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RISC-V: ABI Implementation 

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.
This commit is contained in:
Palmer Dabbelt 2017-12-26 20:51:24 -08:00
parent ba9e25a62b
commit c776fa113d
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24 changed files with 1170 additions and 0 deletions
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16
ChangeLog
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@ -6,6 +6,22 @@
* config.h.in: Regenerate.
* manual/platform.texi: Add RISC-V documenation for
__riscv_flush_icache.
* 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.
2018-01-29 Florian Weimer <fweimer@redhat.com>

57
sysdeps/riscv/__longjmp.S Normal file
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@ -0,0 +1,57 @@
/* longjmp, RISC-V version.
Copyright (C) 1996-2018 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>
ENTRY (__longjmp)
REG_L ra, 0*SZREG(a0)
REG_L s0, 1*SZREG(a0)
REG_L s1, 2*SZREG(a0)
REG_L s2, 3*SZREG(a0)
REG_L s3, 4*SZREG(a0)
REG_L s4, 5*SZREG(a0)
REG_L s5, 6*SZREG(a0)
REG_L s6, 7*SZREG(a0)
REG_L s7, 8*SZREG(a0)
REG_L s8, 9*SZREG(a0)
REG_L s9, 10*SZREG(a0)
REG_L s10,11*SZREG(a0)
REG_L s11,12*SZREG(a0)
REG_L sp, 13*SZREG(a0)
#ifndef __riscv_float_abi_soft
FREG_L fs0, 14*SZREG+ 0*SZFREG(a0)
FREG_L fs1, 14*SZREG+ 1*SZFREG(a0)
FREG_L fs2, 14*SZREG+ 2*SZFREG(a0)
FREG_L fs3, 14*SZREG+ 3*SZFREG(a0)
FREG_L fs4, 14*SZREG+ 4*SZFREG(a0)
FREG_L fs5, 14*SZREG+ 5*SZFREG(a0)
FREG_L fs6, 14*SZREG+ 6*SZFREG(a0)
FREG_L fs7, 14*SZREG+ 7*SZFREG(a0)
FREG_L fs8, 14*SZREG+ 8*SZFREG(a0)
FREG_L fs9, 14*SZREG+ 9*SZFREG(a0)
FREG_L fs10,14*SZREG+10*SZFREG(a0)
FREG_L fs11,14*SZREG+11*SZFREG(a0)
#endif
seqz a0, a1
add a0, a0, a1 # a0 = (a1 == 0) ? 1 : a1
ret
END (__longjmp)

1
sysdeps/riscv/backtrace.c Normal file
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#include <sysdeps/x86_64/backtrace.c>

5
sysdeps/riscv/bits/endian.h Normal file
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#ifndef _ENDIAN_H
# error "Never use <bits/endian.h> directly; include <endian.h> instead."
#endif
#define __BYTE_ORDER __LITTLE_ENDIAN

56
sysdeps/riscv/bits/link.h Normal file
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/* Machine-specific declarations for dynamic linker interface. RISC-V version.
Copyright (C) 2005-2018 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/>. */
#ifndef _LINK_H
# error "Never include <bits/link.h> directly; use <link.h> instead."
#endif
typedef struct La_riscv_regs
{
unsigned long int lr_reg[8]; /* a0 - a7 */
double lr_fpreg[8]; /* fa0 - fa7 */
unsigned long int lr_ra;
unsigned long int lr_sp;
} La_riscv_regs;
/* Return values for calls from PLT on RISC-V. */
typedef struct La_riscv_retval
{
unsigned long int lrv_a0;
unsigned long int lrv_a1;
double lrv_fa0;
double lrv_fa1;
} La_riscv_retval;
__BEGIN_DECLS
extern ElfW(Addr) la_riscv_gnu_pltenter (ElfW(Sym) *__sym, unsigned int __ndx,
uintptr_t *__refcook,
uintptr_t *__defcook,
La_riscv_regs *__regs,
unsigned int *__flags,
const char *__symname,
long int *__framesizep);
extern unsigned int la_riscv_gnu_pltexit (ElfW(Sym) *__sym, unsigned int __ndx,
uintptr_t *__refcook,
uintptr_t *__defcook,
const La_riscv_regs *__inregs,
La_riscv_retval *__outregs,
const char *__symname);
__END_DECLS

