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[PATCH] Backport of RISC-V support for libffi
- From: Andreas Schwab <schwab at suse dot de>
- To: gcc-patches at gcc dot gnu dot org
- Date: Tue, 20 Mar 2018 11:50:01 +0100
- Subject: [PATCH] Backport of RISC-V support for libffi
This is a backport of <https://github.com/libffi/libffi/commit/3840d49aaa>
(the only difference to upstream is s/FFI_ALIGN/ALIGN/, as we don't have
commit bd72848c7a). This is needed for libgo.
Andreas.
* configure.host: Add RISC-V support.
* Makefile.am: Likewise.
* Makefile.in: Regenerate.
* src/riscv/ffi.c, src/riscv/ffitarget.h, src/riscv/sysv.S: New
files.
---
libffi/Makefile.am | 2 +
libffi/Makefile.in | 25 ++-
libffi/configure.host | 5 +
libffi/src/riscv/ffi.c | 445 +++++++++++++++++++++++++++++++++++++++++++
libffi/src/riscv/ffitarget.h | 68 +++++++
libffi/src/riscv/sysv.S | 214 +++++++++++++++++++++
6 files changed, 757 insertions(+), 2 deletions(-)
create mode 100644 libffi/src/riscv/ffi.c
create mode 100644 libffi/src/riscv/ffitarget.h
create mode 100644 libffi/src/riscv/sysv.S
diff --git a/libffi/Makefile.am b/libffi/Makefile.am
index dc43328536..37f5ecaf3c 100644
--- a/libffi/Makefile.am
+++ b/libffi/Makefile.am
@@ -138,6 +138,7 @@ noinst_HEADERS = \
src/or1k/ffitarget.h \
src/pa/ffitarget.h \
src/powerpc/ffitarget.h src/powerpc/asm.h src/powerpc/ffi_powerpc.h \
+ src/riscv/ffitarget.h \
src/s390/ffitarget.h \
src/sh/ffitarget.h \
src/sh64/ffitarget.h \
@@ -173,6 +174,7 @@ EXTRA_libffi_la_SOURCES = \
src/powerpc/linux64_closure.S src/powerpc/ppc_closure.S \
src/powerpc/aix.S src/powerpc/darwin.S src/powerpc/aix_closure.S \
src/powerpc/darwin_closure.S src/powerpc/ffi_darwin.c \
+ src/riscv/ffi.c src/riscv/sysv.S \
src/s390/ffi.c src/s390/sysv.S \
src/sh/ffi.c src/sh/sysv.S \
src/sh64/ffi.c src/sh64/sysv.S \
diff --git a/libffi/Makefile.in b/libffi/Makefile.in
index 8a99ee58b6..d395d3a8d3 100644
--- a/libffi/Makefile.in
+++ b/libffi/Makefile.in
@@ -432,6 +432,7 @@ noinst_HEADERS = \
src/or1k/ffitarget.h \
src/pa/ffitarget.h \
src/powerpc/ffitarget.h src/powerpc/asm.h src/powerpc/ffi_powerpc.h \
+ src/riscv/ffitarget.h \
src/s390/ffitarget.h \
src/sh/ffitarget.h \
src/sh64/ffitarget.h \
@@ -467,6 +468,7 @@ EXTRA_libffi_la_SOURCES = \
src/powerpc/linux64_closure.S src/powerpc/ppc_closure.S \
src/powerpc/aix.S src/powerpc/darwin.S src/powerpc/aix_closure.S \
src/powerpc/darwin_closure.S src/powerpc/ffi_darwin.c \
+ src/riscv/ffi.c src/riscv/sysv.S \
src/s390/ffi.c src/s390/sysv.S \
src/sh/ffi.c src/sh/sysv.S \
src/sh64/ffi.c src/sh64/sysv.S \
@@ -831,6 +833,16 @@ src/powerpc/darwin_closure.lo: src/powerpc/$(am__dirstamp) \
src/powerpc/$(DEPDIR)/$(am__dirstamp)
src/powerpc/ffi_darwin.lo: src/powerpc/$(am__dirstamp) \
src/powerpc/$(DEPDIR)/$(am__dirstamp)
+src/riscv/$(am__dirstamp):
+ @$(MKDIR_P) src/riscv
+ @: > src/riscv/$(am__dirstamp)
+src/riscv/$(DEPDIR)/$(am__dirstamp):
+ @$(MKDIR_P) src/riscv/$(DEPDIR)
+ @: > src/riscv/$(DEPDIR)/$(am__dirstamp)
+src/riscv/ffi.lo: src/riscv/$(am__dirstamp) \
+ src/riscv/$(DEPDIR)/$(am__dirstamp)
+src/riscv/sysv.lo: src/riscv/$(am__dirstamp) \
+ src/riscv/$(DEPDIR)/$(am__dirstamp)
src/s390/$(am__dirstamp):
@$(MKDIR_P) src/s390
@: > src/s390/$(am__dirstamp)
@@ -1051,6 +1063,10 @@ mostlyclean-compile:
-rm -f src/prep_cif.lo
-rm -f src/raw_api.$(OBJEXT)
-rm -f src/raw_api.lo
+ -rm -f src/riscv/ffi.$(OBJEXT)
+ -rm -f src/riscv/ffi.lo
+ -rm -f src/riscv/sysv.$(OBJEXT)
+ -rm -f src/riscv/sysv.lo
-rm -f src/s390/ffi.$(OBJEXT)
-rm -f src/s390/ffi.lo
-rm -f src/s390/sysv.$(OBJEXT)
@@ -1167,6 +1183,8 @@ distclean-compile:
