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author | Warner Losh <imp@bsdimp.com> | 2021-09-23 15:19:33 -0600 |
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committer | Warner Losh <imp@bsdimp.com> | 2022-01-07 22:58:51 -0700 |
commit | 781be8666c7cc05a9cce6011c9d9c1ba4e15770d (patch) | |
tree | 3fc747eb4773669daed0d98ba706f25e6d3606d2 /bsd-user/arm | |
parent | 2cb1e6432f917a91c3edd4772b26da3b5d8df791 (diff) | |
download | qemu-781be8666c7cc05a9cce6011c9d9c1ba4e15770d.zip qemu-781be8666c7cc05a9cce6011c9d9c1ba4e15770d.tar.gz qemu-781be8666c7cc05a9cce6011c9d9c1ba4e15770d.tar.bz2 |
bsd-user/arm/signal.c: arm set_sigtramp_args
Implement set_sigtramp_args to setup the arguments to the sigtramp
calls.
Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'bsd-user/arm')
-rw-r--r-- | bsd-user/arm/signal.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/bsd-user/arm/signal.c b/bsd-user/arm/signal.c new file mode 100644 index 0000000..3c0db30 --- /dev/null +++ b/bsd-user/arm/signal.c @@ -0,0 +1,60 @@ +/* + * arm signal functions + * + * Copyright (c) 2013 Stacey D. Son + * + * 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.h" + +/* + * Compare to arm/arm/machdep.c sendsig() + * Assumes that target stack frame memory is locked. + */ +abi_long set_sigtramp_args(CPUARMState *env, int sig, + struct target_sigframe *frame, + abi_ulong frame_addr, + struct target_sigaction *ka) +{ + /* + * Arguments to signal handler: + * r0 = signal number + * r1 = siginfo pointer + * r2 = ucontext pointer + * r5 = ucontext pointer + * pc = signal handler pointer + * sp = sigframe struct pointer + * lr = sigtramp at base of user stack + */ + + env->regs[0] = sig; + env->regs[1] = frame_addr + + offsetof(struct target_sigframe, sf_si); + env->regs[2] = frame_addr + + offsetof(struct target_sigframe, sf_uc); + + /* the trampoline uses r5 as the uc address */ + env->regs[5] = frame_addr + + offsetof(struct target_sigframe, sf_uc); + env->regs[TARGET_REG_PC] = ka->_sa_handler & ~1; + env->regs[TARGET_REG_SP] = frame_addr; + env->regs[TARGET_REG_LR] = TARGET_PS_STRINGS - TARGET_SZSIGCODE; + /* + * Low bit indicates whether or not we're entering thumb mode. + */ + cpsr_write(env, (ka->_sa_handler & 1) * CPSR_T, CPSR_T, CPSRWriteByInstr); + + return 0; +} |