39
sysdeps/riscv/bits/setjmp.h Normal file
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@ -0,0 +1,39 @@
/* Define the machine-dependent type `jmp_buf'. RISC-V version.
Copyright (C) 2011-2018 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/>. */
#ifndef _RISCV_BITS_SETJMP_H
#define _RISCV_BITS_SETJMP_H
typedef struct __jmp_buf_internal_tag
{
/* Program counter. */
long int __pc;
/* Callee-saved registers. */
long int __regs[12];
/* Stack pointer. */
long int __sp;
/* Callee-saved floating point registers. */
#if defined __riscv_float_abi_double
double __fpregs[12];
#elif !defined __riscv_float_abi_soft
# error unsupported FLEN
#endif
} __jmp_buf[1];
#endif /* _RISCV_BITS_SETJMP_H */

29
sysdeps/riscv/bits/wordsize.h Normal file
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/* Determine the wordsize from the preprocessor defines. RISC-V version.
Copyright (C) 2002-2018 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/>. */
#if __riscv_xlen == (__SIZEOF_POINTER__ * 8)
# define __WORDSIZE __riscv_xlen
#else
# error unsupported ABI
#endif
#if __riscv_xlen == 64
# define __WORDSIZE_TIME64_COMPAT32 1
#else
# error "rv32i-based targets are not supported"
#endif

1
sysdeps/riscv/bsd-_setjmp.c Normal file
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/* _setjmp is implemented in setjmp.S */

1
sysdeps/riscv/bsd-setjmp.c Normal file
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/* setjmp is implemented in setjmp.S */