@AMDEP_TRUE@@am__include@ @am__quote@src/powerpc/$(DEPDIR)/linux64_closure.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@src/powerpc/$(DEPDIR)/ppc_closure.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@src/powerpc/$(DEPDIR)/sysv.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@src/riscv/$(DEPDIR)/ffi.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@src/riscv/$(DEPDIR)/sysv.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@src/s390/$(DEPDIR)/ffi.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@src/s390/$(DEPDIR)/sysv.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@src/sh/$(DEPDIR)/ffi.Plo@am__quote@
@@ -1268,6 +1286,7 @@ clean-libtool:
-rm -rf src/or1k/.libs src/or1k/_libs
-rm -rf src/pa/.libs src/pa/_libs
-rm -rf src/powerpc/.libs src/powerpc/_libs
+ -rm -rf src/riscv/.libs src/riscv/_libs
-rm -rf src/s390/.libs src/s390/_libs
-rm -rf src/sh/.libs src/sh/_libs
-rm -rf src/sh64/.libs src/sh64/_libs
@@ -1672,6 +1691,8 @@ distclean-generic:
-rm -f src/pa/$(am__dirstamp)
-rm -f src/powerpc/$(DEPDIR)/$(am__dirstamp)
-rm -f src/powerpc/$(am__dirstamp)
+ -rm -f src/riscv/$(DEPDIR)/$(am__dirstamp)
+ -rm -f src/riscv/$(am__dirstamp)
-rm -f src/s390/$(DEPDIR)/$(am__dirstamp)
-rm -f src/s390/$(am__dirstamp)
-rm -f src/sh/$(DEPDIR)/$(am__dirstamp)
@@ -1701,7 +1722,7 @@ clean-am: clean-aminfo clean-generic clean-libtool \
distclean: distclean-multi distclean-recursive
-rm -f $(am__CONFIG_DISTCLEAN_FILES)
- -rm -rf src/$(DEPDIR) src/aarch64/$(DEPDIR) src/alpha/$(DEPDIR) src/arc/$(DEPDIR) src/arm/$(DEPDIR) src/avr32/$(DEPDIR) src/bfin/$(DEPDIR) src/cris/$(DEPDIR) src/frv/$(DEPDIR) src/ia64/$(DEPDIR) src/m32r/$(DEPDIR) src/m68k/$(DEPDIR) src/m88k/$(DEPDIR) src/metag/$(DEPDIR) src/microblaze/$(DEPDIR) src/mips/$(DEPDIR) src/moxie/$(DEPDIR) src/nios2/$(DEPDIR) src/or1k/$(DEPDIR) src/pa/$(DEPDIR) src/powerpc/$(DEPDIR) src/s390/$(DEPDIR) src/sh/$(DEPDIR) src/sh64/$(DEPDIR) src/sparc/$(DEPDIR) src/tile/$(DEPDIR) src/vax/$(DEPDIR) src/x86/$(DEPDIR) src/xtensa/$(DEPDIR)
+ -rm -rf src/$(DEPDIR) src/aarch64/$(DEPDIR) src/alpha/$(DEPDIR) src/arc/$(DEPDIR) src/arm/$(DEPDIR) src/avr32/$(DEPDIR) src/bfin/$(DEPDIR) src/cris/$(DEPDIR) src/frv/$(DEPDIR) src/ia64/$(DEPDIR) src/m32r/$(DEPDIR) src/m68k/$(DEPDIR) src/m88k/$(DEPDIR) src/metag/$(DEPDIR) src/microblaze/$(DEPDIR) src/mips/$(DEPDIR) src/moxie/$(DEPDIR) src/nios2/$(DEPDIR) src/or1k/$(DEPDIR) src/pa/$(DEPDIR) src/powerpc/$(DEPDIR) src/riscv/$(DEPDIR) src/s390/$(DEPDIR) src/sh/$(DEPDIR) src/sh64/$(DEPDIR) src/sparc/$(DEPDIR) src/tile/$(DEPDIR) src/vax/$(DEPDIR) src/x86/$(DEPDIR) src/xtensa/$(DEPDIR)
-rm -f Makefile
distclean-am: clean-am distclean-compile distclean-generic \
distclean-hdr distclean-libtool distclean-tags
@@ -1840,7 +1861,7 @@ installcheck-am:
maintainer-clean: maintainer-clean-multi maintainer-clean-recursive
-rm -f $(am__CONFIG_DISTCLEAN_FILES)
-rm -rf $(top_srcdir)/autom4te.cache
- -rm -rf src/$(DEPDIR) src/aarch64/$(DEPDIR) src/alpha/$(DEPDIR) src/arc/$(DEPDIR) src/arm/$(DEPDIR) src/avr32/$(DEPDIR) src/bfin/$(DEPDIR) src/cris/$(DEPDIR) src/frv/$(DEPDIR) src/ia64/$(DEPDIR) src/m32r/$(DEPDIR) src/m68k/$(DEPDIR) src/m88k/$(DEPDIR) src/metag/$(DEPDIR) src/microblaze/$(DEPDIR) src/mips/$(DEPDIR) src/moxie/$(DEPDIR) src/nios2/$(DEPDIR) src/or1k/$(DEPDIR) src/pa/$(DEPDIR) src/powerpc/$(DEPDIR) src/s390/$(DEPDIR) src/sh/$(DEPDIR) src/sh64/$(DEPDIR) src/sparc/$(DEPDIR) src/tile/$(DEPDIR) src/vax/$(DEPDIR) src/x86/$(DEPDIR) src/xtensa/$(DEPDIR)
+ -rm -rf src/$(DEPDIR) src/aarch64/$(DEPDIR) src/alpha/$(DEPDIR) src/arc/$(DEPDIR) src/arm/$(DEPDIR) src/avr32/$(DEPDIR) src/bfin/$(DEPDIR) src/cris/$(DEPDIR) src/frv/$(DEPDIR) src/ia64/$(DEPDIR) src/m32r/$(DEPDIR) src/m68k/$(DEPDIR) src/m88k/$(DEPDIR) src/metag/$(DEPDIR) src/microblaze/$(DEPDIR) src/mips/$(DEPDIR) src/moxie/$(DEPDIR) src/nios2/$(DEPDIR) src/or1k/$(DEPDIR) src/pa/$(DEPDIR) src/powerpc/$(DEPDIR) src/riscv/$(DEPDIR) src/s390/$(DEPDIR) src/sh/$(DEPDIR) src/sh64/$(DEPDIR) src/sparc/$(DEPDIR) src/tile/$(DEPDIR) src/vax/$(DEPDIR) src/x86/$(DEPDIR) src/xtensa/$(DEPDIR)
