloc_offset(); #ifdef CONFIG_PPC32 + unsigned long offset = reloc_offset(); reloc_got2(offset); #endif @@ -2349,9 +2350,11 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4, */ RELOC(of_platform) = prom_find_machine_type(); +#ifndef CONFIG_RELOCATABLE /* Bail if this is a kdump kernel. */ if (PHYSICAL_START > 0) prom_panic("Error: You can't boot a kdump kernel from OF!\n"); +#endif /* * Check for an initrd @@ -2371,7 +2374,7 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4, * Copy the CPU hold code */ if (RELOC(of_platform) != PLATFORM_POWERMAC) - copy_and_flush(0, KERNELBASE + offset, 0x100, 0); + copy_and_flush(0, kbase, 0x100, 0); /* * Do early parsing of command line @@ -2474,7 +2477,7 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4, reloc_got2(-offset); #endif - __start(hdr, KERNELBASE + offset, 0); + __start(hdr, kbase, 0); return 0; } diff --git a/arch/powerpc/kernel/reloc_64.S b/arch/powerpc/kernel/reloc_64.S new file mode 100644 index 0000000..b47a0e1 --- /dev/null +++ b/arch/powerpc/kernel/reloc_64.S @@ -0,0 +1,87 @@ +/* + * Code to process dynamic relocations in the kernel. + * + * Copyright 2008 Paul Mackerras, IBM Corp. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <asm/ppc_asm.h> + +RELA = 7 +RELACOUNT = 0x6ffffff9 +R_PPC64_RELATIVE = 22 + +/* + * r3 = desired final address of kernel + */ +_GLOBAL(relocate) + mflr r0 + bcl 20,31,$+4 +0: mflr r12 /* r12 has runtime addr of label 0 */ + mtlr r0 + ld r11,(p_dyn - 0b)(r12) + add r11,r11,r12 /* r11 has runtime addr of .dynamic section */ + ld r9,(p_rela - 0b)(r12) + add r9,r9,r12 /* r9 has runtime addr of .rela.dyn section */ + ld r10,(p_st - 0b)(r12) + add r10,r10,r12 /* r10 has runtime addr of _stext */ + + /* + * Scan the dynamic section for the RELA and RELACOUNT entries. + */ + li r7,0 + li r8,0 +1: ld r6,0(r11) /* get tag */ + cmpdi r6,0 + beq 4f /* end of list */ + cmpdi r6,RELA + bne 2f + ld r7,8(r11) /* get RELA pointer in r7 */ + b 3f +2: addis r6,r6,(-RELACOUNT)@ha + cmpdi r6,RELACOUNT@l + bne 3f + ld r8,8(r11) /* get RELACOUNT value in r8 */ +3: addi r11,r11,16 + b 1b +4: cmpdi r7,0 /* check we have both RELA and RELACOUNT */ + cmpdi cr1,r8,0 + beq 6f + beq cr1,6f + + /* + * Work out linktime address of _stext and hence the + * relocation offset to be applied. + * cur_offset [r7] = rela.run [r9] - rela.link [r7] + * _stext.link [r10] = _stext.run [r10] - cur_offset [r7] + * final_offset [r3] = _stext.final [r3] - _stext.link [r10] + */ + subf r7,r7,r9 /* cur_offset */ + subf r10,r7,r10 + subf r3,r10,r3 /* final_offset */ + + /* + * Run through the list of relocations and process the + * R_PPC64_RELATIVE ones. + */ + mtctr r8 +5: lwz r0,12(9) /* ELF64_R_TYPE(reloc->r_info) */ + cmpwi r0,R_PPC64_RELATIVE + bne 6f + ld r6,0(r9) /* reloc->r_offset */ + ld r0,16(r9) /* reloc->r_addend */ + add r0,r0,r3 + stdx r0,r7,r6 + addi r9,r9,24 + bdnz 5b + +6: blr + +p_dyn: .llong __dynamic_start - 0b +p_rela: .llong __rela_dyn_start - 0b +p_st: .llong _stext - 0b + diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S index 9f6c1ca..e6927fb 100644 --- a/arch/powerpc/kernel/vmlinux.lds.S +++ b/arch/powerpc/kernel/vmlinux.lds.S @@ -187,6 +187,21 @@ SECTIONS *(.machine.desc) __machine_desc_end = . ; } + . = ALIGN(8); + .dynsym : AT(ADDR(.dynsym) - LOAD_OFFSET) { *(.dynsym) } + .dynstr : AT(ADDR(.dynstr) - LOAD_OFFSET) { *(.dynstr) } + .dynamic : AT(ADDR(.dynamic) - LOAD_OFFSET) + { + __dynamic_start = .; + *(.dynamic) + } + .hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) } + .interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) } + .rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET) + { + __rela_dyn_start = .; + *(.rela*) + } /* freed after init ends here */ . = ALIGN(PAGE_SIZE); diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index d666f71..09db4ef 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -194,7 +194,7 @@ int htab_bolt_mapping(unsigned long vstart, unsigned long vend, unsigned long tprot = prot; /* Make kernel text executable */ - if (in_kernel_text(vaddr)) + if (overlaps_kernel_text(vaddr, vaddr + step)) tprot &= ~HPTE_R_N; hash = hpt_hash(va, shift, ssize); diff --git a/arch/powerpc/platforms/powermac/smp.c b/arch/powerpc/platforms/powermac/smp.c index 4ae3d00..40f72c2 100644 --- a/arch/powerpc/platforms/powermac/smp.c +++ b/arch/powerpc/platforms/powermac/smp.c @@ -787,7 +787,7 @@ static void __devinit smp_core99_kick_cpu(int nr) { unsigned int save_vector; unsigned long target, flags; - unsigned int *vector = (unsigned int *)(KERNELBASE+0x100); + unsigned int *vector = (unsigned int *)(PAGE_OFFSET+0x100); if (nr < 0 || nr > 3) return; @@ -801,7 +801,7 @@ static void __devinit smp_core99_kick_cpu(int nr) save_vector = *vector; /* Setup fake reset vector that does - * b __secondary_start_pmac_0 + nr*8 - KERNELBASE + * b __secondary_start_pmac_0 + nr*8 */ target = (unsigned long) __secondary_start_pmac_0 + nr * 8; patch_branch(vector, target, BRANCH_SET_LINK); |