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bsd-user: Add RISC-V signal trampoline setup function

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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>
Message-ID: <20240916155119.14610-8-itachis@FreeBSD.org>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Mark Corbin 2024-09-17 01:51:09 +10:00 committed by Alistair Francis
parent 2bf79222ce
commit 6402325012
1 changed files with 41 additions and 0 deletions
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41
bsd-user/riscv/target_arch_sigtramp.h Normal file
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/*
* 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)
{
uint32_t sys_exit = TARGET_FREEBSD_NR_exit;
uint32_t sigtramp_code[] = {
/*1*/ const_le32(0x00010513), /*mv a0, sp*/
/*2*/ const_le32(0x00050513 + (sigf_uc << 20)), /*addi a0,a0,sigf_uc*/
/*3*/ const_le32(0x00000293 + (sys_sigreturn << 20)),/*li t0,sys_sigreturn*/
/*4*/ const_le32(0x00000073), /*ecall*/
/*5*/ const_le32(0x00000293 + (sys_exit << 20)), /*li t0,sys_exit*/
/*6*/ const_le32(0x00000073), /*ecall*/
/*7*/ const_le32(0xFF1FF06F) /*b -16*/
};
return memcpy_to_target(offset, sigtramp_code, TARGET_SZSIGCODE);
}
#endif /* TARGET_ARCH_SIGTRAMP_H */