323
sysdeps/riscv/dl-machine.h Normal file
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/* Machine-dependent ELF dynamic relocation inline functions. RISC-V version.
Copyright (C) 2011-2018 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/>. */
#ifndef dl_machine_h
#define dl_machine_h
#define ELF_MACHINE_NAME "RISC-V"
#include <entry.h>
#include <elf/elf.h>
#include <sys/asm.h>
#include <dl-tls.h>
#ifndef _RTLD_PROLOGUE
# define _RTLD_PROLOGUE(entry) \
".globl\t" __STRING (entry) "\n\t" \
".type\t" __STRING (entry) ", @function\n" \
__STRING (entry) ":\n\t"
#endif
#ifndef _RTLD_EPILOGUE
# define _RTLD_EPILOGUE(entry) \
".size\t" __STRING (entry) ", . - " __STRING (entry) "\n\t"
#endif
#define ELF_MACHINE_JMP_SLOT R_RISCV_JUMP_SLOT
#define elf_machine_type_class(type) \
((ELF_RTYPE_CLASS_PLT * ((type) == ELF_MACHINE_JMP_SLOT \
|| (__WORDSIZE == 32 && (type) == R_RISCV_TLS_DTPREL32) \
|| (__WORDSIZE == 32 && (type) == R_RISCV_TLS_DTPMOD32) \
|| (__WORDSIZE == 32 && (type) == R_RISCV_TLS_TPREL32) \
|| (__WORDSIZE == 64 && (type) == R_RISCV_TLS_DTPREL64) \
|| (__WORDSIZE == 64 && (type) == R_RISCV_TLS_DTPMOD64) \
|| (__WORDSIZE == 64 && (type) == R_RISCV_TLS_TPREL64))) \
| (ELF_RTYPE_CLASS_COPY * ((type) == R_RISCV_COPY)))
#define ELF_MACHINE_NO_REL 1
#define ELF_MACHINE_NO_RELA 0
/* Return nonzero iff ELF header is compatible with the running host. */
static inline int __attribute_used__
elf_machine_matches_host (const ElfW(Ehdr) *ehdr)
{
/* We can only run RISC-V binaries. */
if (ehdr->e_machine != EM_RISCV)
return 0;
/* Ensure the library's floating-point ABI matches that of the running
system. For now we don't support mixing XLEN, so there's no need (or way)
to check it matches. */
#ifdef __riscv_float_abi_double
if ((ehdr->e_flags & EF_RISCV_FLOAT_ABI) != EF_RISCV_FLOAT_ABI_DOUBLE)
return 0;
#else
if ((ehdr->e_flags & EF_RISCV_FLOAT_ABI) != EF_RISCV_FLOAT_ABI_SOFT)
return 0;
#endif
return 1;
}
/* Return the link-time address of _DYNAMIC. */
static inline ElfW(Addr)
elf_machine_dynamic (void)
{
extern ElfW(Addr) _GLOBAL_OFFSET_TABLE_ __attribute__ ((visibility ("hidden")));
return _GLOBAL_OFFSET_TABLE_;
}
#define STRINGXP(X) __STRING (X)
#define STRINGXV(X) STRINGV_ (X)
#define STRINGV_(...) # __VA_ARGS__
/* Return the run-time load address of the shared object. */
static inline ElfW(Addr)
elf_machine_load_address (void)
{
ElfW(Addr) load_addr;
asm ("lla %0, _DYNAMIC" : "=r" (load_addr));
return load_addr - elf_machine_dynamic ();
}
/* Initial entry point code for the dynamic linker.
The C function `_dl_start' is the real entry point;
its return value is the user program's entry point. */
#define RTLD_START asm (\
".text\n\
" _RTLD_PROLOGUE (ENTRY_POINT) "\
mv a0, sp\n\
jal _dl_start\n\
# Stash user entry point in s0.\n\
mv s0, a0\n\
# See if we were run as a command with the executable file\n\
# name as an extra leading argument.\n\
lw a0, _dl_skip_args\n\
# Load the original argument count.\n\
" STRINGXP (REG_L) " a1, 0(sp)\n\
# Subtract _dl_skip_args from it.\n\
sub a1, a1, a0\n\
# Adjust the stack pointer to skip _dl_skip_args words.\n\
sll a0, a0, " STRINGXP (PTRLOG) "\n\
add sp, sp, a0\n\
# Save back the modified argument count.\n\
" STRINGXP (REG_S) " a1, 0(sp)\n\
# Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env) \n\
" STRINGXP (REG_L) " a0, _rtld_local\n\
add a2, sp, " STRINGXP (SZREG) "\n\
sll a3, a1, " STRINGXP (PTRLOG) "\n\
add a3, a3, a2\n\
add a3, a3, " STRINGXP (SZREG) "\n\
# Call the function to run the initializers.\n\
jal _dl_init\n\
# Pass our finalizer function to _start.\n\
lla a0, _dl_fini\n\
# Jump to the user entry point.\n\
jr s0\n\
" _RTLD_EPILOGUE (ENTRY_POINT) "\
.previous" \
);
/* Names of the architecture-specific auditing callback functions. */
#define ARCH_LA_PLTENTER riscv_gnu_pltenter
#define ARCH_LA_PLTEXIT riscv_gnu_pltexit
/* Bias .got.plt entry by the offset requested by the PLT header. */
#define elf_machine_plt_value(map, reloc, value) (value)
static inline ElfW(Addr)
elf_machine_fixup_plt (struct link_map *map, lookup_t t,
const ElfW(Sym) *refsym, const ElfW(Sym) *sym,
const ElfW(Rela) *reloc,
ElfW(Addr) *reloc_addr, ElfW(Addr) value)
{
return *reloc_addr = value;
}
#endif /* !dl_machine_h */
#ifdef RESOLVE_MAP
/* Perform a relocation described by R_INFO at the location pointed to
by RELOC_ADDR. SYM is the relocation symbol specified by R_INFO and
MAP is the object containing the reloc. */
