From: chenglulu <chengl...@loongson.cn>
libgcc/
* config/loongarch/crtfastmath.c: New file.
* config/loongarch/crti.S: Like wise.
* config/loongarch/crtn.S: Like wise.
* config/loongarch/lib2funcs.c: Like wise.
* config/loongarch/linux-unwind.h: Like wise.
* config/loongarch/sfp-machine.h: Like wise.
* config/loongarch/t-crtstuff: Like wise.
* config/loongarch/t-elf: Like wise.
* config/loongarch/t-loongarch: Like wise.
* config/loongarch/t-loongarch64: Like wise.
* config/loongarch/t-softfp-tf: Like wise.
* config.host: Add LoongArch tuples.
* configure.ac: Add LoongArch support.
---
libgcc/config.host | 28 ++++-
libgcc/config/loongarch/crtfastmath.c | 52 +++++++++
libgcc/config/loongarch/crti.S | 43 +++++++
libgcc/config/loongarch/crtn.S | 39 +++++++
libgcc/config/loongarch/lib2funcs.c | 0
libgcc/config/loongarch/linux-unwind.h | 80 +++++++++++++
libgcc/config/loongarch/sfp-machine.h | 152 +++++++++++++++++++++++++
libgcc/config/loongarch/t-crtstuff | 5 +
libgcc/config/loongarch/t-elf | 3 +
libgcc/config/loongarch/t-loongarch | 9 ++
libgcc/config/loongarch/t-loongarch64 | 1 +
libgcc/config/loongarch/t-softfp-tf | 3 +
libgcc/configure.ac | 2 +-
13 files changed, 415 insertions(+), 2 deletions(-)
create mode 100644 libgcc/config/loongarch/crtfastmath.c
create mode 100644 libgcc/config/loongarch/crti.S
create mode 100644 libgcc/config/loongarch/crtn.S
create mode 100644 libgcc/config/loongarch/lib2funcs.c
create mode 100644 libgcc/config/loongarch/linux-unwind.h
create mode 100644 libgcc/config/loongarch/sfp-machine.h
create mode 100644 libgcc/config/loongarch/t-crtstuff
create mode 100644 libgcc/config/loongarch/t-elf
create mode 100644 libgcc/config/loongarch/t-loongarch
create mode 100644 libgcc/config/loongarch/t-loongarch64
create mode 100644 libgcc/config/loongarch/t-softfp-tf
diff --git a/libgcc/config.host b/libgcc/config.host
index 094fd3ad254..8c56fcae5d2 100644
--- a/libgcc/config.host
+++ b/libgcc/config.host
@@ -138,6 +138,22 @@ hppa*-*-*)
lm32*-*-*)
cpu_type=lm32
;;
+loongarch*-*-*)
+ cpu_type=loongarch
+ tmake_file="loongarch/t-loongarch"
+ if test "${libgcc_cv_loongarch_hard_float}" = yes; then
+ tmake_file="${tmake_file} t-hardfp-sfdf t-hardfp"
+ else
+ tmake_file="${tmake_file} t-softfp-sfdf"
+ fi
+ if test "${ac_cv_sizeof_long_double}" = 16; then
+ tmake_file="${tmake_file} loongarch/t-softfp-tf"
+ fi
+ if test "${host_address}" = 64; then
+ tmake_file="${tmake_file} loongarch/t-loongarch64"
+ fi
+ tmake_file="${tmake_file} t-softfp"
+ ;;
m32r*-*-*)
cpu_type=m32r
;;
@@ -925,7 +941,17 @@ lm32-*-rtems*)
lm32-*-uclinux*)
extra_parts="$extra_parts crtbegin.o crtendS.o crtbeginT.o"
tmake_file="lm32/t-lm32 lm32/t-uclinux t-libgcc-pic t-softfp-sfdf
t-softfp"
- ;;
+ ;;
+loongarch*-*-linux*)
+ extra_parts="$extra_parts crtfastmath.o"
+ tmake_file="${tmake_file} t-crtfm loongarch/t-crtstuff"
+ case ${host} in
+ *)
+ tmake_file="${tmake_file} t-slibgcc-libgcc"
+ ;;
+ esac
+ md_unwind_header=loongarch/linux-unwind.h
+ ;;
m32r-*-elf*)
tmake_file="$tmake_file m32r/t-m32r t-fdpbit"
extra_parts="$extra_parts crtinit.o crtfini.o"
diff --git a/libgcc/config/loongarch/crtfastmath.c
b/libgcc/config/loongarch/crtfastmath.c
new file mode 100644
index 00000000000..3523d531e2b
--- /dev/null
+++ b/libgcc/config/loongarch/crtfastmath.c
@@ -0,0 +1,52 @@
+/* Copyright (C) 2021 Free Software Foundation, Inc.
