From fa97e38eed3bbdbc322d94092ca49450e724fff1 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Wed, 18 Jul 2018 13:06:48 -0700 Subject: linux-user/ppc: Implement swapcontext syscall This allows the tests generated by debian-powerpc-user-cross to function properly, especially tests/test-coroutine. Technically this syscall is available to both ppc32 and ppc64, but only ppc32 glibc actually uses it. Thus the ppc64 path is untested. Signed-off-by: Richard Henderson Tested-by: Alex Bennée Reviewed-by: Alex Bennée Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Laurent Vivier Message-Id: <20180718200648.22529-1-richard.henderson@linaro.org> --- linux-user/ppc/signal.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) (limited to 'linux-user/ppc') diff --git a/linux-user/ppc/signal.c b/linux-user/ppc/signal.c index ef4c518f11..2ae120a2bc 100644 --- a/linux-user/ppc/signal.c +++ b/linux-user/ppc/signal.c @@ -675,3 +675,59 @@ sigsegv: force_sig(TARGET_SIGSEGV); return -TARGET_QEMU_ESIGRETURN; } + +/* This syscall implements {get,set,swap}context for userland. */ +abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx, + abi_ulong unew_ctx, abi_long ctx_size) +{ + struct target_ucontext *uctx; + struct target_mcontext *mctx; + + /* For ppc32, ctx_size is "reserved for future use". + * For ppc64, we do not yet support the VSX extension. + */ + if (ctx_size < sizeof(struct target_ucontext)) { + return -TARGET_EINVAL; + } + + if (uold_ctx) { + TaskState *ts = (TaskState *)thread_cpu->opaque; + + if (!lock_user_struct(VERIFY_WRITE, uctx, uold_ctx, 1)) { + return -TARGET_EFAULT; + } + +#ifdef TARGET_PPC64 + mctx = &uctx->tuc_sigcontext.mcontext; +#else + /* ??? The kernel aligns the pointer down here into padding, but + * in setup_rt_frame we don't. Be self-compatible for now. + */ + mctx = &uctx->tuc_mcontext; + __put_user(h2g(mctx), &uctx->tuc_regs); +#endif + + save_user_regs(env, mctx); + host_to_target_sigset(&uctx->tuc_sigmask, &ts->signal_mask); + + unlock_user_struct(uctx, uold_ctx, 1); + } + + if (unew_ctx) { + int err; + + if (!lock_user_struct(VERIFY_READ, uctx, unew_ctx, 1)) { + return -TARGET_EFAULT; + } + err = do_setcontext(uctx, env, 0); + unlock_user_struct(uctx, unew_ctx, 1); + + if (err) { + /* We cannot return to a partially updated context. */ + force_sig(TARGET_SIGSEGV); + } + return -TARGET_QEMU_ESIGRETURN; + } + + return 0; +} -- cgit v1.2.3-55-g7522