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Message-ID: <CAMj1kXHTQSfsr8m86zGZCp1cvp9_kOpOe6P1MjjjSh72HZ8PSg@mail.gmail.com> Date: Mon, 7 Apr 2025 11:30:25 +0300 From: Ard Biesheuvel <ardb@...nel.org> To: "Aithal, Srikanth" <sraithal@....com> Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>, David Woodhouse <dwmw@...zon.co.uk>, "H. Peter Anvin" <hpa@...or.com>, Kees Cook <keescook@...omium.org>, x86@...nel.org Subject: Re: [tip: x86/boot] x86/boot: Move the EFI mixed mode startup code back under arch/x86, into startup/ On Mon, 7 Apr 2025 at 10:38, Aithal, Srikanth <sraithal@....com> wrote: > > Hello, > > This commit breaks the build of next-20250407. The kernel config is > attached here. > > Build error: > > arch/x86/boot/startup/efi-mixed.o: warning: objtool: > efi32_stub_entry+0x0: unannotated intra-function call > make[3]: *** [scripts/Makefile.build:335: > arch/x86/boot/startup/efi-mixed.o] Error 255 > make[3]: *** Deleting file 'arch/x86/boot/startup/efi-mixed.o' > make[3]: *** Waiting for unfinished jobs.... > make[2]: *** [scripts/Makefile.build:461: arch/x86/boot/startup] Error 2 > make[2]: *** Waiting for unfinished jobs.... > make[1]: *** [/home/VT_BUILD/linux/Makefile:2006: .] Error 2 > make: *** [Makefile:248: __sub-make] Error 2 > > Apologies for the breakage. Does it help to add the following to arch/x86/boot/startup/Makefile: OBJECT_FILES_NON_STANDARD := y ? > > Thanks, > Srikanth Aithal <sraithal@....com> > > > On 4/7/2025 12:03 AM, tip-bot2 for Ard Biesheuvel wrote: > > The following commit has been merged into the x86/boot branch of tip: > > > > Commit-ID: 4f2d1bbc2c92a32fd612e6c3b51832d5c1c3678e > > Gitweb: https://git.kernel.org/tip/4f2d1bbc2c92a32fd612e6c3b51832d5c1c3678e > > Author: Ard Biesheuvel <ardb@...nel.org> > > AuthorDate: Tue, 01 Apr 2025 15:34:20 +02:00 > > Committer: Ingo Molnar <mingo@...nel.org> > > CommitterDate: Sun, 06 Apr 2025 20:15:14 +02:00 > > > > x86/boot: Move the EFI mixed mode startup code back under arch/x86, into startup/ > > > > Linus expressed a strong preference for arch-specific asm code (i.e., > > virtually all of it) to reside under arch/ rather than anywhere else. > > > > So move the EFI mixed mode startup code back, and put it under > > arch/x86/boot/startup/ where all shared x86 startup code is going to > > live. > > > > Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org> > > Signed-off-by: Ard Biesheuvel <ardb@...nel.org> > > Signed-off-by: Ingo Molnar <mingo@...nel.org> > > Cc: David Woodhouse <dwmw@...zon.co.uk> > > Cc: H. Peter Anvin <hpa@...or.com> > > Cc: Kees Cook <keescook@...omium.org> > > Link: https://lore.kernel.org/r/20250401133416.1436741-11-ardb+git@google.com > > --- > > arch/x86/boot/startup/Makefile | 3 +- > > arch/x86/boot/startup/efi-mixed.S | 253 ++++++++++++++++++++++- > > drivers/firmware/efi/libstub/Makefile | 1 +- > > drivers/firmware/efi/libstub/x86-mixed.S | 253 +---------------------- > > 4 files changed, 256 insertions(+), 254 deletions(-) > > create mode 100644 arch/x86/boot/startup/efi-mixed.S > > delete mode 100644 drivers/firmware/efi/libstub/x86-mixed.S > > > > diff --git a/arch/x86/boot/startup/Makefile b/arch/x86/boot/startup/Makefile > > index 03519ef..73946a3 100644 > > --- a/arch/x86/boot/startup/Makefile > > +++ b/arch/x86/boot/startup/Makefile > > @@ -1,3 +1,6 @@ > > # SPDX-License-Identifier: GPL-2.0 > > > > +KBUILD_AFLAGS += -D__DISABLE_EXPORTS > > + > > lib-$(CONFIG_X86_64) += la57toggle.o > > +lib-$(CONFIG_EFI_MIXED) += efi-mixed.o > > diff --git a/arch/x86/boot/startup/efi-mixed.S b/arch/x86/boot/startup/efi-mixed.S > > new file mode 100644 > > index 0000000..e04ed99 > > --- /dev/null > > +++ b/arch/x86/boot/startup/efi-mixed.S > > @@ -0,0 +1,253 @@ > > +/* SPDX-License-Identifier: GPL-2.0 */ > > +/* > > + * Copyright (C) 2014, 2015 Intel Corporation; author Matt Fleming > > + * > > + * Early support for invoking 32-bit EFI services from a 64-bit kernel. > > + * > > + * Because this thunking occurs before ExitBootServices() we have to > > + * restore the firmware's 32-bit GDT and IDT before we make EFI service > > + * calls. > > + * > > + * On the plus side, we don't have to worry about mangling 64-bit > > + * addresses into 32-bits because we're executing with an identity > > + * mapped pagetable and haven't transitioned to 64-bit virtual addresses > > + * yet. > > + */ > > + > > +#include <linux/linkage.h> > > +#include <asm/desc_defs.h> > > +#include <asm/msr.h> > > +#include <asm/page_types.h> > > +#include <asm/pgtable_types.h> > > +#include <asm/processor-flags.h> > > +#include <asm/segment.h> > > + > > + .text > > + .code32 > > +#ifdef CONFIG_EFI_HANDOVER_PROTOCOL > > +SYM_FUNC_START(efi32_stub_entry) > > + call 1f > > +1: popl %ecx > > + > > + /* Clear BSS */ > > + xorl %eax, %eax > > + leal (_bss - 1b)(%ecx), %edi > > + leal (_ebss - 1b)(%ecx), %ecx > > + subl %edi, %ecx > > + shrl $2, %ecx > > + cld > > + rep stosl > > + > > + add $0x4, %esp /* Discard return address */ > > + movl 8(%esp), %ebx /* struct boot_params pointer */ > > + jmp efi32_startup > > +SYM_FUNC_END(efi32_stub_entry) > > +#endif > > + > > +/* > > + * Called using a far call from __efi64_thunk() below, using the x86_64 SysV > > + * ABI (except for R8/R9 which are inaccessible to 32-bit code - EAX/EBX are > > + * used instead). EBP+16 points to the arguments passed via the stack. > > + * > > + * The first argument (EDI) is a pointer to the boot service or protocol, to > > + * which the remaining arguments are passed, each truncated to 32 bits. > > + */ > > +SYM_FUNC_START_LOCAL(efi_enter32) > > + /* > > + * Convert x86-64 SysV ABI params to i386 ABI > > + */ > > + pushl 32(%ebp) /* Up to 3 args passed via the stack */ > > + pushl 24(%ebp) > > + pushl 16(%ebp) > > + pushl %ebx /* R9 */ > > + pushl %eax /* R8 */ > > + pushl %ecx > > + pushl %edx > > + pushl %esi > > + > > + /* Disable paging */ > > + movl %cr0, %eax > > + btrl $X86_CR0_PG_BIT, %eax > > + movl %eax, %cr0 > > + > > + /* Disable long mode via EFER */ > > + movl $MSR_EFER, %ecx > > + rdmsr > > + btrl $_EFER_LME, %eax > > + wrmsr > > + > > + call *%edi > > + > > + /* We must preserve return value */ > > + movl %eax, %edi > > + > > + call efi32_enable_long_mode > > + > > + addl $32, %esp > > + movl %edi, %eax > > + lret > > +SYM_FUNC_END(efi_enter32) > > + > > + .code64 > > +SYM_FUNC_START(__efi64_thunk) > > + push %rbp > > + movl %esp, %ebp > > + push %rbx > > + > > + /* Move args #5 and #6 into 32-bit accessible