On 8/17/24 03:09, Ajeet Singh wrote:
> From: Mark Corbin <mark@dibsco.co.uk>
>
> Implemented the `setup_sigtramp` function for setting up the signal
> trampoline code in the RISC-V architecture.
>
> Signed-off-by: Mark Corbin <mark@dibsco.co.uk>
> Signed-off-by: Ajeet Singh <itachis@FreeBSD.org>
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
> ---
> bsd-user/riscv/target_arch_sigtramp.h | 46 +++++++++++++++++++++++++++
> 1 file changed, 46 insertions(+)
> create mode 100644 bsd-user/riscv/target_arch_sigtramp.h
>
> diff --git a/bsd-user/riscv/target_arch_sigtramp.h b/bsd-user/riscv/target_arch_sigtramp.h
> new file mode 100644
> index 0000000000..39c878db22
> --- /dev/null
> +++ b/bsd-user/riscv/target_arch_sigtramp.h
> @@ -0,0 +1,46 @@
> +/*
> + * RISC-V sigcode
> + *
> + * Copyright (c) 2019 Mark Corbin
> + *
> + * This 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 of the License, or (at your option) any later version.
> + *
> + * This 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 this library; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef TARGET_ARCH_SIGTRAMP_H
> +#define TARGET_ARCH_SIGTRAMP_H
> +
> +/* Compare with sigcode() in riscv/riscv/locore.S */
> +static inline abi_long setup_sigtramp(abi_ulong offset, unsigned sigf_uc,
> + unsigned sys_sigreturn)
> +{
> + int i;
> + uint32_t sys_exit = TARGET_FREEBSD_NR_exit;
> +
> + uint32_t sigtramp_code[] = {
> + /* 1 */ 0x00010513, /* mv a0, sp */
> + /* 2 */ 0x00050513 + (sigf_uc << 20), /* addi a0, a0, sigf_uc */
> + /* 3 */ 0x00000293 + (sys_sigreturn << 20), /* li t0, sys_sigreturn */
> + /* 4 */ 0x00000073, /* ecall */
> + /* 5 */ 0x00000293 + (sys_exit << 20), /* li t0, sys_exit */
> + /* 6 */ 0x00000073, /* ecall */
> + /* 7 */ 0xFF1FF06F /* b -16 */
> + };
> +
> + for (i = 0; i < 7; i++) {
> + tswap32s(&sigtramp_code[i]);
> + }
Use
static const uint32_t sigtramp_code[] = {
const_le32(...),
};
r~
> +
> + return memcpy_to_target(offset, sigtramp_code, TARGET_SZSIGCODE);
> +}
> +#endif /* TARGET_ARCH_SIGTRAMP_H */