+ Contributed by Loongson Ltd.
+ Based on MIPS target for GNU compiler.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC 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 General Public
+License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License
+and a copy of the GCC Runtime Library Exception along with this
+program; see the files COPYING3 and COPYING.RUNTIME respectively.
+If not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef __loongarch_hard_float
+
+/* Rounding control. */
+#define _FPU_RC_NEAREST 0x000 /* RECOMMENDED. */
+#define _FPU_RC_ZERO 0x100
+#define _FPU_RC_UP 0x200
+#define _FPU_RC_DOWN 0x300
+
+/* Enable interrupts for IEEE exceptions. */
+#define _FPU_IEEE 0x0000001F
+
+/* Macros for accessing the hardware control word. */
+#define _FPU_GETCW(cw) __asm__ volatile ("movfcsr2gr %0,$r0" : "=r" (cw))
+#define _FPU_SETCW(cw) __asm__ volatile ("movgr2fcsr $r0,%0" : : "r" (cw))
+
+static void __attribute__((constructor))
+set_fast_math (void)
+{
+ unsigned int fcr;
+
+ /* Flush to zero, round to nearest, IEEE exceptions disabled. */
+ fcr = _FPU_RC_NEAREST;
+
+ _FPU_SETCW (fcr);
+}
+
+#endif /* __loongarch_hard_float */
diff --git a/libgcc/config/loongarch/crti.S b/libgcc/config/loongarch/crti.S
new file mode 100644
index 00000000000..bac029874b5
--- /dev/null
+++ b/libgcc/config/loongarch/crti.S
@@ -0,0 +1,43 @@
+/* Copyright (C) 2021 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC 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 General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
+
+/* 4 slots for argument spill area. 1 for cpreturn, 1 for stack.
+ Return spill offset of 8. Aligned to 16 bytes for lp64. */
+
+ .section .init,"ax",@progbits
+ .globl _init
+ .type _init,@function
+_init:
+ addi.d $r3,$r3,-16
+ st.d $r1,$r3,8
+ addi.d $r3,$r3,16
+ jirl $r0,$r1,0
+
+ .section .fini,"ax",@progbits
+ .globl _fini
+ .type _fini,@function
+_fini:
+ addi.d $r3,$r3,-16
+ st.d $r1,$r3,8
+ addi.d $r3,$r3,16
+ jirl $r0,$r1,0
diff --git a/libgcc/config/loongarch/crtn.S b/libgcc/config/loongarch/crtn.S
new file mode 100644
index 00000000000..7af6728690f
--- /dev/null
+++ b/libgcc/config/loongarch/crtn.S
@@ -0,0 +1,39 @@
+/* Copyright (C) 2021 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC 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 General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
+
+/* 4 slots for argument spill area. 1 for cpreturn, 1 for stack.
