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c776fa113d
This patch contains code that needs to directly know about the RISC-V ABI, which is specified in a work-in-progress psABI document: https://github.com/riscv/riscv-elf-psabi-doc/blob/master/riscv-elf.md This is meant to contain all the RISC-V code that needs to explicitly name registers or manage in-memory structure layout. This does not contain any of the Linux-specific code. 2018-01-29 Palmer Dabbelt <palmer@sifive.com> * sysdeps/riscv/__longjmp.S: New file. * sysdeps/riscv/backtrace.c: Likewise. * sysdeps/riscv/bits/endian.h: Likewise. * sysdeps/riscv/bits/setjmp.h: Likewise. * sysdeps/riscv/bits/wordsize.h: Likewise. * sysdeps/riscv/bsd-_setjmp.c: Likewise. * sysdeps/riscv/bsd-setjmp.c: Likewise. * sysdeps/riscv/dl-trampoline.S: Likewise. * sysdeps/riscv/gccframe.h: Likewise. * sysdeps/riscv/jmpbuf-offsets.h: Likewise. * sysdeps/riscv/jmpbuf-unwind.h: Likewise. * sysdeps/riscv/machine-gmon.h: Likewise. * sysdeps/riscv/memusage.h: Likewise. * sysdeps/riscv/setjmp.S: Likewise. * sysdeps/riscv/sys/asm.h: Likewise. * sysdeps/riscv/tls-macros.h: Likewise.
82 lines
3.0 KiB
ArmAsm
82 lines
3.0 KiB
ArmAsm
/* Startup code compliant to the ELF RISC-V ABI.
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Copyright (C) 1995-2018 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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<http://www.gnu.org/licenses/>. */
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#define __ASSEMBLY__ 1
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#include <entry.h>
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#include <sysdep.h>
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#include <sys/asm.h>
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/* The entry point's job is to call __libc_start_main. Per the ABI,
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a0 contains the address of a function to be passed to atexit.
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__libc_start_main wants this in a5. */
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ENTRY (ENTRY_POINT)
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call .Lload_gp
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mv a5, a0 /* rtld_fini. */
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/* main may be in a shared library. */
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la a0, main
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REG_L a1, 0(sp) /* argc. */
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addi a2, sp, SZREG /* argv. */
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andi sp, sp, ALMASK /* Align stack. */
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lla a3, __libc_csu_init
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lla a4, __libc_csu_fini
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mv a6, sp /* stack_end. */
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tail __libc_start_main@plt
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END (ENTRY_POINT)
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/* Dynamic links need the global pointer to be initialized prior to calling
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any shared library's initializers, so we use preinit_array to load it.
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This doesn't cut it for static links, though, since the global pointer
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needs to be initialized before calling __libc_start_main in that case.
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So we redundantly initialize it at the beginning of _start. */
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.Lload_gp:
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.option push
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.option norelax
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lla gp, __global_pointer$
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.option pop
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ret
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.section .preinit_array,"aw"
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.dc.a .Lload_gp
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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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.weak data_start
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data_start = __data_start
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