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06d4381dd8
The start code can get linked into dynamic linked executables where LGPL would require shipping the source or linkable binaries when the executable is distributed. On some targets the license exception was missing in start.S (which is compiled into crt1.o and Scrt1.o which may end up linked into PDE and PIE binaries). I did not review what other code may end up in executables, just fixed the start.S license inconsistency across targets. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
116 lines
3.5 KiB
ArmAsm
116 lines
3.5 KiB
ArmAsm
/* start, OpenRISC version.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file with other
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programs, and to distribute those programs without any restriction
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coming from the use of this file. (The GNU Lesser General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into another program.)
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Note that people who make modified versions of this file are not
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obligated to grant this special exception for their modified
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versions; it is their choice whether to do so. The GNU Lesser
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General Public License gives permission to release a modified
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version without this exception; this exception also makes it
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possible to release a modified version which carries forward this
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exception.
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The GNU C Library is distributed in the hope that it will be useful,
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but 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* This is the canonical entry point, usually the first thing in the text
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segment.
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sp The stack contains the arguments and environment:
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0(sp) argc
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4(sp) argv[0]
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...
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(4*argc)(sp) NULL
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(4*(argc+1))(sp) envp[0]
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...
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NULL
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*/
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#define __ASSEMBLY__
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#include <sysdep.h>
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#include <entry.h>
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ENTRY (ENTRY_POINT)
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/* Setup Arguments to the __libc_start_main function. */
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/* Take values for argc and argv off the stack.
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These will be passed as arguments two and three to main
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and thus go in registers r4 and r5, respectively. */
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l.lwz r4, 0(r1)
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l.addi r5, r1, 4
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/* Pass in rtld_fini from dl-start.S. */
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l.or r8, r3, r3
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#ifdef PIC
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/* Obtain a pointer to .got in r16 */
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l.jal 0x8
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l.movhi r16, gotpchi(_GLOBAL_OFFSET_TABLE_-4)
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l.ori r16, r16, gotpclo(_GLOBAL_OFFSET_TABLE_+0)
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l.add r16, r16, r9
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/* Pass in the the main symbol. */
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l.lwz r3, got(main)(r16)
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#else
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/* Pass in the the main symbol. */
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l.movhi r3, hi(main)
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l.ori r3, r3, lo(main)
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#endif
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/* Used to be init and fini. */
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l.movhi r6, 0x0
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l.movhi r7, 0x0
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/* Push stack limit onto the stack.
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This provides the highest stack address to user code (as stack grows
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downwards.
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This is the seventh argument to __libc_start_main and thus needs to
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be passed on the stack. */
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l.sw -4(r1), r1
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/* Adjust stack to account for a total of 7 args (i.e. the last one is
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on the stack. */
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l.addi r1, r1, -4
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/* Clear the frame pointer and link register since this is the
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outermost frame. */
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l.movhi r2, 0x0
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l.movhi r9, 0x0
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/* Let the libc call main and exit with its return code. */
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#ifdef PIC
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l.j plt(__libc_start_main)
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#else
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l.j __libc_start_main
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#endif
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l.nop
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END (ENTRY_POINT)
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/* Define a symbol for the first piece of initialized data. */
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.data
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.globl __data_start
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__data_start:
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.long 0
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.weak data_start
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data_start = __data_start
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