From 732f9e89a1c737f738c445ff24929a1bc137d1a9 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Sat, 6 Jul 2013 14:17:49 +0200 Subject: linux-user: fix segmentation fault passing with h2g(x) != x When forwarding a segmentation fault into the guest process, we were passing the host's address directly into the guest process's signal descriptor. That obviously confused the guest process, since it didn't know what to make of the (usually 32-bit truncated) address. Passing in h2g(address) makes the guest process a lot happier. To make the code more obvious, introduce a h2g_nocheck() macro that does the same as h2g(), but allows us to convert addresses that may be outside of guest mapped range into the guest's view of address space. This fixes java running in arm-linux-user for me. Signed-off-by: Alexander Graf Signed-off-by: Riku Voipio --- include/exec/cpu-all.h | 8 ++++++-- user-exec.c | 4 ++++ 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h index 5084202217..f1cde978ab 100644 --- a/include/exec/cpu-all.h +++ b/include/exec/cpu-all.h @@ -209,11 +209,15 @@ extern unsigned long reserved_va; }) #endif -#define h2g(x) ({ \ +#define h2g_nocheck(x) ({ \ unsigned long __ret = (unsigned long)(x) - GUEST_BASE; \ + (abi_ulong)__ret; \ +}) + +#define h2g(x) ({ \ /* Check if given address fits target address space */ \ assert(h2g_valid(x)); \ - (abi_ulong)__ret; \ + h2g_nocheck(x); \ }) #define saddr(x) g2h(x) diff --git a/user-exec.c b/user-exec.c index d45ca8e877..82bfa66ce3 100644 --- a/user-exec.c +++ b/user-exec.c @@ -95,6 +95,10 @@ static inline int handle_cpu_signal(uintptr_t pc, unsigned long address, return 1; } + /* Convert forcefully to guest address space, invalid addresses + are still valid segv ones */ + address = h2g_nocheck(address); + env = current_cpu->env_ptr; /* see if it is an MMU fault */ ret = cpu_handle_mmu_fault(env, address, is_write, MMU_USER_IDX); -- cgit v1.2.1