-rm -f Makefile
maintainer-clean-am: distclean-am maintainer-clean-aminfo \
maintainer-clean-generic maintainer-clean-vti
diff --git a/libffi/configure.host b/libffi/configure.host
index 24fbfc438f..786b32c5bb 100644
--- a/libffi/configure.host
+++ b/libffi/configure.host
@@ -195,6 +195,11 @@ case "${host}" in
TARGET=POWERPC; TARGETDIR=powerpc
;;
+ riscv*-*)
+ TARGET=RISCV; TARGETDIR=riscv
+ SOURCES="ffi.c sysv.S"
+ ;;
+
s390-*-* | s390x-*-*)
TARGET=S390; TARGETDIR=s390
SOURCES="ffi.c sysv.S"
diff --git a/libffi/src/riscv/ffi.c b/libffi/src/riscv/ffi.c
new file mode 100644
index 0000000000..b664ee7d4e
--- /dev/null
+++ b/libffi/src/riscv/ffi.c
@@ -0,0 +1,445 @@
+/* -----------------------------------------------------------------------
+ ffi.c - Copyright (c) 2015 Michael Knyszek <mknyszek@berkeley.edu>
+ 2015 Andrew Waterman <waterman@cs.berkeley.edu>
+ 2018 Stef O'Rear <sorear2@gmail.com>
+ Based on MIPS N32/64 port
+
+ RISC-V Foreign Function Interface
+
+ Permission is hereby granted, free of charge, to any person obtaining
+ a copy of this software and associated documentation files (the
+ ``Software''), to deal in the Software without restriction, including
+ without limitation the rights to use, copy, modify, merge, publish,
+ distribute, sublicense, and/or sell copies of the Software, and to
+ permit persons to whom the Software is furnished to do so, subject to
+ the following conditions:
+
+ The above copyright notice and this permission notice shall be included
+ in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ DEALINGS IN THE SOFTWARE.
+ ----------------------------------------------------------------------- */
+
+#include <ffi.h>
+#include <ffi_common.h>
+
+#include <stdlib.h>
+#include <stdint.h>
+
+#if __riscv_float_abi_double
+#define ABI_FLEN 64
+#define ABI_FLOAT double
+#elif __riscv_float_abi_single
+#define ABI_FLEN 32
+#define ABI_FLOAT float
+#endif
+
+#define NARGREG 8
+#define STKALIGN 16
+#define MAXCOPYARG (2 * sizeof(double))
+
+typedef struct call_context
+{
+#if ABI_FLEN
+ ABI_FLOAT fa[8];
+#endif
+ size_t a[8];
+ /* used by the assembly code to in-place construct its own stack frame */
+ char frame[16];
+} call_context;
+
+typedef struct call_builder
+{
+ call_context *aregs;
+ int used_integer;
+ int used_float;
+ size_t *used_stack;
+} call_builder;
+
+/* integer (not pointer) less than ABI XLEN */
+/* FFI_TYPE_INT does not appear to be used */
+#if __SIZEOF_POINTER__ == 8
+#define IS_INT(type) ((type) >= FFI_TYPE_UINT8 && (type) <= FFI_TYPE_SINT64)
+#else
+#define IS_INT(type) ((type) >= FFI_TYPE_UINT8 && (type) <= FFI_TYPE_SINT32)
+#endif
+
+#if ABI_FLEN
+typedef struct {
+ char as_elements, type1, offset2, type2;
+} float_struct_info;
+
+#if ABI_FLEN >= 64
+#define IS_FLOAT(type) ((type) >= FFI_TYPE_FLOAT && (type) <= FFI_TYPE_DOUBLE)
+#else
+#define IS_FLOAT(type) ((type) == FFI_TYPE_FLOAT)
+#endif
+
+static ffi_type **flatten_struct(ffi_type *in, ffi_type **out, ffi_type **out_end) {
+ int i;
+ if (out == out_end) return out;
+ if (in->type != FFI_TYPE_STRUCT) {
+ *(out++) = in;
+ } else {
+ for (i = 0; in->elements[i]; i++)
+ out = flatten_struct(in->elements[i], out, out_end);
+ }
+ return out;
+}
+
+/* Structs with at most two fields after flattening, one of which is of
+ floating point type, are passed in multiple registers if sufficient
+ registers are available. */
+static float_struct_info struct_passed_as_elements(call_builder *cb, ffi_type *top) {
+ float_struct_info ret = {0, 0, 0, 0};
+ ffi_type *fields[3];
+ int num_floats, num_ints;
+ int num_fields = flatten_struct(top, fields, fields + 3) - fields;
+
+ if (num_fields == 1) {
+ if (IS_FLOAT(fields[0]->type)) {
