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This is the original binutils bugzilla report,
https://sourceware.org/bugzilla/show_bug.cgi?id=28509
And this is the first version of the proposed binutils patch,
https://sourceware.org/pipermail/binutils/2021-November/118398.html
After applying the binutils patch, I get the the unexpected error when
building libgcc,
/scratch/nelsonc/riscv-gnu-toolchain/riscv-gcc/libgcc/config/riscv/div.S:42:
/scratch/nelsonc/build-upstream/rv64gc-linux/build-install/riscv64-unknown-linux-gnu/bin/ld: relocation R_RISCV_JAL against `__udivdi3' which may bind externally can not be used when making a shared object; recompile with -fPIC
Therefore, this patch add an extra hidden alias symbol for __udivdi3, and
then use HIDDEN_JUMPTARGET to target a non-preemptible symbol instead.
The solution is similar to glibc as follows,
https://sourceware.org/git/?p=glibc.git;a=commit;h=68389203832ab39dd0dbaabbc4059e7fff51c29b
libgcc/ChangeLog:
* config/riscv/div.S: Add the hidden alias symbol for __udivdi3, and
then use HIDDEN_JUMPTARGET to target it since it is non-preemptible.
* config/riscv/riscv-asm.h: Added new macros HIDDEN_JUMPTARGET and
HIDDEN_DEF.
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libgcc/
* config/riscv/sfp-machine.h (__BYTE_ORDER): Set according
to __BYTE_ORDER__.
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Use `-fasynchronous-unwind-tables' rather than `-fexceptions
-fnon-call-exceptions' in LIB2_DIVMOD_FUNCS compilation flags so as to
provide unwind tables for the affected functions while not pulling the
unwinder proper, which is not required here.
Beyond saving program space it fixes a RISC-V glibc build error due to
unsatisfied `malloc' and `free' references from the unwinder causing
link errors with `ld.so' where libgcc has been built at -O0.
libgcc/
* config/riscv/t-elf (LIB2_DIVMOD_EXCEPTION_FLAGS): New
variable.
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Rewrite code sequences throughout the 64-bit RISC-V `__riscv_save_*'
routines replacing `li t1, -48', `li t1, -64', and `li t1, -80',
instructions, which do not have a compressed encoding, respectively with
`li t1, 3', `li t1, 4', and `li t1, 4', which do, and then adjusting the
remaining code accordingly observing that `sub sp, sp, t1' takes the
same amount of space as an `slli t1, t1, 4'/`add sp, sp, t1' instruction
pair does, again due to the use of compressed encodings, saving 6 bytes
total.
This change does increase code size by 4 bytes for RISC-V processors
lacking the compressed instruction set, however their users couldn't
care about the code size or they would have chosen an implementation
that does have the compressed instructions, wouldn't they?
libgcc/
* config/riscv/save-restore.S [__riscv_xlen == 64]
(__riscv_save_10, __riscv_save_8, __riscv_save_6, __riscv_save_4)
(__riscv_save_2): Replace negative immediates used for the final
stack pointer adjustment with positive ones, right-shifted by 4.
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The ISA manual specifies that divide by zero always returns -1 as the result.
We were failing to do that when the dividend was negative.
Original patch from Virginie Moser.
libgcc/
* config/riscv/div.S (__divdi3): For negative arguments, change bgez
to bgtz.
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From-SVN: r279813
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Using -mno-fdiv gives linker errors unless we build the missing divide
routines in libgcc always. There is at least one university project
designing RISC-V parts without FP divide that wants to use the option.
libgcc/
* config/riscv/t-softfp32 (softfp_extra): Add FP divide routines
From-SVN: r277723
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From-SVN: r267494
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Kito Cheng <kito.cheng@gmail.com>
Monk Chiang <sh.chiang04@gmail.com>
gcc/
* common/config/riscv/riscv-common.c (riscv_parse_arch_string):
Add support to parse rv32e*. Clear MASK_RVE for rv32i and rv64i.
* config.gcc (riscv*-*-*): Add support for rv32e* and ilp32e.
* config/riscv/riscv-c.c (riscv_cpu_cpp_builtins): Define
__riscv_32e when TARGET_RVE. Handle ABI_ILP32E as soft-float ABI.
* config/riscv/riscv-opts.h (riscv_abi_type): Add ABI_ILP32E.