registers */ > > + movl %r8d, %eax > > + movl %r9d, %ebx > > + > > + lcalll *efi32_call(%rip) > > + > > + pop %rbx > > + pop %rbp > > + RET > > +SYM_FUNC_END(__efi64_thunk) > > + > > + .code32 > > +SYM_FUNC_START_LOCAL(efi32_enable_long_mode) > > + movl %cr4, %eax > > + btsl $(X86_CR4_PAE_BIT), %eax > > + movl %eax, %cr4 > > + > > + movl $MSR_EFER, %ecx > > + rdmsr > > + btsl $_EFER_LME, %eax > > + wrmsr > > + > > + /* Disable interrupts - the firmware's IDT does not work in long mode */ > > + cli > > + > > + /* Enable paging */ > > + movl %cr0, %eax > > + btsl $X86_CR0_PG_BIT, %eax > > + movl %eax, %cr0 > > + ret > > +SYM_FUNC_END(efi32_enable_long_mode) > > + > > +/* > > + * This is the common EFI stub entry point for mixed mode. It sets up the GDT > > + * and page tables needed for 64-bit execution, after which it calls the > > + * common 64-bit EFI entrypoint efi_stub_entry(). > > + * > > + * Arguments: 0(%esp) image handle > > + * 4(%esp) EFI system table pointer > > + * %ebx struct boot_params pointer (or NULL) > > + * > > + * Since this is the point of no return for ordinary execution, no registers > > + * are considered live except for the function parameters. [Note that the EFI > > + * stub may still exit and return to the firmware using the Exit() EFI boot > > + * service.] > > + */ > > +SYM_FUNC_START_LOCAL(efi32_startup) > > + movl %esp, %ebp > > + > > + subl $8, %esp > > + sgdtl (%esp) /* Save GDT descriptor to the stack */ > > + movl 2(%esp), %esi /* Existing GDT pointer */ > > + movzwl (%esp), %ecx /* Existing GDT limit */ > > + inc %ecx /* Existing GDT size */ > > + andl $~7, %ecx /* Ensure size is multiple of 8 */ > > + > > + subl %ecx, %esp /* Allocate new GDT */ > > + andl $~15, %esp /* Realign the stack */ > > + movl %esp, %edi /* New GDT address */ > > + leal 7(%ecx), %eax /* New GDT limit */ > > + pushw %cx /* Push 64-bit CS (for LJMP below) */ > > + pushl %edi /* Push new GDT address */ > > + pushw %ax /* Push new GDT limit */ > > + > > + /* Copy GDT to the stack and add a 64-bit code segment at the end */ > > + movl $GDT_ENTRY(DESC_CODE64, 0, 0xfffff) & 0xffffffff, (%edi,%ecx) > > + movl $GDT_ENTRY(DESC_CODE64, 0, 0xfffff) >> 32, 4(%edi,%ecx) > > + shrl $2, %ecx > > + cld > > + rep movsl /* Copy the firmware GDT */ > > + lgdtl (%esp) /* Switch to the new GDT */ > > + > > + call 1f > > +1: pop %edi > > + > > + /* Record mixed mode entry */ > > + movb $0x0, (efi_is64 - 1b)(%edi) > > + > > + /* Set up indirect far call to re-enter 32-bit mode */ > > + leal (efi32_call - 1b)(%edi), %eax > > + addl %eax, (%eax) > > + movw %cs, 4(%eax) > > + > > + /* Disable paging */ > > + movl %cr0, %eax > > + btrl $X86_CR0_PG_BIT, %eax > > + movl %eax, %cr0 > > + > > + /* Set up 1:1 mapping */ > > + leal (pte - 1b)(%edi), %eax > > + movl $_PAGE_PRESENT | _PAGE_RW | _PAGE_PSE, %ecx > > + leal (_PAGE_PRESENT | _PAGE_RW)(%eax), %edx > > +2: movl %ecx, (%eax) > > + addl $8, %eax > > + addl $PMD_SIZE, %ecx > > + jnc 2b > > + > > + movl $PAGE_SIZE, %ecx > > + .irpc l, 0123 > > + movl %edx, \l * 8(%eax) > > + addl %ecx, %edx > > + .endr > > + addl %ecx, %eax > > + movl %edx, (%eax) > > + movl %eax, %cr3 > > + > > + call efi32_enable_long_mode > > + > > + /* Set up far jump to 64-bit mode (CS is already on the stack) */ > > + leal (efi_stub_entry - 1b)(%edi), %eax > > + movl %eax, 2(%esp) > > + > > + movl 0(%ebp), %edi > > + movl 4(%ebp), %esi > > + movl %ebx, %edx > > + ljmpl *2(%esp) > > +SYM_FUNC_END(efi32_startup) > > + > > +/* > > + * efi_status_t efi32_pe_entry(efi_handle_t image_handle, > > + * efi_system_table_32_t *sys_table) > > + */ > > +SYM_FUNC_START(efi32_pe_entry) > > + pushl %ebx // save callee-save registers > > + > > + /* Check whether the CPU supports long mode */ > > + movl $0x80000001, %eax // assume extended info support > > + cpuid > > + btl $29, %edx // check long mode bit > > + jnc 1f > > + leal 8(%esp), %esp // preserve stack alignment > > + xor %ebx, %ebx // no struct boot_params pointer > > + jmp efi32_startup // only ESP and EBX remain live > > +1: movl $0x80000003, %eax // EFI_UNSUPPORTED > > + popl %ebx > > + RET > > +SYM_FUNC_END(efi32_pe_entry) > > + > > +#ifdef CONFIG_EFI_HANDOVER_PROTOCOL > > + .org efi32_stub_entry + 0x200 > > + .code64 > > +SYM_FUNC_START_NOALIGN(efi64_stub_entry) > > + jmp efi_handover_entry > > +SYM_FUNC_END(efi64_stub_entry) > > +#endif > > + > > + .data > > + .balign 8 > > +SYM_DATA_START_LOCAL(efi32_call) > > + .long efi_enter32 - . > > + .word 0x0 > > +SYM_DATA_END(efi32_call) > > +SYM_DATA(efi_is64, .byte 1) > > + > > + .bss > > + .balign PAGE_SIZE > > +SYM_DATA_LOCAL(pte, .fill 6 * PAGE_SIZE, 1, 0) > > diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile > > index d23a1b9..2f17339 100644 > > --- a/drivers/firmware/efi/libstub/Makefile > > +++ b/drivers/firmware/efi/libstub/Makefile > > @@ -85,7 +85,6 @@ lib-$(CONFIG_EFI_GENERIC_STUB) += efi-stub.o string.o intrinsics.o systable.o \ > > lib-$(CONFIG_ARM) += arm32-stub.o > > lib-$(CONFIG_ARM64) += kaslr.o arm64.o arm64-stub.o smbios.o > > lib-$(CONFIG_X86) += x86-stub.o smbios.o > > -lib-$(CONFIG_EFI_MIXED) += x86-mixed.o > > lib-$(CONFIG_X86_64) += x86-5lvl.o > > lib-$(CONFIG_RISCV) += kaslr.o riscv.o riscv-stub.o > > lib-$(CONFIG_LOONGARCH) += loongarch.o loongarch-stub.o > > diff --git a/drivers/firmware/efi/libstub/x86-mixed.S b/drivers/firmware/efi/libstub/x86-mixed.S > > deleted file mode 100644 > > index e04ed99..0000000 > > --- a/drivers/firmware/efi/libstub/x86-mixed.S > > +++ /dev/null > > @@ -1,253 +0,0 @@ > > -/* SPDX-License-Identifier: GPL-2.0 */ > > -/* > > - * Copyright (C) 2014, 2015 Intel Corporation; author Matt Fleming > > - * > > - * Early support for invoking 32-bit EFI services from a 64-bit kernel. > > - * > > - * Because this thunking occurs before ExitBootServices() we have to > > - * restore the firmware's 32-bit GDT and IDT before we make EFI service > > - * calls. > > - * > > - * On the plus side, we don't have to worry about mangling 64-bit > > - * addresses into 32-bits because we're executing with an identity > > - * mapped pagetable and haven't transitioned to 64-bit virtual addresses > > - * yet. > > - */ > > - > > -#include <linux/linkage.h> > > -#include <asm/desc_defs.h> > > -#include <asm/msr.h> > > -#include <asm/page_types.h> > > -#include <asm/pgtable_types.h> > > -#include <asm/processor-flags.h> > > -#include <asm/segment.h> > > - > > - .text > > - .code32 > > -#ifdef CONFIG_EFI_HANDOVER_PROTOCOL > > -SYM_FUNC_START(efi32_stub_entry) > > - call 1f > > -1: popl %ecx > > - > > - /* Clear BSS */ > > - xorl %eax, %eax > > - leal (_bss - 1b)(%ecx), %edi > > - leal (_ebss - 1b)(%ecx), %ecx > > - subl %edi, %ecx > > - shrl $2, %ecx > > - cld > > - rep stosl > > - > > - add $0x4, %esp /* Discard return address */ > > - movl 8(%esp), %ebx /* struct boot_params pointer */ > > - jmp efi32_startup > > -SYM_FUNC_END(efi32_stub_entry) > > -#endif > > - > > -/* > > - * Called using a far call from __efi64_thunk() below, using the x86_64 SysV > > - * ABI (except for R8/R9 which are inaccessible to 32-bit code - EAX/EBX are > > - * used instead). EBP+16 points to the arguments passed via the stack. > > - * > > - * The first argument (EDI) is a pointer to the boot service or protocol, to > > - * which the remaining arguments are passed, each truncated to 32 bits. > > - */ > > -SYM_FUNC_START_LOCAL(efi_enter32) > > - /* > > - * Convert x86-64 SysV ABI params to i386 ABI > > - */ > > - pushl 32(%ebp) /* Up to 3 args passed via the stack */ > > - pushl 24(%ebp) > > - pushl 16(%ebp) > > - pushl %ebx /* R9 */ > > - pushl %eax /* R8 */ > > - pushl %ecx > > - pushl %edx > > - pushl %esi > > - > > - /* Disable paging */ > > - movl %cr0, %eax > > - btrl $X86_CR0_PG_BIT, %eax > > - movl %eax, %cr0 > > - > > - /* Disable long mode via EFER */ > > - movl $MSR_EFER, %ecx > > - rdmsr > > - btrl $_EFER_LME, %eax > > - wrmsr > > - > > - call *%edi > > - > > - /* We must preserve return value */ > > - movl %eax, %edi > > - > > - call efi32_enable_long_mode > > - > > - addl $32, %esp > > - movl %edi, %eax > > - lret > > -SYM_FUNC_END(efi_enter32) > > - > > - .code64 > > -SYM_FUNC_START(__efi64_thunk) > > - push %rbp > > - movl %esp, %ebp > > - push %rbx > > - > > - /* Move args #5 and #6 into 32-bit accessible registers */ > > - movl %r8d, %eax > > - movl %r9d, %ebx > > - > > - lcalll *efi32_call(%rip) > > - > > - pop %rbx > > - pop %rbp > > - RET > > -SYM_FUNC_END(__efi64_thunk) > > - > > - .code32 > > -SYM_FUNC_START_LOCAL(efi32_enable_long_mode) > > - movl %cr4, %eax > > - btsl $(X86_CR4_PAE_BIT), %eax > > - movl %eax, %cr4 > > - > > - movl $MSR_EFER, %ecx > > - rdmsr > > - btsl $_EFER_LME, %eax > > - wrmsr > > - > > - /* Disable interrupts - the firmware's IDT does not work in long mode */ > > - cli > > - > > - /* Enable paging */ > > - movl %cr0, %eax > > - btsl $X86_CR0_PG_BIT, %eax > > - movl %eax, %cr0 > > - ret > > -SYM_FUNC_END(efi32_enable_long_mode) > > - > > -/* > > - * This is the common EFI stub entry point for mixed mode. It sets up the GDT > > - * and page tables needed for 64-bit execution, after which it calls the > > - * common 64-bit EFI entrypoint efi_stub_entry(). > > - * > > - * Arguments: 0(%esp) image handle > > - * 4(%esp) EFI system table pointer > > - * %ebx struct boot_params pointer (or NULL) > > - * > > - * Since this is the point of no return for ordinary execution, no registers > > - * are considered live except for the function parameters. [Note that the EFI > > - * stub may still exit and return to the firmware using the Exit() EFI boot > > - * service.] > > - */ > > -SYM_FUNC_START_LOCAL(efi32_startup) > > - movl %esp, %ebp > > - > > - subl $8, %esp > > - sgdtl (%esp) /* Save GDT descriptor to