+ Return spill offset of 8. Aligned to 16 bytes for lp64. */
+
+
+ .section .init,"ax",@progbits
+init:
+ ld.d $r1,$r3,8
+ addi.d $r3,$r3,16
+ jirl $r0,$r1,0
+
+ .section .fini,"ax",@progbits
+fini:
+ ld.d $r1,$r3,8
+ addi.d $r3,$r3,16
+ jirl $r0,$r1,0
+
diff --git a/libgcc/config/loongarch/lib2funcs.c
b/libgcc/config/loongarch/lib2funcs.c
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/libgcc/config/loongarch/linux-unwind.h
b/libgcc/config/loongarch/linux-unwind.h
new file mode 100644
index 00000000000..8c9dfa56a6d
--- /dev/null
+++ b/libgcc/config/loongarch/linux-unwind.h
@@ -0,0 +1,80 @@
+/* DWARF2 EH unwinding support for LoongArch Linux.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC 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 General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
+
+#ifndef inhibit_libc
+/* Do code reading to identify a signal frame, and set the frame
+ state data appropriately. See unwind-dw2.c for the structs. */
+
+#include <signal.h>
+#include <sys/syscall.h>
+#include <sys/ucontext.h>
+
+#define MD_FALLBACK_FRAME_STATE_FOR loongarch_fallback_frame_state
+
+static _Unwind_Reason_Code
+loongarch_fallback_frame_state (struct _Unwind_Context *context,
+ _Unwind_FrameState *fs)
+{
+ u_int32_t *pc = (u_int32_t *) context->ra;
+ struct sigcontext *sc;
+ _Unwind_Ptr new_cfa;
+ int i;
+
+ /* 03822c0b dli a7, 0x8b (sigreturn) */
+ /* 002b0000 syscall 0 */
+ if (pc[1] != 0x002b0000)
+ return _URC_END_OF_STACK;
+ if (pc[0] == 0x03822c0b)
+ {
+ struct rt_sigframe
+ {
+ siginfo_t info;
+ ucontext_t uc;
+ } *rt_ = context->cfa;
+ sc = &rt_->uc.uc_mcontext;
+ }
+ else
+ return _URC_END_OF_STACK;
+
+ new_cfa = (_Unwind_Ptr) sc;
+ fs->regs.cfa_how = CFA_REG_OFFSET;
+ fs->regs.cfa_reg = __LIBGCC_STACK_POINTER_REGNUM__;
+ fs->regs.cfa_offset = new_cfa - (_Unwind_Ptr) context->cfa;
+
+ for (i = 0; i < 32; i++)
+ {
+ fs->regs.reg[i].how = REG_SAVED_OFFSET;
+ fs->regs.reg[i].loc.offset = (_Unwind_Ptr) & (sc->sc_regs[i]) - new_cfa;
+ }
+
+ fs->signal_frame = 1;
+ fs->regs.reg[__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__].how
+ = REG_SAVED_VAL_OFFSET;
+ fs->regs.reg[__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__].loc.offset
+ = (_Unwind_Ptr) (sc->sc_pc) - new_cfa;
+ fs->retaddr_column = __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__;
+
+ return _URC_NO_REASON;
+}
+#endif
diff --git a/libgcc/config/loongarch/sfp-machine.h
b/libgcc/config/loongarch/sfp-machine.h
new file mode 100644
index 00000000000..cb5b04feede
--- /dev/null
+++ b/libgcc/config/loongarch/sfp-machine.h
@@ -0,0 +1,152 @@
+/* softfp machine description for LoongArch.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC 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 General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
+
+#ifdef __loongarch64
+#define _FP_W_TYPE_SIZE 64
+#define _FP_W_TYPE unsigned long long
+#define _FP_WS_TYPE signed long long
+#define _FP_I_TYPE long long
+
+typedef int TItype __attribute__ ((mode (TI)));