+ ret.as_elements = 1;
+ ret.type1 = fields[0]->type;
+ }
+ } else if (num_fields == 2) {
+ num_floats = IS_FLOAT(fields[0]->type) + IS_FLOAT(fields[1]->type);
+ num_ints = IS_INT(fields[0]->type) + IS_INT(fields[1]->type);
+ if (num_floats == 0 || num_floats + num_ints != 2)
+ return ret;
+ if (cb->used_float + num_floats > NARGREG || cb->used_integer + (2 - num_floats) > NARGREG)
+ return ret;
+ if (!IS_FLOAT(fields[0]->type) && !IS_FLOAT(fields[1]->type))
+ return ret;
+
+ ret.type1 = fields[0]->type;
+ ret.type2 = fields[1]->type;
+ ret.offset2 = ALIGN(fields[0]->size, fields[1]->alignment);
+ ret.as_elements = 1;
+ }
+
+ return ret;
+}
+#endif
+
+/* allocates a single register, float register, or XLEN-sized stack slot to a datum */
+static void marshal_atom(call_builder *cb, int type, void *data) {
+ size_t value = 0;
+ switch (type) {
+ case FFI_TYPE_UINT8: value = *(uint8_t *)data; break;
+ case FFI_TYPE_SINT8: value = *(int8_t *)data; break;
+ case FFI_TYPE_UINT16: value = *(uint16_t *)data; break;
+ case FFI_TYPE_SINT16: value = *(int16_t *)data; break;
+ /* 32-bit quantities are always sign-extended in the ABI */
+ case FFI_TYPE_UINT32: value = *(int32_t *)data; break;
+ case FFI_TYPE_SINT32: value = *(int32_t *)data; break;
+#if __SIZEOF_POINTER__ == 8
+ case FFI_TYPE_UINT64: value = *(uint64_t *)data; break;
+ case FFI_TYPE_SINT64: value = *(int64_t *)data; break;
+#endif
+ case FFI_TYPE_POINTER: value = *(size_t *)data; break;
+
+ /* float values may be recoded in an implementation-defined way
+ by hardware conforming to 2.1 or earlier, so use asm to
+ reinterpret floats as doubles */
+#if ABI_FLEN >= 32
+ case FFI_TYPE_FLOAT:
+ asm("" : "=f"(cb->aregs->fa[cb->used_float++]) : "0"(*(float *)data));
+ return;
+#endif
+#if ABI_FLEN >= 64
+ case FFI_TYPE_DOUBLE:
+ asm("" : "=f"(cb->aregs->fa[cb->used_float++]) : "0"(*(double *)data));
+ return;
+#endif
+ default: FFI_ASSERT(0); break;
+ }
+
+ if (cb->used_integer == NARGREG) {
+ *cb->used_stack++ = value;
+ } else {
+ cb->aregs->a[cb->used_integer++] = value;
+ }
+}
+
+static void unmarshal_atom(call_builder *cb, int type, void *data) {
+ size_t value;
+ switch (type) {
+#if ABI_FLEN >= 32
+ case FFI_TYPE_FLOAT:
+ asm("" : "=f"(*(float *)data) : "0"(cb->aregs->fa[cb->used_float++]));
+ return;
+#endif
+#if ABI_FLEN >= 64
+ case FFI_TYPE_DOUBLE:
+ asm("" : "=f"(*(double *)data) : "0"(cb->aregs->fa[cb->used_float++]));
+ return;
+#endif
+ }
+
+ if (cb->used_integer == NARGREG) {
+ value = *cb->used_stack++;
+ } else {
+ value = cb->aregs->a[cb->used_integer++];
+ }
+
+ switch (type) {
+ case FFI_TYPE_UINT8: *(uint8_t *)data = value; break;
+ case FFI_TYPE_SINT8: *(uint8_t *)data = value; break;
+ case FFI_TYPE_UINT16: *(uint16_t *)data = value; break;
+ case FFI_TYPE_SINT16: *(uint16_t *)data = value; break;
+ case FFI_TYPE_UINT32: *(uint32_t *)data = value; break;
+ case FFI_TYPE_SINT32: *(uint32_t *)data = value; break;
+#if __SIZEOF_POINTER__ == 8
+ case FFI_TYPE_UINT64: *(uint64_t *)data = value; break;
+ case FFI_TYPE_SINT64: *(uint64_t *)data = value; break;
+#endif
+ case FFI_TYPE_POINTER: *(size_t *)data = value; break;
+ default: FFI_ASSERT(0); break;
+ }
+}
+
+/* adds an argument to a call, or a not by reference return value */
+static void marshal(call_builder *cb, ffi_type *type, int var, void *data) {
+ size_t realign[2];
+
+#if ABI_FLEN
+ if (!var && type->type == FFI_TYPE_STRUCT) {
+ float_struct_info fsi = struct_passed_as_elements(cb, type);
+ if (fsi.as_elements) {
+ marshal_atom(cb, fsi.type1, data);
+ if (fsi.offset2)
+ marshal_atom(cb, fsi.type2, ((char*)data) + fsi.offset2);
+ return;
+ }
+ }
+
+ if (!var && cb->used_float < NARGREG && IS_FLOAT(type->type)) {
+ marshal_atom(cb, type->type, data);
+ return;
+ }
+#endif
+
