qemu-e2k/linux-user
Vincent Fazio feb39b6228 target/ppc: don't byte swap ELFv2 signal handler
Previously, the signal handler would be byte swapped if the target and
host CPU used different endianness. This would cause a SIGSEGV when
attempting to translate the opcode pointed to by the swapped address.

 Thread 1 "qemu-ppc64" received signal SIGSEGV, Segmentation fault.
 0x00000000600a9257 in ldl_he_p (ptr=0x4c2c061000000000) at qemu/include/qemu/bswap.h:351
 351        __builtin_memcpy(&r, ptr, sizeof(r));

 #0  0x00000000600a9257 in ldl_he_p (ptr=0x4c2c061000000000) at qemu/include/qemu/bswap.h:351
 #1  0x00000000600a92fe in ldl_be_p (ptr=0x4c2c061000000000) at qemu/include/qemu/bswap.h:449
 #2  0x00000000600c0790 in translator_ldl_swap at qemu/include/exec/translator.h:201
 #3  0x000000006011c1ab in ppc_tr_translate_insn at qemu/target/ppc/translate.c:7856
 #4  0x000000006005ae70 in translator_loop at qemu/accel/tcg/translator.c:102

The signal handler will be byte swapped as a result of the __get_user()
call in sigaction() if it is necessary, no additional swap is required.

Signed-off-by: Vincent Fazio <vfazio@gmail.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200319133244.8818-1-vfazio@xes-inc.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2020-03-24 11:56:37 +11:00
..
aarch64 linux-user, aarch64: sync syscall numbers with kernel v5.5 2020-03-20 16:02:00 +01:00
alpha linux-user, alpha: add syscall table generation support 2020-03-20 16:02:00 +01:00
arm linux-user: update syscall.tbl from linux 0bf999f9c5e7 2020-03-20 16:02:00 +01:00
cris linux-user: Introduce cpu_clone_regs_parent 2019-11-06 13:43:25 +01:00
generic linux-user: Introduce TARGET_HAVE_ARCH_STRUCT_FLOCK 2019-07-02 16:56:46 +02:00
host linux-user: Add safe_syscall for riscv64 host 2018-12-26 06:40:02 +11:00
hppa linux-user: update syscall.tbl from linux 0bf999f9c5e7 2020-03-20 16:02:00 +01:00
i386 linux-user: update syscall.tbl from linux 0bf999f9c5e7 2020-03-20 16:02:00 +01:00
m68k linux-user: update syscall.tbl from linux 0bf999f9c5e7 2020-03-20 16:02:00 +01:00
microblaze linux-user: update syscall.tbl from linux 0bf999f9c5e7 2020-03-20 16:02:00 +01:00
mips linux-user,mips: update syscall-args-o32.c.inc 2020-03-20 16:02:00 +01:00
mips64 linux-user: update syscall.tbl from linux 0bf999f9c5e7 2020-03-20 16:02:00 +01:00
nios2 linux-user, nios2: sync syscall numbers with kernel v5.5 2020-03-20 16:02:00 +01:00
openrisc linux-user, openrisc: sync syscall numbers with kernel v5.5 2020-03-20 16:02:00 +01:00
ppc target/ppc: don't byte swap ELFv2 signal handler 2020-03-24 11:56:37 +11:00
riscv linux-user/riscv: Update the syscall_nr's to the 5.5 kernel 2020-03-20 16:01:59 +01:00
s390x linux-user: update syscall.tbl from linux 0bf999f9c5e7 2020-03-20 16:02:00 +01:00
sh4 linux-user: update syscall.tbl from linux 0bf999f9c5e7 2020-03-20 16:02:00 +01:00
sparc linux-user: update syscall.tbl from linux 0bf999f9c5e7 2020-03-20 16:02:00 +01:00
sparc64 linux-user: update syscall.tbl from linux 0bf999f9c5e7 2020-03-20 16:02:00 +01:00
tilegx linux-user: Introduce cpu_clone_regs_parent 2019-11-06 13:43:25 +01:00
x86_64 linux-user: update syscall.tbl from linux 0bf999f9c5e7 2020-03-20 16:02:00 +01:00
xtensa linux-user: update syscall.tbl from linux 0bf999f9c5e7 2020-03-20 16:02:00 +01:00
Makefile.objs linux-user, mips64: add syscall table generation support 2020-03-20 16:02:00 +01:00
cpu_loop-common.h cpu: Replace ENV_GET_CPU with env_cpu 2019-06-10 07:03:34 -07:00
elfload.c linux-user: Add AT_EXECFN auxval 2020-03-20 15:51:53 +01:00
errno_defs.h Supply missing header guards 2019-06-12 13:20:21 +02:00
exit.c build: move TARGET_GPROF to config-host.mak 2020-02-12 16:29:27 +01:00
fd-trans.c linux-user: Use `qemu_log' for non-strace logging 2020-02-19 11:17:40 +01:00
fd-trans.h linux-user: move TargetFdTrans functions to their own file 2018-09-25 22:36:47 +02:00
flat.h Supply missing header guards 2019-06-12 13:20:21 +02:00
flatload.c linux-user/flatload: fix initial stack pointer alignment 2018-10-30 11:23:32 -07:00
ioctls.h linux-user: Add support for selected alsa timer instructions using ioctls 2020-02-19 11:17:40 +01:00
linux_loop.h linux-user: Add loop control ioctls 2016-07-19 15:22:33 +03:00
linuxload.c avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
main.c linux-user: remove gemu_log from the linux-user tree 2020-02-19 11:17:40 +01:00
mmap.c linux-user: Update TASK_UNMAPPED_BASE for aarch64 2020-03-20 15:51:54 +01:00
qemu.h linux-user: remove gemu_log from the linux-user tree 2020-02-19 11:17:40 +01:00
safe-syscall.S linux-user: Provide safe_syscall for fixing races between signals and syscalls 2016-05-27 14:49:51 +03:00
signal-common.h linux-user: Make sigaltstack stacks per-thread 2019-07-26 19:24:33 +02:00
signal.c linux-user: Use `qemu_log' for strace 2020-02-19 11:17:40 +01:00
socket.h Supply missing header guards 2019-06-12 13:20:21 +02:00
strace.c linux-user: Protect more syscalls 2020-03-20 16:01:46 +01:00
strace.list linux-user/strace: Improve output of various syscalls 2020-02-19 11:17:40 +01:00
syscall.c linux-user, x86_64, i386: cleanup TARGET_NR_arch_prctl 2020-03-20 16:02:00 +01:00
syscall_defs.h linux-user: Add support for selected alsa timer instructions using ioctls 2020-02-19 11:17:40 +01:00
syscall_types.h linux-user: Add support for getting/setting selected alsa timer parameters using ioctls 2020-02-19 11:17:40 +01:00
target_flat.h Supply missing header guards 2019-06-12 13:20:21 +02:00
trace-events linux-user: fix use of SIGRTMIN 2020-02-12 18:56:41 +01:00
uaccess.c avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
uname.c cpu: Replace ENV_GET_CPU with env_cpu 2019-06-10 07:03:34 -07:00
uname.h Clean up decorations and whitespace around header guards 2016-07-12 16:20:46 +02:00
vm86.c linux-user: Use `qemu_log' for non-strace logging 2020-02-19 11:17:40 +01:00