+typedef unsigned int UTItype __attribute__ ((mode (TI)));
+#define TI_BITS (__CHAR_BIT__ * (int) sizeof (TItype))
+
+#define _FP_MUL_MEAT_S(R, X, Y) \
+ _FP_MUL_MEAT_1_wide (_FP_WFRACBITS_S, R, X, Y, umul_ppmm)
+#define _FP_MUL_MEAT_D(R, X, Y) \
+ _FP_MUL_MEAT_1_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
+#define _FP_MUL_MEAT_Q(R, X, Y) \
+ _FP_MUL_MEAT_2_wide (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)
+
+#define _FP_DIV_MEAT_S(R, X, Y) _FP_DIV_MEAT_1_udiv_norm (S, R, X, Y)
+#define _FP_DIV_MEAT_D(R, X, Y) _FP_DIV_MEAT_1_udiv_norm (D, R, X, Y)
+#define _FP_DIV_MEAT_Q(R, X, Y) _FP_DIV_MEAT_2_udiv (Q, R, X, Y)
+
+#define _FP_NANFRAC_S ((_FP_QNANBIT_S << 1) - 1)
+#define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1)
+#define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1
+#else
+#define _FP_W_TYPE_SIZE 32
+#define _FP_W_TYPE unsigned int
+#define _FP_WS_TYPE signed int
+#define _FP_I_TYPE int
+
+#define _FP_MUL_MEAT_S(R, X, Y) \
+ _FP_MUL_MEAT_1_wide (_FP_WFRACBITS_S, R, X, Y, umul_ppmm)
+#define _FP_MUL_MEAT_D(R, X, Y) \
+ _FP_MUL_MEAT_2_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
+#define _FP_MUL_MEAT_Q(R, X, Y) \
+ _FP_MUL_MEAT_4_wide (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)
+
+#define _FP_DIV_MEAT_S(R, X, Y) _FP_DIV_MEAT_1_udiv_norm (S, R, X, Y)
+#define _FP_DIV_MEAT_D(R, X, Y) _FP_DIV_MEAT_2_udiv (D, R, X, Y)
+#define _FP_DIV_MEAT_Q(R, X, Y) _FP_DIV_MEAT_4_udiv (Q, R, X, Y)
+
+#define _FP_NANFRAC_S ((_FP_QNANBIT_S << 1) - 1)
+#define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1), -1
+#define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
+#endif
+
+/* The type of the result of a floating point comparison. This must
+ match __libgcc_cmp_return__ in GCC for the target. */
+typedef int __gcc_CMPtype __attribute__ ((mode (__libgcc_cmp_return__)));
+#define CMPtype __gcc_CMPtype
+
+#define _FP_NANSIGN_S 0
+#define _FP_NANSIGN_D 0
+#define _FP_NANSIGN_Q 0
+
+#define _FP_KEEPNANFRACP 1
+#define _FP_QNANNEGATEDP 0
+
+/* NaN payloads should be preserved for NAN2008. */
+#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP) \
+ do \
+ { \
+ R##_s = X##_s; \
+ _FP_FRAC_COPY_##wc (R, X); \
+ R##_c = FP_CLS_NAN; \
+ } \
+ while (0)
+
+#ifdef __loongarch_hard_float
+#define FP_EX_INVALID 0x100000
+#define FP_EX_DIVZERO 0x080000
+#define FP_EX_OVERFLOW 0x040000
+#define FP_EX_UNDERFLOW 0x020000
+#define FP_EX_INEXACT 0x010000
+#define FP_EX_ALL \
+ (FP_EX_INVALID | FP_EX_DIVZERO | FP_EX_OVERFLOW | FP_EX_UNDERFLOW \
+ | FP_EX_INEXACT)
+
+#define FP_EX_ENABLE_SHIFT 16
+#define FP_EX_CAUSE_SHIFT 8
+
+#define FP_RND_NEAREST 0x000
+#define FP_RND_ZERO 0x100
+#define FP_RND_PINF 0x200
+#define FP_RND_MINF 0x300
+#define FP_RND_MASK 0x300
+
+#define _FP_DECL_EX \
+ unsigned long int _fcsr __attribute__ ((unused)) = FP_RND_NEAREST
+
+#define FP_INIT_ROUNDMODE \
+ do \
+ { \
+ _fcsr = __builtin_loongarch_movfcsr2gr (0); \
+ } \
+ while (0)
+
+#define FP_ROUNDMODE (_fcsr & FP_RND_MASK)
+
+#define FP_TRAPPING_EXCEPTIONS ((_fcsr << FP_EX_ENABLE_SHIFT) & FP_EX_ALL)