+ if (type->size > 2 * __SIZEOF_POINTER__) {
+ /* pass by reference */
+ marshal_atom(cb, FFI_TYPE_POINTER, &data);
+ } else if (IS_INT(type->type) || type->type == FFI_TYPE_POINTER) {
+ marshal_atom(cb, type->type, data);
+ } else {
+ /* overlong integers, soft-float floats, and structs without special
+ float handling are treated identically from this point on */
+
+ /* variadics are aligned even in registers */
+ if (type->alignment > __SIZEOF_POINTER__) {
+ if (var)
+ cb->used_integer = ALIGN(cb->used_integer, 2);
+ cb->used_stack = (size_t *)ALIGN(cb->used_stack, 2*__SIZEOF_POINTER__);
+ }
+
+ memcpy(realign, data, type->size);
+ if (type->size > 0)
+ marshal_atom(cb, FFI_TYPE_POINTER, realign);
+ if (type->size > __SIZEOF_POINTER__)
+ marshal_atom(cb, FFI_TYPE_POINTER, realign + 1);
+ }
+}
+
+/* for arguments passed by reference returns the pointer, otherwise the arg is copied (up to MAXCOPYARG bytes) */
+static void *unmarshal(call_builder *cb, ffi_type *type, int var, void *data) {
+ size_t realign[2];
+ void *pointer;
+
+#if ABI_FLEN
+ if (!var && type->type == FFI_TYPE_STRUCT) {
+ float_struct_info fsi = struct_passed_as_elements(cb, type);
+ if (fsi.as_elements) {
+ unmarshal_atom(cb, fsi.type1, data);
+ if (fsi.offset2)
+ unmarshal_atom(cb, fsi.type2, ((char*)data) + fsi.offset2);
+ return data;
+ }
+ }
+
+ if (!var && cb->used_float < NARGREG && IS_FLOAT(type->type)) {
+ unmarshal_atom(cb, type->type, data);
+ return data;
+ }
+#endif
+
+ if (type->size > 2 * __SIZEOF_POINTER__) {
+ /* pass by reference */
+ unmarshal_atom(cb, FFI_TYPE_POINTER, (char*)&pointer);
+ return pointer;
+ } else if (IS_INT(type->type) || type->type == FFI_TYPE_POINTER) {
+ unmarshal_atom(cb, type->type, data);
+ return data;
+ } else {
+ /* overlong integers, soft-float floats, and structs without special
+ float handling are treated identically from this point on */
+
+ /* variadics are aligned even in registers */
+ if (type->alignment > __SIZEOF_POINTER__) {
+ if (var)
+ cb->used_integer = ALIGN(cb->used_integer, 2);
+ cb->used_stack = (size_t *)ALIGN(cb->used_stack, 2*__SIZEOF_POINTER__);
+ }
+
+ if (type->size > 0)
+ unmarshal_atom(cb, FFI_TYPE_POINTER, realign);
+ if (type->size > __SIZEOF_POINTER__)
+ unmarshal_atom(cb, FFI_TYPE_POINTER, realign + 1);
+ memcpy(data, realign, type->size);
+ return data;
+ }
+}
+
+static int passed_by_ref(call_builder *cb, ffi_type *type, int var) {
+#if ABI_FLEN
+ if (!var && type->type == FFI_TYPE_STRUCT) {
+ float_struct_info fsi = struct_passed_as_elements(cb, type);
+ if (fsi.as_elements) return 0;
+ }
+#endif
+
+ return type->size > 2 * __SIZEOF_POINTER__;
+}
+
+/* Perform machine dependent cif processing */
+ffi_status ffi_prep_cif_machdep(ffi_cif *cif) {
+ cif->riscv_nfixedargs = cif->nargs;
+ return FFI_OK;
+}
+
+/* Perform machine dependent cif processing when we have a variadic function */
+
+ffi_status ffi_prep_cif_machdep_var(ffi_cif *cif, unsigned int nfixedargs, unsigned int ntotalargs) {
+ cif->riscv_nfixedargs = nfixedargs;
+ return FFI_OK;
+}
+
+/* Low level routine for calling functions */
+extern void ffi_call_asm(void *stack, struct call_context *regs, void (*fn)(void)) FFI_HIDDEN;
+
+void ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
+{
+ /* this is a conservative estimate, assuming a complex return value and
+ that all remaining arguments are long long / __int128 */
+ size_t arg_bytes = cif->nargs <= 3 ? 0 :
+ ALIGN(2 * sizeof(size_t) * (cif->nargs - 3), STKALIGN);
+ size_t rval_bytes = 0;
+ if (rvalue == NULL && cif->rtype->size > 2*__SIZEOF_POINTER__)
+ rval_bytes = ALIGN(cif->rtype->size, STKALIGN);
+ size_t alloc_size = arg_bytes + rval_bytes + sizeof(call_context);
+
+ /* the assembly code will deallocate all stack data at lower addresses