auto inline void
__attribute__ ((always_inline))
elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc,
const ElfW(Sym) *sym, const struct r_found_version *version,
void *const reloc_addr, int skip_ifunc)
{
ElfW(Addr) r_info = reloc->r_info;
const unsigned long int r_type = ELFW (R_TYPE) (r_info);
ElfW(Addr) *addr_field = (ElfW(Addr) *) reloc_addr;
const ElfW(Sym) *const __attribute__ ((unused)) refsym = sym;
struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
ElfW(Addr) value = 0;
if (sym_map != NULL)
value = sym_map->l_addr + sym->st_value + reloc->r_addend;
switch (r_type)
{
#ifndef RTLD_BOOTSTRAP
case __WORDSIZE == 64 ? R_RISCV_TLS_DTPMOD64 : R_RISCV_TLS_DTPMOD32:
if (sym_map)
*addr_field = sym_map->l_tls_modid;
break;
case __WORDSIZE == 64 ? R_RISCV_TLS_DTPREL64 : R_RISCV_TLS_DTPREL32:
if (sym != NULL)
*addr_field = TLS_DTPREL_VALUE (sym) + reloc->r_addend;
break;
case __WORDSIZE == 64 ? R_RISCV_TLS_TPREL64 : R_RISCV_TLS_TPREL32:
if (sym != NULL)
{
CHECK_STATIC_TLS (map, sym_map);
*addr_field = TLS_TPREL_VALUE (sym_map, sym) + reloc->r_addend;
}
break;
case R_RISCV_COPY:
{
if (__glibc_unlikely (sym == NULL))
/* This can happen in trace mode if an object could not be
found. */
break;
/* Handle TLS copy relocations. */
if (__glibc_unlikely (ELFW (ST_TYPE) (sym->st_info) == STT_TLS))
{
/* There's nothing to do if the symbol is in .tbss. */
if (__glibc_likely (sym->st_value >= sym_map->l_tls_initimage_size))
break;
value += (ElfW(Addr)) sym_map->l_tls_initimage - sym_map->l_addr;
}
size_t size = sym->st_size;
if (__glibc_unlikely (sym->st_size != refsym->st_size))
{
const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
if (sym->st_size > refsym->st_size)
size = refsym->st_size;
if (sym->st_size > refsym->st_size || GLRO(dl_verbose))
_dl_error_printf ("\
%s: Symbol `%s' has different size in shared object, consider re-linking\n",
rtld_progname ?: "<program name unknown>",
strtab + refsym->st_name);
}
memcpy (reloc_addr, (void *)value, size);
break;
}
#endif
#if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
case R_RISCV_RELATIVE:
{
# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
/* This is defined in rtld.c, but nowhere in the static libc.a;
make the reference weak so static programs can still link.
This declaration cannot be done when compiling rtld.c
(i.e. #ifdef RTLD_BOOTSTRAP) because rtld.c contains the
common defn for _dl_rtld_map, which is incompatible with a
weak decl in the same file. */
# ifndef SHARED
weak_extern (GL(dl_rtld_map));
# endif
if (map != &GL(dl_rtld_map)) /* Already done in rtld itself. */
# endif
*addr_field = map->l_addr + reloc->r_addend;
break;
}
#endif
case R_RISCV_JUMP_SLOT:
case __WORDSIZE == 64 ? R_RISCV_64 : R_RISCV_32:
*addr_field = value;
break;
case R_RISCV_NONE:
break;
default:
_dl_reloc_bad_type (map, r_type, 0);
break;
}
}
auto inline void
__attribute__ ((always_inline))
elf_machine_rela_relative (ElfW(Addr) l_addr, const ElfW(Rela) *reloc,
void *const reloc_addr)
{
*(ElfW(Addr) *) reloc_addr = l_addr + reloc->r_addend;
}
auto inline void
__attribute__ ((always_inline))
elf_machine_lazy_rel (struct link_map *map, ElfW(Addr) l_addr,
const ElfW(Rela) *reloc, int skip_ifunc)
{
ElfW(Addr) *const reloc_addr = (void *) (l_addr + reloc->r_offset);
const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info);
/* Check for unexpected PLT reloc type. */
if (__glibc_likely (r_type == R_RISCV_JUMP_SLOT))
{
if (__glibc_unlikely (map->l_mach.plt == 0))
{
if (l_addr)
*reloc_addr += l_addr;
}
else
*reloc_addr = map->l_mach.plt;
}
else
_dl_reloc_bad_type (map, r_type, 1);
}
/* Set up the loaded object described by L so its stub function
will jump to the on-demand fixup code __dl_runtime_resolve. */
auto inline int
__attribute__ ((always_inline))
elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
{
#ifndef RTLD_BOOTSTRAP
/* If using PLTs, fill in the first two entries of .got.plt. */
if (l->l_info[DT_JMPREL])
{
extern void _dl_runtime_resolve (void) __attribute__ ((visibility ("hidden")));
ElfW(Addr) *gotplt = (ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]);
/* If a library is prelinked but we have to relocate anyway,
we have to be able to undo the prelinking of .got.plt.
The prelinker saved the address of .plt for us here. */
if (gotplt[1])
l->l_mach.plt = gotplt[1] + l->l_addr;
gotplt[0] = (ElfW(Addr)) &_dl_runtime_resolve;
gotplt[1] = (ElfW(Addr)) l;
}
#endif
return lazy;
}
#endif /* RESOLVE_MAP */

