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FRET-qemu/bsd-user/riscv/signal.c
Mark Corbin 4c492b4063 bsd-user: Implement set_mcontext and get_ucontext_sigreturn for RISCV 
Added implementations for 'set_mcontext' and 'get_ucontext_sigreturn'
functions for RISC-V architecture,
Both functions ensure that the CPU state and user context are properly
managed.

Signed-off-by: Mark Corbin <mark@dibsco.co.uk>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Signed-off-by: Ajeet Singh <itachis@FreeBSD.org>
Co-authored-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240916155119.14610-17-itachis@FreeBSD.org>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2024-10-02 15:11:52 +10:00

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/*
* RISC-V signal definitions
*
* Copyright (c) 2019 Mark Corbin
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu.h"
/*
* Compare with sendsig() in riscv/riscv/exec_machdep.c
* Assumes that target stack frame memory is locked.
*/
abi_long
set_sigtramp_args(CPURISCVState *regs, int sig, struct target_sigframe *frame,
abi_ulong frame_addr, struct target_sigaction *ka)
{
/*
* Arguments to signal handler:
* a0 (10) = signal number
* a1 (11) = siginfo pointer
* a2 (12) = ucontext pointer
* pc = signal pointer handler
* sp (2) = sigframe pointer
* ra (1) = sigtramp at base of user stack
*/
regs->gpr[xA0] = sig;
regs->gpr[xA1] = frame_addr +
offsetof(struct target_sigframe, sf_si);
regs->gpr[xA2] = frame_addr +
offsetof(struct target_sigframe, sf_uc);
regs->pc = ka->_sa_handler;
regs->gpr[xSP] = frame_addr;
regs->gpr[xRA] = TARGET_PS_STRINGS - TARGET_SZSIGCODE;
return 0;
}
/*
* Compare to riscv/riscv/exec_machdep.c sendsig()
* Assumes that the memory is locked if frame points to user memory.
*/
abi_long setup_sigframe_arch(CPURISCVState *env, abi_ulong frame_addr,
struct target_sigframe *frame, int flags)
{
target_mcontext_t *mcp = &frame->sf_uc.uc_mcontext;
get_mcontext(env, mcp, flags);
return 0;
}
/*
* Compare with get_mcontext() in riscv/riscv/machdep.c
* Assumes that the memory is locked if mcp points to user memory.
*/
abi_long get_mcontext(CPURISCVState *regs, target_mcontext_t *mcp,
int flags)
{
mcp->mc_gpregs.gp_t[0] = tswap64(regs->gpr[5]);
mcp->mc_gpregs.gp_t[1] = tswap64(regs->gpr[6]);
mcp->mc_gpregs.gp_t[2] = tswap64(regs->gpr[7]);
mcp->mc_gpregs.gp_t[3] = tswap64(regs->gpr[28]);
mcp->mc_gpregs.gp_t[4] = tswap64(regs->gpr[29]);
mcp->mc_gpregs.gp_t[5] = tswap64(regs->gpr[30]);
mcp->mc_gpregs.gp_t[6] = tswap64(regs->gpr[31]);
mcp->mc_gpregs.gp_s[0] = tswap64(regs->gpr[8]);
mcp->mc_gpregs.gp_s[1] = tswap64(regs->gpr[9]);
mcp->mc_gpregs.gp_s[2] = tswap64(regs->gpr[18]);
mcp->mc_gpregs.gp_s[3] = tswap64(regs->gpr[19]);
mcp->mc_gpregs.gp_s[4] = tswap64(regs->gpr[20]);
mcp->mc_gpregs.gp_s[5] = tswap64(regs->gpr[21]);
mcp->mc_gpregs.gp_s[6] = tswap64(regs->gpr[22]);
mcp->mc_gpregs.gp_s[7] = tswap64(regs->gpr[23]);
