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78da604641
Lua has a few places where it allocates a large buffer on the stack. This is normally fine, except there are a few places where there can be multiple frames with this buffer. This can cause a stack overflow on some arm64 SoCs. Fix this by allocating our own stack in loader.efi large enough for these objects. The required size has been found by tracing how the stack pointer changes in a virtual machine and found to be no larger than 50kB. A larger stack is allocated to reduce the likelihood of overflow from future changes. Reviewed by: kevans Approved by: re (kib) Differential Revision: https://reviews.freebsd.org/D16886
182 lines
5.1 KiB
ArmAsm
182 lines
5.1 KiB
ArmAsm
/*-
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* Copyright (c) 2014 Andrew Turner
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* We need to be a PE32+ file for EFI. On some architectures we can use
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* objcopy to create the correct file, however on arm64 we need to do
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* it ourselves.
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*/
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#define IMAGE_FILE_MACHINE_ARM64 0xaa64
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#define IMAGE_SCN_CNT_CODE 0x00000020
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#define IMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
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#define IMAGE_SCN_MEM_DISCARDABLE 0x02000000
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#define IMAGE_SCN_MEM_EXECUTE 0x20000000
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#define IMAGE_SCN_MEM_READ 0x40000000
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.section .peheader,"a"
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efi_start:
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/* The MS-DOS Stub, only used to get the offset of the COFF header */
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.ascii "MZ"
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.short 0
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.space 0x38
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.long pe_sig - efi_start
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/* The PE32 Signature. Needs to be 8-byte aligned */
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.align 3
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pe_sig:
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.ascii "PE"
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.short 0
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coff_head:
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.short IMAGE_FILE_MACHINE_ARM64 /* AArch64 file */
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.short 2 /* 2 Sections */
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.long 0 /* Timestamp */
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.long 0 /* No symbol table */
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.long 0 /* No symbols */
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.short section_table - optional_header /* Optional header size */
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.short 0 /* Characteristics TODO: Fill in */
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optional_header:
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.short 0x020b /* PE32+ (64-bit addressing) */
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.byte 0 /* Major linker version */
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.byte 0 /* Minor linker version */
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.long _edata - _end_header /* Code size */
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.long 0 /* No initialized data */
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.long 0 /* No uninitialized data */
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.long _start - efi_start /* Entry point */
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.long _end_header - efi_start /* Start of code */
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optional_windows_header:
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.quad 0 /* Image base */
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.long 32 /* Section Alignment */
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.long 8 /* File alignment */
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.short 0 /* Major OS version */
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.short 0 /* Minor OS version */
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.short 0 /* Major image version */
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.short 0 /* Minor image version */
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.short 0 /* Major subsystem version */
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.short 0 /* Minor subsystem version */
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.long 0 /* Win32 version */
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.long _edata - efi_start /* Image size */
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.long _end_header - efi_start /* Header size */
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.long 0 /* Checksum */
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.short 0xa /* Subsystem (EFI app) */
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.short 0 /* DLL Characteristics */
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.quad 0 /* Stack reserve */
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.quad 0 /* Stack commit */
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.quad 0 /* Heap reserve */
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.quad 0 /* Heap commit */
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.long 0 /* Loader flags */
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.long 6 /* Number of RVAs */
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/* RVAs: */
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.quad 0
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.quad 0
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.quad 0
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.quad 0
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.quad 0
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.quad 0
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section_table:
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/* We need a .reloc section for EFI */
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.ascii ".reloc"
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.byte 0
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.byte 0 /* Pad to 8 bytes */
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.long 0 /* Virtual size */
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.long 0 /* Virtual address */
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.long 0 /* Size of raw data */
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.long 0 /* Pointer to raw data */
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.long 0 /* Pointer to relocations */
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.long 0 /* Pointer to line numbers */
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.short 0 /* Number of relocations */
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.short 0 /* Number of line numbers */
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.long (IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ | \
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IMAGE_SCN_MEM_DISCARDABLE) /* Characteristics */
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/* The contents of the loader */
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.ascii ".text"
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.byte 0
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.byte 0
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.byte 0 /* Pad to 8 bytes */
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.long _edata - _end_header /* Virtual size */
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.long _end_header - efi_start /* Virtual address */
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.long _edata - _end_header /* Size of raw data */
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.long _end_header - efi_start /* Pointer to raw data */
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.long 0 /* Pointer to relocations */
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.long 0 /* Pointer to line numbers */
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.short 0 /* Number of relocations */
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.short 0 /* Number of line numbers */
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.long (IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | \
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IMAGE_SCN_MEM_READ) /* Characteristics */
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_end_header:
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.text
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.globl _start
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_start:
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/* Save the boot params to the stack */
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stp x0, x1, [sp, #-16]!
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adr x0, __bss_start
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adr x1, __bss_end
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b 2f
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1:
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stp xzr, xzr, [x0], #16
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2:
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cmp x0, x1
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b.lo 1b
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adr x0, ImageBase
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adr x1, _DYNAMIC
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bl self_reloc
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ldp x0, x1, [sp], #16
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#ifndef EFI_BOOT1
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/*
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* Load the stack to use. The default stack may be too small for
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* the lua loader.
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*/
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adr x2, initstack_end
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mov sp, x2
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#endif
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bl efi_main
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1: b 1b
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#ifndef EFI_BOOT1
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.bss
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.align 4
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initstack:
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.space (64 * 1024)
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initstack_end:
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#endif
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