mirror of
https://github.com/ipxe/ipxe
synced 2025-12-08 10:20:24 +03:00
4bef4c8069
Use compressed relocation records instead of raw Elf_Rela records. This saves around 15% of the total binary size for the all-drivers image bin-riscv64/ipxe.sbi. Signed-off-by: Michael Brown <mcb30@ipxe.org>
142 lines
3.2 KiB
ArmAsm
142 lines
3.2 KiB
ArmAsm
/*
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* Copyright (C) 2024 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
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/** @file
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*
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* SBI position-independent executable prefix
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*
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*/
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.section ".note.GNU-stack", "", @progbits
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.text
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/* SBI debug console extension */
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#define SBI_DBCN ( ( 'D' << 24 ) | ( 'B' << 16 ) | ( 'C' << 8 ) | 'N' )
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#define SBI_DBCN_WRITE 0x00
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/* SBI system reset extension */
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#define SBI_SRST ( ( 'S' << 24 ) | ( 'R' << 16 ) | ( 'S' << 8 ) | 'T' )
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#define SBI_SRST_SYSTEM_RESET 0x00
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#define SBI_RESET_COLD 0x00000001
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/* ELF machine type */
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#define EM_RISCV 243
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/*
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* Display progress message via debug console
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*/
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.macro progress message
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#ifndef NDEBUG
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.section ".prefix.data", "aw", @progbits
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progress_\@:
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.ascii "\message"
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.equ progress_\@_len, . - progress_\@
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.size progress_\@, . - progress_\@
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.previous
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li a7, SBI_DBCN
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li a6, SBI_DBCN_WRITE
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li a0, progress_\@_len
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la a1, progress_\@
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mv a2, zero
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ecall
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#endif
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.endm
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/*
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* SBI entry point
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*/
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.section ".prefix", "ax", @progbits
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.org 0
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.globl _sbi_start
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_sbi_start:
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/* Preserve arguments */
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mv s0, a0
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mv s1, a1
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progress "\nSBI->iPXE"
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/* Apply dynamic relocations */
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call apply_relocs
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progress " .reloc"
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/* Zero the bss */
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la t0, _bss
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la t1, _ebss
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1: STOREN zero, (t0)
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addi t0, t0, ( __riscv_xlen / 8 )
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blt t0, t1, 1b
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progress " .bss"
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/* Set up stack */
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la sp, _estack
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progress " .stack"
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/* Store boot hart */
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la t0, boot_hart
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STOREN s0, (t0)
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/* Register device tree */
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la a0, sysfdt
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mv a1, s1
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li a2, -1
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call fdt_parse
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/* Call main program */
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progress "\n\n"
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call main
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/* We have no return path, since the M-mode SBI implementation
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* will have jumped to us by setting our start address in MEPC
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* and issuing an MRET instruction.
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*
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* Attempt a system reset, since there is nothing else we can
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* viably do at this point.
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*/
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progress "\niPXE->SBI reset\n"
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li a7, SBI_SRST
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li a6, SBI_SRST_SYSTEM_RESET
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li a0, SBI_RESET_COLD
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mv a1, zero
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ecall
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/* If reset failed, lock the system */
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progress "(reset failed)\n"
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1: wfi
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j 1b
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.size _sbi_start, . - _sbi_start
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/* File split information for the compressor */
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.section ".zinfo", "a", @progbits
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.ascii "COPY"
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.word 0
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.word _filesz
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.word 1
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.ascii "BASE"
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.word 0
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.dword _base
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.ascii "ZREL"
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.word _reloc_offset
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.word _reloc_filesz
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.word EM_RISCV
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