+
+#define FP_HANDLE_EXCEPTIONS \
+ do \
+ { \
+ _fcsr &= ~(FP_EX_ALL << FP_EX_CAUSE_SHIFT); \
+ _fcsr |= _fex | (_fex << FP_EX_CAUSE_SHIFT); \
+ __builtin_loongarch_movgr2fcsr (0, _fcsr); \
+ } \
+ while (0)
+
+#else
+#define FP_EX_INVALID (1 << 4)
+#define FP_EX_DIVZERO (1 << 3)
+#define FP_EX_OVERFLOW (1 << 2)
+#define FP_EX_UNDERFLOW (1 << 1)
+#define FP_EX_INEXACT (1 << 0)
+#endif
+
+#define _FP_TININESS_AFTER_ROUNDING 1
+
+#define __LITTLE_ENDIAN 1234
+
+#define __BYTE_ORDER __LITTLE_ENDIAN
+
+/* Define ALIASNAME as a strong alias for NAME. */
+#define strong_alias(name, aliasname) _strong_alias (name, aliasname)
+#define _strong_alias(name, aliasname) \
+ extern __typeof (name) aliasname __attribute__ ((alias (#name)));
diff --git a/libgcc/config/loongarch/t-crtstuff
b/libgcc/config/loongarch/t-crtstuff
new file mode 100644
index 00000000000..b8c36eb66b7
--- /dev/null
+++ b/libgcc/config/loongarch/t-crtstuff
@@ -0,0 +1,5 @@
+# -fasynchronous-unwind-tables is on by default for LoongArch.
+# We turn it off for crt*.o because it would make __EH_FRAME_BEGIN__ point
+# to .eh_frame data from crtbeginT.o instead of the user-defined object
+# during static linking.
+CRTSTUFF_T_CFLAGS += -fno-omit-frame-pointer -fno-asynchronous-unwind-tables
diff --git a/libgcc/config/loongarch/t-elf b/libgcc/config/loongarch/t-elf
new file mode 100644
index 00000000000..651f10a5303
--- /dev/null
+++ b/libgcc/config/loongarch/t-elf
@@ -0,0 +1,3 @@
+# We must build libgcc2.a with -G 0, in case the user wants to link
+# without the $gp register.
+HOST_LIBGCC2_CFLAGS += -G 0
diff --git a/libgcc/config/loongarch/t-loongarch
b/libgcc/config/loongarch/t-loongarch
new file mode 100644
index 00000000000..9508cb2fcae
--- /dev/null
+++ b/libgcc/config/loongarch/t-loongarch
@@ -0,0 +1,9 @@
+LIB2_SIDITI_CONV_FUNCS = yes
+
+softfp_float_modes :=
+softfp_int_modes := si di
+softfp_extensions :=
+softfp_truncations :=
+softfp_exclude_libgcc2 := n
+
+LIB2ADD_ST += $(srcdir)/config/loongarch/lib2funcs.c
diff --git a/libgcc/config/loongarch/t-loongarch64
b/libgcc/config/loongarch/t-loongarch64
new file mode 100644
index 00000000000..a1e3513e288
--- /dev/null
+++ b/libgcc/config/loongarch/t-loongarch64
@@ -0,0 +1 @@
+softfp_int_modes += ti
diff --git a/libgcc/config/loongarch/t-softfp-tf
b/libgcc/config/loongarch/t-softfp-tf
new file mode 100644
index 00000000000..306677b1255
--- /dev/null
+++ b/libgcc/config/loongarch/t-softfp-tf
@@ -0,0 +1,3 @@
+softfp_float_modes += tf
+softfp_extensions += sftf dftf
+softfp_truncations += tfsf tfdf
diff --git a/libgcc/configure.ac b/libgcc/configure.ac
index 13a80b2551b..b17d788dbd0 100644
--- a/libgcc/configure.ac
+++ b/libgcc/configure.ac
@@ -317,7 +317,7 @@ AC_CACHE_CHECK([whether assembler supports CFI directives],
[libgcc_cv_cfi],
# word size rather than the address size.
cat > conftest.c <<EOF
#if defined(__x86_64__) || (!defined(__i386__) && defined(__LP64__)) \
- || defined(__mips64)
+ || defined(__mips64) || defined(__loongarch64)
host_address=64
#else
host_address=32
--
2.27.0