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/* RISC-V PLT trampoline
Copyright (C) 2017-2018 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>
/* Assembler veneer called from the PLT header code for lazy loading.
The PLT header passes its own args in t0-t2. */
#ifdef __riscv_float_abi_soft
# define FRAME_SIZE (-((-10 * SZREG) & ALMASK))
#else
# define FRAME_SIZE (-((-10 * SZREG - 8 * SZFREG) & ALMASK))
#endif
ENTRY (_dl_runtime_resolve)
# Save arguments to stack.
addi sp, sp, -FRAME_SIZE
REG_S ra, 9*SZREG(sp)
REG_S a0, 1*SZREG(sp)
REG_S a1, 2*SZREG(sp)
REG_S a2, 3*SZREG(sp)
REG_S a3, 4*SZREG(sp)
REG_S a4, 5*SZREG(sp)
REG_S a5, 6*SZREG(sp)
REG_S a6, 7*SZREG(sp)
REG_S a7, 8*SZREG(sp)
#ifndef __riscv_float_abi_soft
FREG_S fa0, (10*SZREG + 0*SZFREG)(sp)
FREG_S fa1, (10*SZREG + 1*SZFREG)(sp)
FREG_S fa2, (10*SZREG + 2*SZFREG)(sp)
FREG_S fa3, (10*SZREG + 3*SZFREG)(sp)
FREG_S fa4, (10*SZREG + 4*SZFREG)(sp)
FREG_S fa5, (10*SZREG + 5*SZFREG)(sp)
FREG_S fa6, (10*SZREG + 6*SZFREG)(sp)
FREG_S fa7, (10*SZREG + 7*SZFREG)(sp)
#endif
# Update .got.plt and obtain runtime address of callee.
slli a1, t1, 1
mv a0, t0 # link map
add a1, a1, t1 # reloc offset (== thrice the .got.plt offset)
la a2, _dl_fixup
jalr a2
mv t1, a0
# Restore arguments from stack.
REG_L ra, 9*SZREG(sp)
REG_L a0, 1*SZREG(sp)
REG_L a1, 2*SZREG(sp)
REG_L a2, 3*SZREG(sp)
REG_L a3, 4*SZREG(sp)
REG_L a4, 5*SZREG(sp)
REG_L a5, 6*SZREG(sp)
REG_L a6, 7*SZREG(sp)
REG_L a7, 8*SZREG(sp)
#ifndef __riscv_float_abi_soft
FREG_L fa0, (10*SZREG + 0*SZFREG)(sp)
FREG_L fa1, (10*SZREG + 1*SZFREG)(sp)
FREG_L fa2, (10*SZREG + 2*SZFREG)(sp)
FREG_L fa3, (10*SZREG + 3*SZFREG)(sp)
FREG_L fa4, (10*SZREG + 4*SZFREG)(sp)
FREG_L fa5, (10*SZREG + 5*SZFREG)(sp)
FREG_L fa6, (10*SZREG + 6*SZFREG)(sp)
FREG_L fa7, (10*SZREG + 7*SZFREG)(sp)
#endif
addi sp, sp, FRAME_SIZE
# Invoke the callee.
jr t1
END (_dl_runtime_resolve)

