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RISC-V: Linux ABI

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Linux-specific code that is required for maintaining ABI compatibility.
This doesn't contain the actual system call interface, that is split out
in order to avoid having a patch that's too big.

2018-01-29  Palmer Dabbelt  <palmer@sifive.com>

        * sysdeps/riscv/nptl/pthread-offsets.h: New file.
        * sysdeps/riscv/nptl/pthreaddef.h: Likewise.
        * sysdeps/unix/sysv/linux/riscv/bits/fcntl.h: Likewise.
        * sysdeps/unix/sysv/linux/riscv/bits/mman.h: Likewise.
        * sysdeps/unix/sysv/linux/riscv/bits/sigcontext.h: Likewise.
        * sysdeps/unix/sysv/linux/riscv/dl-cache.h: Likewise.
        * sysdeps/unix/sysv/linux/riscv/flush-icache.c: Likewise.
        * sysdeps/unix/sysv/linux/riscv/getcontext.S: Likewise.
        * sysdeps/unix/sysv/linux/riscv/init-first.c: Likewise.
        * sysdeps/unix/sysv/linux/riscv/libc-vdso.h: Likewise.
        * sysdeps/unix/sysv/linux/riscv/makecontext.c: Likewise.
        * sysdeps/unix/sysv/linux/riscv/readelflib.c: Likewise.
        * sysdeps/unix/sysv/linux/riscv/register-dump.h: Likewise.
        * sysdeps/unix/sysv/linux/riscv/setcontext.S: Likewise.
        * sysdeps/unix/sysv/linux/riscv/sigcontextinfo.h: Likewise.
        * sysdeps/unix/sysv/linux/riscv/swapcontext.S: Likewise.
        * sysdeps/unix/sysv/linux/riscv/sys/cachectl.h: Likewise.
        * sysdeps/unix/sysv/linux/riscv/sys/procfs.h: Likewise.
        * sysdeps/unix/sysv/linux/riscv/sys/ucontext.h: Likewise.
        * sysdeps/unix/sysv/linux/riscv/sys/user.h: Likewise.
        * sysdeps/unix/sysv/linux/riscv/ucontext-macros.h: Likewise.
        * sysdeps/unix/sysv/linux/riscv/ucontext_i.sym: Likewise.
This commit is contained in:
Palmer Dabbelt
2018-01-29 10:28:32 -08:00
parent 36960f0c76
commit 7f33b09c65
24 changed files with 1445 additions and 0 deletions
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78
sysdeps/unix/sysv/linux/riscv/makecontext.c Normal file
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/* Create new context. RISC-V version.
Copyright (C) 2001-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <sys/asm.h>
#include <sys/ucontext.h>
#include <stdarg.h>
#include <assert.h>
void
__makecontext (ucontext_t *ucp, void (*func) (void), int argc,
long int a0, long int a1, long int a2, long int a3, long int a4,
...)
{
extern void __start_context (void) attribute_hidden;
long int i, sp;
_Static_assert (REG_NARGS == 8, "__makecontext assumes 8 argument registers");
/* Set up the stack. */
sp = ((long int) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size) & ALMASK;
/* Set up the register context.
ra = s0 = 0, terminating the stack for backtracing purposes.
s1 = the function we must call.
s2 = the subsequent context to run. */
ucp->uc_mcontext.__gregs[REG_RA] = 0;
ucp->uc_mcontext.__gregs[REG_S0] = 0;
ucp->uc_mcontext.__gregs[REG_S1] = (long int) func;
ucp->uc_mcontext.__gregs[REG_S2] = (long int) ucp->uc_link;
ucp->uc_mcontext.__gregs[REG_SP] = sp;
ucp->uc_mcontext.__gregs[REG_PC] = (long int) &__start_context;
/* Put args in a0-a7, then put any remaining args on the stack. */
ucp->uc_mcontext.__gregs[REG_A0 + 0] = a0;
ucp->uc_mcontext.__gregs[REG_A0 + 1] = a1;
ucp->uc_mcontext.__gregs[REG_A0 + 2] = a2;
ucp->uc_mcontext.__gregs[REG_A0 + 3] = a3;
ucp->uc_mcontext.__gregs[REG_A0 + 4] = a4;
if (__glibc_unlikely (argc > 5))
{
va_list vl;
va_start (vl, a4);
long reg_args = argc < REG_NARGS ? argc : REG_NARGS;
for (i = 5; i < reg_args; i++)
ucp->uc_mcontext.__gregs[REG_A0 + i] = va_arg (vl, long);
long int stack_args = argc - reg_args;
if (stack_args > 0)
{
sp = (sp - stack_args * sizeof (long int)) & ALMASK;
ucp->uc_mcontext.__gregs[REG_SP] = sp;
for (i = 0; i < stack_args; i++)
((long int *) sp)[i] = va_arg (vl, long int);
}
va_end (vl);
}
}
weak_alias (__makecontext, makecontext)