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target/arm: remove run-time semihosting checks for linux-user 

Now we do all our checking at translate time we can make cpu_loop a
little bit simpler. We also introduce a simple linux-user semihosting
test case to defend the functionality. The out-of-tree softmmu based
semihosting tests are still more comprehensive.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20190913151845.12582-6-alex.bennee@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Alex Bennée 2019-09-19 14:18:41 +01:00 committed by Peter Maydell
parent ed6e6ba9c4
commit e267255957
2 changed files with 0 additions and 6 deletions
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3
linux-user/arm/cpu_loop.c
View File

@ -325,9 +325,6 @@ void cpu_loop(CPUARMState *env)
if (n == ARM_NR_cacheflush) {
/* nop */
} else if (n == ARM_NR_semihosting
|| n == ARM_NR_thumb_semihosting) {
env->regs[0] = do_arm_semihosting (env);
} else if (n == 0 || n >= ARM_SYSCALL_BASE || env->thumb) {
/* linux syscall */
if (env->thumb || n == 0) {

3
linux-user/arm/target_syscall.h
View File

@ -18,9 +18,6 @@ struct target_pt_regs {
#define ARM_NR_set_tls (ARM_NR_BASE + 5)
#define ARM_NR_get_tls (ARM_NR_BASE + 6)
#define ARM_NR_semihosting 0x123456
#define ARM_NR_thumb_semihosting 0xAB
#if defined(TARGET_WORDS_BIGENDIAN)
#define UNAME_MACHINE "armv5teb"
#else