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/* Definition of object in frame unwind info. 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/>. */
#define FIRST_PSEUDO_REGISTER 66
#include <sysdeps/generic/gccframe.h>

23
sysdeps/riscv/jmpbuf-offsets.h Normal file
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/* Private macros for accessing __jmp_buf contents. RISC-V version.
Copyright (C) 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 <jmpbuf-unwind.h>
/* Helper for generic ____longjmp_chk(). */
#define JB_FRAME_ADDRESS(buf) \
((void *) _jmpbuf_sp (buf))

46
sysdeps/riscv/jmpbuf-unwind.h Normal file
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/* Examine __jmp_buf for unwinding frames. RISC-V version.
Copyright (C) 2003-2018 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 <setjmp.h>
#include <stdint.h>
#include <unwind.h>
#include <sysdep.h>
/* Test if longjmp to JMPBUF would unwind the frame
containing a local variable at ADDRESS. */
#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
((void *) (address) < (void *) demangle ((jmpbuf)[0].__sp))
#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
_JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context), _adj)
static inline uintptr_t __attribute__ ((unused))
_jmpbuf_sp (__jmp_buf regs)
{
uintptr_t sp = regs[0].__sp;
#ifdef PTR_DEMANGLE
PTR_DEMANGLE (sp);
#endif
return sp;
}
#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
/* We use the normal longjmp for unwinding. */
#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)

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/* Run-time dynamic linker data structures for loaded ELF shared objects.
Copyright (C) 2011-2018 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/>. */
#ifndef _RISCV_LDSODEFS_H
#define _RISCV_LDSODEFS_H 1
#include <elf.h>
struct La_riscv_regs;
struct La_riscv_retval;
#define ARCH_PLTENTER_MEMBERS \
ElfW(Addr) (*riscv_gnu_pltenter) (ElfW(Sym) *, unsigned int, \
uintptr_t *, uintptr_t *, \
const struct La_riscv_regs *, \
unsigned int *, const char *name, \
long int *framesizep);
#define ARCH_PLTEXIT_MEMBERS \
unsigned int (*riscv_gnu_pltexit) (ElfW(Sym) *, unsigned int, \
uintptr_t *, uintptr_t *, \
const struct La_riscv_regs *, \
struct La_riscv_retval *, \
const char *);
/* The RISC-V ABI specifies that the dynamic section has to be read-only. */
#define DL_RO_DYN_SECTION 1
#include_next <ldsodefs.h>
#endif

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struct link_map_machine
{
ElfW(Addr) plt; /* Address of .plt. */
};

37
sysdeps/riscv/machine-gmon.h Normal file
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/* RISC-V definitions for profiling support.
Copyright (C) 1996-2018 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/>. */
/* Accept 'frompc' address as argument from the function that calls
_mcount for profiling. Use __builtin_return_address (0)
for the 'selfpc' address. */
#include <sysdep.h>
static void mcount_internal (unsigned long int frompc,
unsigned long int selfpc);
#define _MCOUNT_DECL(frompc, selfpc) \
static inline void mcount_internal (unsigned long int frompc, \
unsigned long int selfpc)
#define MCOUNT \
void _mcount (void *frompc) \
{ \
mcount_internal ((unsigned long int) frompc, \
(unsigned long int) RETURN_ADDRESS (0)); \
}

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/* Machine-specific definitions for memory usage profiling, RISC-V version.
Copyright (C) 2000-2018 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/>. */
#define GETSP() ({ register uintptr_t stack_ptr asm ("sp"); stack_ptr; })
#include <sysdeps/generic/memusage.h>