+ than the argument region, so we need to allocate the frame and the
+ return value after the arguments in a single allocation */
+ size_t alloc_base;
+ /* Argument region must be 16-byte aligned */
+ if (_Alignof(max_align_t) >= STKALIGN) {
+ /* since sizeof long double is normally 16, the compiler will
+ guarantee alloca alignment to at least that much */
+ alloc_base = (size_t)alloca(alloc_size);
+ } else {
+ alloc_base = ALIGN(alloca(alloc_size + STKALIGN - 1), STKALIGN);
+ }
+
+ if (rval_bytes)
+ rvalue = (void*)(alloc_base + arg_bytes);
+
+ call_builder cb;
+ cb.used_float = cb.used_integer = 0;
+ cb.aregs = (call_context*)(alloc_base + arg_bytes + rval_bytes);
+ cb.used_stack = (void*)alloc_base;
+
+ int return_by_ref = passed_by_ref(&cb, cif->rtype, 0);
+ if (return_by_ref)
+ marshal(&cb, &ffi_type_pointer, 0, &rvalue);
+
+ int i;
+ for (i = 0; i < cif->nargs; i++)
+ marshal(&cb, cif->arg_types[i], i >= cif->riscv_nfixedargs, avalue[i]);
+
+ ffi_call_asm((void*)alloc_base, cb.aregs, fn);
+
+ cb.used_float = cb.used_integer = 0;
+ if (!return_by_ref && rvalue)
+ unmarshal(&cb, cif->rtype, 0, rvalue);
+}
+
+extern void ffi_closure_asm(void) FFI_HIDDEN;
+
+ffi_status ffi_prep_closure_loc(ffi_closure *closure, ffi_cif *cif, void (*fun)(ffi_cif*,void*,void**,void*), void *user_data, void *codeloc)
+{
+ uint32_t *tramp = (uint32_t *) &closure->tramp[0];
+ uint64_t fn = (uint64_t) (uintptr_t) ffi_closure_asm;
+
+ if (cif->abi <= FFI_FIRST_ABI || cif->abi >= FFI_LAST_ABI)
+ return FFI_BAD_ABI;
+
+ /* we will call ffi_closure_inner with codeloc, not closure, but as long
+ as the memory is readable it should work */
+
+ tramp[0] = 0x00000317; /* auipc t1, 0 (i.e. t0 <- codeloc) */
+#if __SIZEOF_POINTER__ == 8
+ tramp[1] = 0x01033383; /* ld t2, 16(t1) */
+#else
+ tramp[1] = 0x01032383; /* lw t2, 16(t1) */
+#endif
+ tramp[2] = 0x00038067; /* jr t2 */
+ tramp[3] = 0x00000013; /* nop */
+ tramp[4] = fn;
+ tramp[5] = fn >> 32;
+
+ closure->cif = cif;
+ closure->fun = fun;
+ closure->user_data = user_data;
+
+ __builtin___clear_cache(codeloc, codeloc + FFI_TRAMPOLINE_SIZE);
+
+ return FFI_OK;
+}
+
+/* Called by the assembly code with aregs pointing to saved argument registers
+ and stack pointing to the stacked arguments. Return values passed in
+ registers will be reloaded from aregs. */
+void FFI_HIDDEN ffi_closure_inner(size_t *stack, call_context *aregs, ffi_closure *closure) {
+ ffi_cif *cif = closure->cif;
+ void **avalue = alloca(cif->nargs * sizeof(void*));
+ /* storage for arguments which will be copied by unmarshal(). We could
+ theoretically avoid the copies in many cases and use at most 128 bytes
+ of memory, but allocating disjoint storage for each argument is
+ simpler. */
+ char *astorage = alloca(cif->nargs * MAXCOPYARG);
+ void *rvalue;
+ call_builder cb;
+ int return_by_ref;
+ int i;
+
+ cb.aregs = aregs;
+ cb.used_integer = cb.used_float = 0;
+ cb.used_stack = stack;
+
+ return_by_ref = passed_by_ref(&cb, cif->rtype, 0);
+ if (return_by_ref)
+ unmarshal(&cb, &ffi_type_pointer, 0, &rvalue);
+ else
+ rvalue = alloca(cif->rtype->size);
+
+ for (i = 0; i < cif->nargs; i++)
+ avalue[i] = unmarshal(&cb, cif->arg_types[i],
+ i >= cif->riscv_nfixedargs, astorage + i*MAXCOPYARG);
+
+ (closure->fun)(cif, rvalue, avalue, closure->user_data);
+
+ if (!return_by_ref && cif->rtype->type != FFI_TYPE_VOID) {
+ cb.used_integer = cb.used_float = 0;
+ marshal(&cb, cif->rtype, 0, rvalue);
+ }
+}
diff --git a/libffi/src/riscv/ffitarget.h b/libffi/src/riscv/ffitarget.h
new file mode 100644
index 0000000000..fcaa899153
--- /dev/null
+++ b/libffi/src/riscv/ffitarget.h
@@ -0,0 +1,68 @@
+/* -----------------------------------------------------------------*-C-*-
+ ffitarget.h - 2014 Michael Knyszek
+
+ Target configuration macros for RISC-V.