* config/riscv/riscv.c (riscv_compute_frame_info): When TARGET_RVE,
compute save_libcall_adjustment properly.
(riscv_option_override): Call error if TARGET_RVE and not ABI_ILP32E.
(riscv_conditional_register_usage): Handle TARGET_RVE and ABI_ILP32E.
* config/riscv/riscv.h (UNITS_PER_FP_ARG): Handle ABI_ILP32E.
(STACK_BOUNDARY, ABI_STACK_BOUNDARY): Handle TARGET_RVE.
(GP_REG_LAST, MAX_ARGS_IN_REGISTERS): Likewise.
(ABI_SPEC): Handle mabi=ilp32e.
* config/riscv/riscv.opt (abi_type): Add ABI_ILP32E.
(RVE): Add RVE mask.
* doc/invoke.texi (RISC-V options) <-mabi>: Add ilp32e info.
<-march>: Add rv32e as an example.
gcc/testsuite/
* gcc.dg/stack-usage-1.c: Add support for rv32e.
libgcc/
* config/riscv/save-restore.S: Add support for rv32e.
Co-Authored-By: Jim Wilson <jimw@sifive.com>
Co-Authored-By: Monk Chiang <sh.chiang04@gmail.com>
From-SVN: r260384
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From-SVN: r256169
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libgcc/
* config/riscv/t-elf: Use multi3.c instead of multi3.S.
* config/riscv/multi3.c: New file.
* config/riscv/multi3.S: Remove.
From-SVN: r255598
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libgcc/
* config/riscv/div.S: Use FUNC_* macros.
* config/riscv/muldi3.S, config/riscv/multi3.S: Likewise
* config/riscv/save-restore.S: Likewise.
* config/riscv/riscv-asm.h: New.
From-SVN: r255521
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Current glibc no longer gives the ucontext_t type the tag struct
ucontext, to conform with POSIX namespace rules. This requires
various linux-unwind.h files in libgcc, that were previously using
struct ucontext, to be fixed to use ucontext_t instead. This is
similar to the removal of the struct siginfo tag from siginfo_t some
years ago.
This patch changes those files to use ucontext_t instead. As the
standard name that should be unconditionally safe, so this is not
restricted to architectures supported by glibc, or conditioned on the
glibc version.
Tested compilation together with current glibc with glibc's
build-many-glibcs.py.
* config/aarch64/linux-unwind.h (aarch64_fallback_frame_state),
config/alpha/linux-unwind.h (alpha_fallback_frame_state),
config/bfin/linux-unwind.h (bfin_fallback_frame_state),
config/i386/linux-unwind.h (x86_64_fallback_frame_state,
x86_fallback_frame_state), config/m68k/linux-unwind.h (struct
uw_ucontext), config/nios2/linux-unwind.h (struct nios2_ucontext),
config/pa/linux-unwind.h (pa32_fallback_frame_state),
config/riscv/linux-unwind.h (riscv_fallback_frame_state),
config/sh/linux-unwind.h (sh_fallback_frame_state),
config/tilepro/linux-unwind.h (tile_fallback_frame_state),
config/xtensa/linux-unwind.h (xtensa_fallback_frame_state): Use
ucontext_t instead of struct ucontext.
From-SVN: r249731
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libgcc/ChangeLog:
2017-02-06 Palmer Dabbelt <palmer@dabbelt.com>
* config.host: Add RISC-V tuples.
* config/riscv/atomic.c: New file.
* config/riscv/crti.S: Likewise.
* config/riscv/crtn.S: Likewise.
* config/riscv/div.S: Likewise.
* config/riscv/linux-unwind.h: Likewise.
* config/riscv/muldi3.S: Likewise.
* config/riscv/multi3.S: Likewise.
* config/riscv/save-restore.S: Likewise.
* config/riscv/sfp-machine.h: Likewise.
* config/riscv/t-elf: Likewise.
* config/riscv/t-elf32: Likewise.
* config/riscv/t-elf64: Likewise.
* config/riscv/t-softfp32: Likewise.
* config/riscv/t-softfp64: Likewise.
From-SVN: r245226
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