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| author | Peter Maydell <peter.maydell@linaro.org> | 2016-05-12 18:47:42 +0100 |
|---|---|---|
| committer | Riku Voipio <riku.voipio@linaro.org> | 2016-05-27 14:49:50 +0300 |
| commit | a9175169cc55ecff23a158dfee7d9cbb0b75d185 (patch) | |
| tree | 25dc5a2ef724bbe40d13e40688be183641c152ee /linux-user/main.c | |
| parent | 6205086558955402983f1c2ff9e4c3ebe9f1c678 (diff) | |
| download | qemu-a9175169cc55ecff23a158dfee7d9cbb0b75d185.tar.gz | |
linux-user: Support for restarting system calls for tilegx targets
Update the tilegx main loop and sigreturn code:
* on TARGET_ERESTARTSYS, wind guest PC backwards to repeat syscall insn
* return -TARGET_QEMU_ESIGRETURN from sigreturn rather than current R_RE
* handle TARGET_QEMU_ESIGRETURN in the main loop as the indication
that the main loop should not touch any guest CPU state
Note that this fixes a bug where a sigreturn which happened to have
an errno value in TILEGX_R_RE would incorrectly cause TILEGX_R_ERR
to get set.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Diffstat (limited to 'linux-user/main.c')
| -rw-r--r-- | linux-user/main.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/linux-user/main.c b/linux-user/main.c index a532221ebc..4607e48278 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -3706,15 +3706,20 @@ void cpu_loop(CPUTLGState *env) cpu_exec_end(cs); switch (trapnr) { case TILEGX_EXCP_SYSCALL: - env->regs[TILEGX_R_RE] = do_syscall(env, env->regs[TILEGX_R_NR], - env->regs[0], env->regs[1], - env->regs[2], env->regs[3], - env->regs[4], env->regs[5], - env->regs[6], env->regs[7]); - env->regs[TILEGX_R_ERR] = TILEGX_IS_ERRNO(env->regs[TILEGX_R_RE]) - ? - env->regs[TILEGX_R_RE] - : 0; + { + abi_ulong ret = do_syscall(env, env->regs[TILEGX_R_NR], + env->regs[0], env->regs[1], + env->regs[2], env->regs[3], + env->regs[4], env->regs[5], + env->regs[6], env->regs[7]); + if (ret == -TARGET_ERESTARTSYS) { + env->pc -= 8; + } else if (ret != -TARGET_QEMU_ESIGRETURN) { + env->regs[TILEGX_R_RE] = ret; + env->regs[TILEGX_R_ERR] = TILEGX_IS_ERRNO(ret) ? -ret : 0; + } break; + } case TILEGX_EXCP_OPCODE_EXCH: do_exch(env, true, false); break; |