the stack */ > > - movl 2(%esp), %esi /* Existing GDT pointer */ > > - movzwl (%esp), %ecx /* Existing GDT limit */ > > - inc %ecx /* Existing GDT size */ > > - andl $~7, %ecx /* Ensure size is multiple of 8 */ > > - > > - subl %ecx, %esp /* Allocate new GDT */ > > - andl $~15, %esp /* Realign the stack */ > > - movl %esp, %edi /* New GDT address */ > > - leal 7(%ecx), %eax /* New GDT limit */ > > - pushw %cx /* Push 64-bit CS (for LJMP below) */ > > - pushl %edi /* Push new GDT address */ > > - pushw %ax /* Push new GDT limit */ > > - > > - /* Copy GDT to the stack and add a 64-bit code segment at the end */ > > - movl $GDT_ENTRY(DESC_CODE64, 0, 0xfffff) & 0xffffffff, (%edi,%ecx) > > - movl $GDT_ENTRY(DESC_CODE64, 0, 0xfffff) >> 32, 4(%edi,%ecx) > > - shrl $2, %ecx > > - cld > > - rep movsl /* Copy the firmware GDT */ > > - lgdtl (%esp) /* Switch to the new GDT */ > > - > > - call 1f > > -1: pop %edi > > - > > - /* Record mixed mode entry */ > > - movb $0x0, (efi_is64 - 1b)(%edi) > > - > > - /* Set up indirect far call to re-enter 32-bit mode */ > > - leal (efi32_call - 1b)(%edi), %eax > > - addl %eax, (%eax) > > - movw %cs, 4(%eax) > > - > > - /* Disable paging */ > > - movl %cr0, %eax > > - btrl $X86_CR0_PG_BIT, %eax > > - movl %eax, %cr0 > > - > > - /* Set up 1:1 mapping */ > > - leal (pte - 1b)(%edi), %eax > > - movl $_PAGE_PRESENT | _PAGE_RW | _PAGE_PSE, %ecx > > - leal (_PAGE_PRESENT | _PAGE_RW)(%eax), %edx > > -2: movl %ecx, (%eax) > > - addl $8, %eax > > - addl $PMD_SIZE, %ecx > > - jnc 2b > > - > > - movl $PAGE_SIZE, %ecx > > - .irpc l, 0123 > > - movl %edx, \l * 8(%eax) > > - addl %ecx, %edx > > - .endr > > - addl %ecx, %eax > > - movl %edx, (%eax) > > - movl %eax, %cr3 > > - > > - call efi32_enable_long_mode > > - > > - /* Set up far jump to 64-bit mode (CS is already on the stack) */ > > - leal (efi_stub_entry - 1b)(%edi), %eax > > - movl %eax, 2(%esp) > > - > > - movl 0(%ebp), %edi > > - movl 4(%ebp), %esi > > - movl %ebx, %edx > > - ljmpl *2(%esp) > > -SYM_FUNC_END(efi32_startup) > > - > > -/* > > - * efi_status_t efi32_pe_entry(efi_handle_t image_handle, > > - * efi_system_table_32_t *sys_table) > > - */ > > -SYM_FUNC_START(efi32_pe_entry) > > - pushl %ebx // save callee-save registers > > - > > - /* Check whether the CPU supports long mode */ > > - movl $0x80000001, %eax // assume extended info support > > - cpuid > > - btl $29, %edx // check long mode bit > > - jnc 1f > > - leal 8(%esp), %esp // preserve stack alignment > > - xor %ebx, %ebx // no struct boot_params pointer > > - jmp efi32_startup // only ESP and EBX remain live > > -1: movl $0x80000003, %eax // EFI_UNSUPPORTED > > - popl %ebx > > - RET > > -SYM_FUNC_END(efi32_pe_entry) > > - > > -#ifdef CONFIG_EFI_HANDOVER_PROTOCOL > > - .org efi32_stub_entry + 0x200 > > - .code64 > > -SYM_FUNC_START_NOALIGN(efi64_stub_entry) > > - jmp efi_handover_entry > > -SYM_FUNC_END(efi64_stub_entry) > > -#endif > > - > > - .data > > - .balign 8 > > -SYM_DATA_START_LOCAL(efi32_call) > > - .long efi_enter32 - . > > - .word 0x0 > > -SYM_DATA_END(efi32_call) > > -SYM_DATA(efi_is64, .byte 1) > > - > > - .bss > > - .balign PAGE_SIZE > > -SYM_DATA_LOCAL(pte, .fill 6 * PAGE_SIZE, 1, 0)
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