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Sat, 19 Aug 2023 02:49:45 -0700 (PDT) From: Karim Taha To: qemu-devel@nongnu.org Cc: imp@bsdimp.com, Stacey Son , Karim Taha Subject: [PATCH 21/22] Implement shmat(2) and shmdt(2) Date: Sat, 19 Aug 2023 11:48:05 +0200 Message-Id: <20230819094806.14965-22-kariem.taha2.7@gmail.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230819094806.14965-1-kariem.taha2.7@gmail.com> References: <20230819094806.14965-1-kariem.taha2.7@gmail.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::436; envelope-from=kariem.taha2.7@gmail.com; helo=mail-wr1-x436.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Stacey Son Signed-off-by: Stacey Son Signed-off-by: Karim Taha --- bsd-user/bsd-mem.h | 72 +++++++++++++++++++++++++++++++++++ bsd-user/freebsd/os-syscall.c | 8 ++++ 2 files changed, 80 insertions(+) diff --git a/bsd-user/bsd-mem.h b/bsd-user/bsd-mem.h index 221ad76d8c..f737b94885 100644 --- a/bsd-user/bsd-mem.h +++ b/bsd-user/bsd-mem.h @@ -335,4 +335,76 @@ static inline abi_long do_bsd_shmctl(abi_long shmid, abi_long cmd, return ret; } +/* shmat(2) */ +static inline abi_long do_bsd_shmat(int shmid, abi_ulong shmaddr, int shmflg) +{ + abi_ulong raddr; + abi_long ret; + void *host_raddr; + struct shmid_ds shm_info; + int i; + + /* Find out the length of the shared memory segment. */ + ret = get_errno(shmctl(shmid, IPC_STAT, &shm_info)); + if (is_error(ret)) { + /* Can't get the length */ + return ret; + } + + mmap_lock(); + + if (shmaddr) { + host_raddr = shmat(shmid, (void *)g2h_untagged(shmaddr), shmflg); + } else { + abi_ulong mmap_start; + + mmap_start = mmap_find_vma(0, shm_info.shm_segsz); + + if (mmap_start == -1) { + errno = ENOMEM; + host_raddr = (void *)-1; + } else { + host_raddr = shmat(shmid, g2h_untagged(mmap_start), + shmflg); /* | SHM_REMAP XXX WHY? */ + } + } + + if (host_raddr == (void *)-1) { + mmap_unlock(); + return get_errno((long)host_raddr); + } + raddr = h2g((unsigned long)host_raddr); + + page_set_flags(raddr, raddr + shm_info.shm_segsz, + PAGE_VALID | PAGE_READ | ((shmflg & SHM_RDONLY) ? 0 : PAGE_WRITE)); + + for (i = 0; i < N_BSD_SHM_REGIONS; i++) { + if (bsd_shm_regions[i].start == 0) { + bsd_shm_regions[i].start = raddr; + bsd_shm_regions[i].size = shm_info.shm_segsz; + break; + } + } + + mmap_unlock(); + return raddr; +} + +/* shmdt(2) */ +static inline abi_long do_bsd_shmdt(abi_ulong shmaddr) +{ + int i; + + for (i = 0; i < N_BSD_SHM_REGIONS; ++i) { + if (bsd_shm_regions[i].start == shmaddr) { + bsd_shm_regions[i].start = 0; + page_set_flags(shmaddr, + shmaddr + bsd_shm_regions[i].size, 0); + break; + } + } + + return get_errno(shmdt(g2h_untagged(shmaddr))); +} + #endif /* BSD_USER_BSD_MEM_H */ diff --git a/bsd-user/freebsd/os-syscall.c b/bsd-user/freebsd/os-syscall.c index 9681c65ce9..f76bc1eb38 100644 --- a/bsd-user/freebsd/os-syscall.c +++ b/bsd-user/freebsd/os-syscall.c @@ -559,6 +559,14 @@ static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1, ret = do_bsd_shmctl(arg1, arg2, arg3); break; + case TARGET_FREEBSD_NR_shmat: /* shmat(2) */ + ret = do_bsd_shmat(arg1, arg2, arg3); + break; + + case TARGET_FREEBSD_NR_shmdt: /* shmdt(2) */ + ret = do_bsd_shmdt(arg1); + break; + /* * Misc */