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Peter Maydell 3986a1721e linux-user/arm: Fix identification of syscall numbers 
Our code to identify syscall numbers has some issues:
 * for Thumb mode, we never need the immediate value from the insn,
   but we always read it anyway
 * bad immediate values in the svc insn should cause a SIGILL, but we
   were abort()ing instead (via "goto error")

We can fix both these things by refactoring the code that identifies
the syscall number to more closely follow the kernel COMPAT_OABI code:
 * for Thumb it is always r7
 * for Arm, if the immediate value is 0, then this is an EABI call
   with the syscall number in r7
 * otherwise, we XOR the immediate value with 0x900000
   (ARM_SYSCALL_BASE for QEMU; __NR_OABI_SYSCALL_BASE in the kernel),
   which converts valid syscall immediates into the desired value,
   and puts all invalid immediates in the range 0x100000 or above
 * then we can just let the existing "value too large, deliver
   SIGILL" case handle invalid numbers, and drop the 'goto error'

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Message-id: 20200420212206.12776-5-peter.maydell@linaro.org
2020-05-21 20:00:18 +01:00
..
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/arm: Fix identification of syscall numbers 2020-05-21 20:00:18 +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/i386: Emulate x86_64 vsyscalls 2020-03-26 08:08:54 +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 linux-user/ppc: Fix padding in mcontext_t for ppc64 2020-04-17 10:38:29 +10:00
riscv linux-user/riscv: fix up struct target_ucontext definition 2020-04-29 13:16:37 -07:00
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
cpu_loop-common.h cpu: Replace ENV_GET_CPU with env_cpu 2019-06-10 07:03:34 -07:00
elfload.c linux-user: completely re-write init_guest_space 2020-05-15 15:25:16 +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: completely re-write init_guest_space 2020-05-15 15:25:16 +01:00
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 exec/cpu-all: Use bool for have_guest_base 2020-05-15 15:25:16 +01:00
Makefile.objs linux-user, mips64: add syscall table generation support 2020-03-20 16:02:00 +01:00
mmap.c linux-user: Update TASK_UNMAPPED_BASE for aarch64 2020-03-20 15:51:54 +01:00
qemu.h linux-user: completely re-write init_guest_space 2020-05-15 15:25:16 +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_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
syscall.c linux-user/syscall.c: add target-to-host mapping for epoll_create1() 2020-04-16 09:24:22 +02:00
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