74
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/* setjmp for RISC-V.
Copyright (C) 1996-2018 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>
ENTRY (_setjmp)
li a1, 0
j __sigsetjmp
END (_setjmp)
ENTRY (setjmp)
li a1, 1
/* Fallthrough */
END (setjmp)
ENTRY (__sigsetjmp)
REG_S ra, 0*SZREG(a0)
REG_S s0, 1*SZREG(a0)
REG_S s1, 2*SZREG(a0)
REG_S s2, 3*SZREG(a0)
REG_S s3, 4*SZREG(a0)
REG_S s4, 5*SZREG(a0)
REG_S s5, 6*SZREG(a0)
REG_S s6, 7*SZREG(a0)
REG_S s7, 8*SZREG(a0)
REG_S s8, 9*SZREG(a0)
REG_S s9, 10*SZREG(a0)
REG_S s10,11*SZREG(a0)
REG_S s11,12*SZREG(a0)
REG_S sp, 13*SZREG(a0)
#ifndef __riscv_float_abi_soft
FREG_S fs0, 14*SZREG+ 0*SZFREG(a0)
FREG_S fs1, 14*SZREG+ 1*SZFREG(a0)
FREG_S fs2, 14*SZREG+ 2*SZFREG(a0)
FREG_S fs3, 14*SZREG+ 3*SZFREG(a0)
FREG_S fs4, 14*SZREG+ 4*SZFREG(a0)
FREG_S fs5, 14*SZREG+ 5*SZFREG(a0)
FREG_S fs6, 14*SZREG+ 6*SZFREG(a0)
FREG_S fs7, 14*SZREG+ 7*SZFREG(a0)
FREG_S fs8, 14*SZREG+ 8*SZFREG(a0)
FREG_S fs9, 14*SZREG+ 9*SZFREG(a0)
FREG_S fs10,14*SZREG+10*SZFREG(a0)
FREG_S fs11,14*SZREG+11*SZFREG(a0)
#endif
#if !IS_IN (libc) && IS_IN (rtld)
/* In ld.so we never save the signal mask. */
li a0, 0
ret
#else
/* Make a tail call to __sigjmp_save; it takes the same args. */
j __sigjmp_save
#endif
END (__sigsetjmp)
hidden_def (__sigsetjmp)
weak_alias (_setjmp, __GI__setjmp)

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sysdeps/riscv/sotruss-lib.c Normal file
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/* Override generic sotruss-lib.c to define actual functions for RISC-V.
Copyright (C) 2012-2018 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/>. */
#define HAVE_ARCH_PLTENTER
#define HAVE_ARCH_PLTEXIT
#include <elf/sotruss-lib.c>
ElfW(Addr)
la_riscv_gnu_pltenter (ElfW(Sym) *sym __attribute__ ((unused)),
unsigned int ndx __attribute__ ((unused)),
uintptr_t *refcook, uintptr_t *defcook,
La_riscv_regs *regs, unsigned int *flags,
const char *symname, long int *framesizep)
{
print_enter (refcook, defcook, symname,
regs->lr_reg[0], regs->lr_reg[1], regs->lr_reg[2],
*flags);
/* No need to copy anything, we will not need the parameters in any case. */
*framesizep = 0;
return sym->st_value;
}
unsigned int
la_riscv_gnu_pltexit (ElfW(Sym) *sym, unsigned int ndx, uintptr_t *refcook,
uintptr_t *defcook,
const struct La_riscv_regs *inregs,
struct La_riscv_retval *outregs,
const char *symname)
{
print_exit (refcook, defcook, symname, outregs->lrv_a0);
return 0;
}

