From 31c048342db09e70ab887aba9c7e0818c18d0fb1 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Fri, 12 Feb 2021 10:48:50 -0800 Subject: [PATCH] linux-user: Handle tags in lock_user/unlock_user Resolve the untagged address once, using thread_cpu. Tidy the DEBUG_REMAP code using glib routines. Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson Message-id: 20210212184902.1251044-20-richard.henderson@linaro.org Signed-off-by: Peter Maydell --- linux-user/uaccess.c | 27 ++++++++++++++------------- 1 file changed, 14 insertions(+), 13 deletions(-) diff --git a/linux-user/uaccess.c b/linux-user/uaccess.c index 76af6a92b1..c696913016 100644 --- a/linux-user/uaccess.c +++ b/linux-user/uaccess.c @@ -6,36 +6,37 @@ void *lock_user(int type, abi_ulong guest_addr, size_t len, bool copy) { + void *host_addr; + + guest_addr = cpu_untagged_addr(thread_cpu, guest_addr); if (!access_ok_untagged(type, guest_addr, len)) { return NULL; } + host_addr = g2h_untagged(guest_addr); #ifdef DEBUG_REMAP - { - void *addr; - addr = g_malloc(len); - if (copy) { - memcpy(addr, g2h(guest_addr), len); - } else { - memset(addr, 0, len); - } - return addr; + if (copy) { + host_addr = g_memdup(host_addr, len); + } else { + host_addr = g_malloc0(len); } -#else - return g2h_untagged(guest_addr); #endif + return host_addr; } #ifdef DEBUG_REMAP void unlock_user(void *host_ptr, abi_ulong guest_addr, size_t len); { + void *host_ptr_conv; + if (!host_ptr) { return; } - if (host_ptr == g2h_untagged(guest_addr)) { + host_ptr_conv = g2h(thread_cpu, guest_addr); + if (host_ptr == host_ptr_conv) { return; } if (len != 0) { - memcpy(g2h_untagged(guest_addr), host_ptr, len); + memcpy(host_ptr_conv, host_ptr, len); } g_free(host_ptr); }