+
+ Permission is hereby granted, free of charge, to any person obtaining
+ a copy of this software and associated documentation files (the
+ ``Software''), to deal in the Software without restriction, including
+ without limitation the rights to use, copy, modify, merge, publish,
+ distribute, sublicense, and/or sell copies of the Software, and to
+ permit persons to whom the Software is furnished to do so, subject to
+ the following conditions:
+
+ The above copyright notice and this permission notice shall be included
+ in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ DEALINGS IN THE SOFTWARE.
+
+ ----------------------------------------------------------------------- */
+
+#ifndef LIBFFI_TARGET_H
+#define LIBFFI_TARGET_H
+
+#ifndef LIBFFI_H
+#error "Please do not include ffitarget.h directly into your source. Use ffi.h instead."
+#endif
+
+#ifndef __riscv
+#error "libffi was configured for a RISC-V target but this does not appear to be a RISC-V compiler."
+#endif
+
+#ifndef LIBFFI_ASM
+
+typedef unsigned long ffi_arg;
+typedef signed long ffi_sarg;
+
+/* FFI_UNUSED_NN and riscv_unused are to maintain ABI compatibility with a
+ distributed Berkeley patch from 2014, and can be removed at SONAME bump */
+typedef enum ffi_abi {
+ FFI_FIRST_ABI = 0,
+ FFI_SYSV,
+ FFI_UNUSED_1,
+ FFI_UNUSED_2,
+ FFI_UNUSED_3,
+ FFI_LAST_ABI,
+
+ FFI_DEFAULT_ABI = FFI_SYSV
+} ffi_abi;
+
+#endif /* LIBFFI_ASM */
+
+/* ---- Definitions for closures ----------------------------------------- */
+
+#define FFI_CLOSURES 1
+#define FFI_TRAMPOLINE_SIZE 24
+#define FFI_NATIVE_RAW_API 0
+#define FFI_EXTRA_CIF_FIELDS unsigned riscv_nfixedargs; unsigned riscv_unused;
+#define FFI_TARGET_SPECIFIC_VARIADIC
+
+#endif
+
diff --git a/libffi/src/riscv/sysv.S b/libffi/src/riscv/sysv.S
new file mode 100644
index 0000000000..2d098651d0
--- /dev/null
+++ b/libffi/src/riscv/sysv.S
@@ -0,0 +1,214 @@
+/* -----------------------------------------------------------------------
+ ffi.c - Copyright (c) 2015 Michael Knyszek <mknyszek@berkeley.edu>
+ 2015 Andrew Waterman <waterman@cs.berkeley.edu>
+ 2018 Stef O'Rear <sorear2@gmail.com>
+
+ RISC-V Foreign Function Interface
+
+ Permission is hereby granted, free of charge, to any person obtaining
+ a copy of this software and associated documentation files (the
+ ``Software''), to deal in the Software without restriction, including
+ without limitation the rights to use, copy, modify, merge, publish,
+ distribute, sublicense, and/or sell copies of the Software, and to
+ permit persons to whom the Software is furnished to do so, subject to
+ the following conditions:
+
+ The above copyright notice and this permission notice shall be included
+ in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ DEALINGS IN THE SOFTWARE.
+ ----------------------------------------------------------------------- */
+
+#define LIBFFI_ASM
+#include <fficonfig.h>
+#include <ffi.h>
+
+/* Define aliases so that we can handle all ABIs uniformly */
+
+#if __SIZEOF_POINTER__ == 8
+#define PTRS 8
+#define LARG ld
+#define SARG sd
+#else
+#define PTRS 4
+#define LARG lw
+#define SARG sw
+#endif
+
+#if __riscv_float_abi_double
+#define FLTS 8
+#define FLARG fld
+#define FSARG fsd
+#elif __riscv_float_abi_single
+#define FLTS 4
+#define FLARG flw
+#define FSARG fsw
+#else
+#define FLTS 0
+#endif
+
+#define fp s0
+
+ .text
+ .globl ffi_call_asm
+ .type ffi_call_asm, @function
+ .hidden ffi_call_asm
+/*
+ struct call_context {
+ floatreg fa[8];
+ intreg a[8];
+ intreg pad[rv32 ? 2 : 0];
+ intreg save_fp, save_ra;
+ }
+ void ffi_call_asm(size_t *stackargs, struct call_context *regargs,
+ void (*fn)(void));
+*/
+
+#define FRAME_LEN (8 * FLTS + 8 * PTRS + 16)
+
+ffi_call_asm:
+ .cfi_startproc
+
+ /*
+ We are NOT going to set up an ordinary stack frame. In order to pass
+ the stacked args to the called function, we adjust our stack pointer to
+ a0, which is in the _caller's_ alloca area. We establish our own stack
+ frame at the end of the call_context.
+
+ Anything below the arguments will be freed at this point, although we
+ preserve the call_context so that it can be read back in the caller.