mcp->mc_gpregs.gp_s[8] = tswap64(regs->gpr[24]);
mcp->mc_gpregs.gp_s[9] = tswap64(regs->gpr[25]);
mcp->mc_gpregs.gp_s[10] = tswap64(regs->gpr[26]);
mcp->mc_gpregs.gp_s[11] = tswap64(regs->gpr[27]);
mcp->mc_gpregs.gp_a[0] = tswap64(regs->gpr[10]);
mcp->mc_gpregs.gp_a[1] = tswap64(regs->gpr[11]);
mcp->mc_gpregs.gp_a[2] = tswap64(regs->gpr[12]);
mcp->mc_gpregs.gp_a[3] = tswap64(regs->gpr[13]);
mcp->mc_gpregs.gp_a[4] = tswap64(regs->gpr[14]);
mcp->mc_gpregs.gp_a[5] = tswap64(regs->gpr[15]);
mcp->mc_gpregs.gp_a[6] = tswap64(regs->gpr[16]);
mcp->mc_gpregs.gp_a[7] = tswap64(regs->gpr[17]);
if (flags & TARGET_MC_GET_CLEAR_RET) {
mcp->mc_gpregs.gp_a[0] = 0; /* a0 */
mcp->mc_gpregs.gp_a[1] = 0; /* a1 */
mcp->mc_gpregs.gp_t[0] = 0; /* clear syscall error */
}
mcp->mc_gpregs.gp_ra = tswap64(regs->gpr[1]);
mcp->mc_gpregs.gp_sp = tswap64(regs->gpr[2]);
mcp->mc_gpregs.gp_gp = tswap64(regs->gpr[3]);
mcp->mc_gpregs.gp_tp = tswap64(regs->gpr[4]);
mcp->mc_gpregs.gp_sepc = tswap64(regs->pc);
return 0;
}
/* Compare with set_mcontext() in riscv/riscv/exec_machdep.c */
abi_long set_mcontext(CPURISCVState *regs, target_mcontext_t *mcp,
int srflag)
{
regs->gpr[5] = tswap64(mcp->mc_gpregs.gp_t[0]);
regs->gpr[6] = tswap64(mcp->mc_gpregs.gp_t[1]);
regs->gpr[7] = tswap64(mcp->mc_gpregs.gp_t[2]);
regs->gpr[28] = tswap64(mcp->mc_gpregs.gp_t[3]);
regs->gpr[29] = tswap64(mcp->mc_gpregs.gp_t[4]);
regs->gpr[30] = tswap64(mcp->mc_gpregs.gp_t[5]);
regs->gpr[31] = tswap64(mcp->mc_gpregs.gp_t[6]);
regs->gpr[8] = tswap64(mcp->mc_gpregs.gp_s[0]);
regs->gpr[9] = tswap64(mcp->mc_gpregs.gp_s[1]);
regs->gpr[18] = tswap64(mcp->mc_gpregs.gp_s[2]);
regs->gpr[19] = tswap64(mcp->mc_gpregs.gp_s[3]);
regs->gpr[20] = tswap64(mcp->mc_gpregs.gp_s[4]);
regs->gpr[21] = tswap64(mcp->mc_gpregs.gp_s[5]);
regs->gpr[22] = tswap64(mcp->mc_gpregs.gp_s[6]);
regs->gpr[23] = tswap64(mcp->mc_gpregs.gp_s[7]);
regs->gpr[24] = tswap64(mcp->mc_gpregs.gp_s[8]);
regs->gpr[25] = tswap64(mcp->mc_gpregs.gp_s[9]);
regs->gpr[26] = tswap64(mcp->mc_gpregs.gp_s[10]);
regs->gpr[27] = tswap64(mcp->mc_gpregs.gp_s[11]);
regs->gpr[10] = tswap64(mcp->mc_gpregs.gp_a[0]);
regs->gpr[11] = tswap64(mcp->mc_gpregs.gp_a[1]);
regs->gpr[12] = tswap64(mcp->mc_gpregs.gp_a[2]);
regs->gpr[13] = tswap64(mcp->mc_gpregs.gp_a[3]);
regs->gpr[14] = tswap64(mcp->mc_gpregs.gp_a[4]);
regs->gpr[15] = tswap64(mcp->mc_gpregs.gp_a[5]);
regs->gpr[16] = tswap64(mcp->mc_gpregs.gp_a[6]);
regs->gpr[17] = tswap64(mcp->mc_gpregs.gp_a[7]);
regs->gpr[1] = tswap64(mcp->mc_gpregs.gp_ra);
regs->gpr[2] = tswap64(mcp->mc_gpregs.gp_sp);
regs->gpr[3] = tswap64(mcp->mc_gpregs.gp_gp);
regs->gpr[4] = tswap64(mcp->mc_gpregs.gp_tp);
regs->pc = tswap64(mcp->mc_gpregs.gp_sepc);
return 0;
}
/* Compare with sys_sigreturn() in riscv/riscv/machdep.c */
abi_long get_ucontext_sigreturn(CPURISCVState *regs,
abi_ulong target_sf, abi_ulong *target_uc)
{
*target_uc = target_sf;
return 0;
}
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