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sysdeps/riscv/start.S Normal file
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/* Startup code compliant to the ELF RISC-V ABI.
Copyright (C) 1995-2018 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.
In addition to the permissions in the GNU Lesser General Public
License, the Free Software Foundation gives you unlimited
permission to link the compiled version of this file with other
programs, and to distribute those programs without any restriction
coming from the use of this file. (The GNU Lesser General Public
License restrictions do apply in other respects; for example, they
cover modification of the file, and distribution when not linked
into another program.)
Note that people who make modified versions of this file are not
obligated to grant this special exception for their modified
versions; it is their choice whether to do so. The GNU Lesser
General Public License gives permission to release a modified
version without this exception; this exception also makes it
possible to release a modified version which carries forward this
exception.
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/>. */
#define __ASSEMBLY__ 1
#include <entry.h>
#include <sysdep.h>
#include <sys/asm.h>
/* The entry point's job is to call __libc_start_main. Per the ABI,
a0 contains the address of a function to be passed to atexit.
__libc_start_main wants this in a5. */
ENTRY (ENTRY_POINT)
call .Lload_gp
mv a5, a0 /* rtld_fini. */
/* main may be in a shared library. */
la a0, main
REG_L a1, 0(sp) /* argc. */
addi a2, sp, SZREG /* argv. */
andi sp, sp, ALMASK /* Align stack. */
lla a3, __libc_csu_init
lla a4, __libc_csu_fini
mv a6, sp /* stack_end. */
tail __libc_start_main@plt
END (ENTRY_POINT)
/* Dynamic links need the global pointer to be initialized prior to calling
any shared library's initializers, so we use preinit_array to load it.
This doesn't cut it for static links, though, since the global pointer
needs to be initialized before calling __libc_start_main in that case.
So we redundantly initialize it at the beginning of _start. */
.Lload_gp:
.option push
.option norelax
lla gp, __global_pointer$
.option pop
ret
.section .preinit_array,"aw"
.dc.a .Lload_gp
/* Define a symbol for the first piece of initialized data. */
.data
.globl __data_start
__data_start:
.weak data_start
data_start = __data_start

63
sysdeps/riscv/sys/asm.h Normal file
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/* Miscellaneous macros.
Copyright (C) 2000-2018 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/>. */
#ifndef _SYS_ASM_H
#define _SYS_ASM_H
/* Macros to handle different pointer/register sizes for 32/64-bit code. */
#if __riscv_xlen == 64
# define PTRLOG 3
# define SZREG 8
# define REG_S sd
# define REG_L ld
#elif __riscv_xlen == 32
# error "rv32i-based targets are not supported"
#else
# error __riscv_xlen must equal 32 or 64
#endif
#if !defined __riscv_float_abi_soft
/* For ABI uniformity, reserve 8 bytes for floats, even if double-precision
floating-point is not supported in hardware. */
# if defined __riscv_float_abi_double
# define FREG_L fld
# define FREG_S fsd
# define SZFREG 8
# else
# error unsupported FLEN
# endif
#endif
/* Declare leaf routine. */
#define LEAF(symbol) \
.globl symbol; \
.align 2; \
.type symbol,@function; \
symbol: \
cfi_startproc;
/* Mark end of function. */
#undef END
#define END(function) \
cfi_endproc; \
.size function,.-function
/* Stack alignment. */
#define ALMASK ~15
#endif /* sys/asm.h */

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/* Macros to support TLS testing in times of missing compiler support.
Copyright (C) 2017-2018 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 <sys/cdefs.h>
#include <sys/asm.h>
#include <sysdep.h>
#include "dl-tls.h"
#define LOAD_GP \
".option push\n\t" \
".option norelax\n\t" \
"la gp, __global_pointer$\n\t" \
".option pop\n\t"
#define UNLOAD_GP
#define TLS_GD(x) \
({ void *__result; \
asm (LOAD_GP \
"la.tls.gd %0, " #x "\n\t" \
UNLOAD_GP \
: "=r" (__result)); \
__tls_get_addr (__result); })
#define TLS_LD(x) TLS_GD(x)
#define TLS_IE(x) \
({ void *__result; \
asm (LOAD_GP \
"la.tls.ie %0, " #x "\n\t" \
"add %0, %0, tp\n\t" \
UNLOAD_GP \
: "=r" (__result)); \
__result; })
#define TLS_LE(x) \
({ void *__result; \
asm (LOAD_GP \
"lui %0, %%tprel_hi(" #x ")\n\t" \
"add %0, %0, tp, %%tprel_add(" #x ")\n\t" \
"addi %0, %0, %%tprel_lo(" #x ")\n\t" \
UNLOAD_GP \
: "=r" (__result)); \
__result; })

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sysdeps/riscv/tst-audit.h Normal file
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/* Definitions for testing PLT entry/exit auditing. RISC-V version.
Copyright (C) 2005-2018 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/>. */
#define pltenter la_riscv_gnu_pltenter
#define pltexit la_riscv_gnu_pltexit
#define La_regs La_riscv_regs
#define La_retval La_riscv_retval
#define int_retval lrv_a0