+ */
+
+ .cfi_def_cfa 11, FRAME_LEN # interim CFA based on a1
+ SARG fp, FRAME_LEN - 2*PTRS(a1)
+ .cfi_offset 8, -2*PTRS
+ SARG ra, FRAME_LEN - 1*PTRS(a1)
+ .cfi_offset 1, -1*PTRS
+
+ addi fp, a1, FRAME_LEN
+ mv sp, a0
+ .cfi_def_cfa 8, 0 # our frame is fully set up
+
+ # Load arguments
+ mv t1, a2
+
+#if FLTS
+ FLARG fa0, -FRAME_LEN+0*FLTS(fp)
+ FLARG fa1, -FRAME_LEN+1*FLTS(fp)
+ FLARG fa2, -FRAME_LEN+2*FLTS(fp)
+ FLARG fa3, -FRAME_LEN+3*FLTS(fp)
+ FLARG fa4, -FRAME_LEN+4*FLTS(fp)
+ FLARG fa5, -FRAME_LEN+5*FLTS(fp)
+ FLARG fa6, -FRAME_LEN+6*FLTS(fp)
+ FLARG fa7, -FRAME_LEN+7*FLTS(fp)
+#endif
+
+ LARG a0, -FRAME_LEN+8*FLTS+0*PTRS(fp)
+ LARG a1, -FRAME_LEN+8*FLTS+1*PTRS(fp)
+ LARG a2, -FRAME_LEN+8*FLTS+2*PTRS(fp)
+ LARG a3, -FRAME_LEN+8*FLTS+3*PTRS(fp)
+ LARG a4, -FRAME_LEN+8*FLTS+4*PTRS(fp)
+ LARG a5, -FRAME_LEN+8*FLTS+5*PTRS(fp)
+ LARG a6, -FRAME_LEN+8*FLTS+6*PTRS(fp)
+ LARG a7, -FRAME_LEN+8*FLTS+7*PTRS(fp)
+
+ /* Call */
+ jalr t1
+
+ /* Save return values - only a0/a1 (fa0/fa1) are used */
+#if FLTS
+ FSARG fa0, -FRAME_LEN+0*FLTS(fp)
+ FSARG fa1, -FRAME_LEN+1*FLTS(fp)
+#endif
+
+ SARG a0, -FRAME_LEN+8*FLTS+0*PTRS(fp)
+ SARG a1, -FRAME_LEN+8*FLTS+1*PTRS(fp)
+
+ /* Restore and return */
+ addi sp, fp, -FRAME_LEN
+ .cfi_def_cfa 2, FRAME_LEN
+ LARG ra, -1*PTRS(fp)
+ .cfi_restore 1
+ LARG fp, -2*PTRS(fp)
+ .cfi_restore 8
+ ret
+ .cfi_endproc
+ .size ffi_call_asm, .-ffi_call_asm
+
+
+/*
+ ffi_closure_asm. Expects address of the passed-in ffi_closure in t1.
+ void ffi_closure_inner(size_t *stackargs, struct call_context *regargs,
+ ffi_closure *closure);
+*/
+
+ .globl ffi_closure_asm
+ .hidden ffi_closure_asm
+ .type ffi_closure_asm, @function
+ffi_closure_asm:
+ .cfi_startproc
+
+ addi sp, sp, -FRAME_LEN
+ .cfi_def_cfa_offset FRAME_LEN
+
+ /* make a frame */
+ SARG fp, FRAME_LEN - 2*PTRS(sp)
+ .cfi_offset 8, -2*PTRS
+ SARG ra, FRAME_LEN - 1*PTRS(sp)
+ .cfi_offset 1, -1*PTRS
+ addi fp, sp, FRAME_LEN
+
+ /* save arguments */
+#if FLTS
+ FSARG fa0, 0*FLTS(sp)
+ FSARG fa1, 1*FLTS(sp)
+ FSARG fa2, 2*FLTS(sp)
+ FSARG fa3, 3*FLTS(sp)
+ FSARG fa4, 4*FLTS(sp)
+ FSARG fa5, 5*FLTS(sp)
+ FSARG fa6, 6*FLTS(sp)
+ FSARG fa7, 7*FLTS(sp)
+#endif
+
+ SARG a0, 8*FLTS+0*PTRS(sp)
+ SARG a1, 8*FLTS+1*PTRS(sp)
+ SARG a2, 8*FLTS+2*PTRS(sp)
+ SARG a3, 8*FLTS+3*PTRS(sp)
+ SARG a4, 8*FLTS+4*PTRS(sp)
+ SARG a5, 8*FLTS+5*PTRS(sp)
+ SARG a6, 8*FLTS+6*PTRS(sp)
+ SARG a7, 8*FLTS+7*PTRS(sp)
+
+ /* enter C */
+ addi a0, sp, FRAME_LEN
+ mv a1, sp
+ mv a2, t1
+
+ call ffi_closure_inner
+
+ /* return values */
+#if FLTS
+ FLARG fa0, 0*FLTS(sp)
+ FLARG fa1, 1*FLTS(sp)
+#endif
+
+ LARG a0, 8*FLTS+0*PTRS(sp)
+ LARG a1, 8*FLTS+1*PTRS(sp)
+
+ /* restore and return */
+ LARG ra, FRAME_LEN-1*PTRS(sp)
+ .cfi_restore 1
+ LARG fp, FRAME_LEN-2*PTRS(sp)
+ .cfi_restore 8
+ addi sp, sp, FRAME_LEN
+ .cfi_def_cfa_offset 0
+ ret
+ .cfi_endproc
+ .size ffi_closure_asm, .-ffi_closure_asm
--
2.16.2
--
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."