On Wed, 18 Aug 2021 at 20:39, Richard Henderson
<richard.henderson@linaro.org> wrote:
Since the prctl constants are supposed to be generic, supply
any that are not provided by the host.
Split out subroutines for PR_GET_FP_MODE, PR_SET_FP_MODE,
PR_GET_VL, PR_SET_VL, PR_RESET_KEYS, PR_SET_TAGGED_ADDR_CTRL,
PR_GET_TAGGED_ADDR_CTRL. Return EINVAL for guests that do
not support these options rather than pass them on to the host.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
linux-user/aarch64/target_syscall.h | 23 -
linux-user/mips/target_syscall.h | 6 -
linux-user/mips64/target_syscall.h | 6 -
linux-user/syscall.c | 644 ++++++++++++++++------------
+static abi_long do_prctl_get_fp_mode(CPUArchState *env)
+{
+#ifdef TARGET_MIPS
+ abi_long ret = 0;
+
+ if (env->CP0_Status & (1 << CP0St_FR)) {
+ ret |= PR_FP_MODE_FR;
+ }
+ if (env->CP0_Config5 & (1 << CP0C5_FRE)) {
+ ret |= PR_FP_MODE_FRE;
+ }
+ return ret;
+#else
+ return -TARGET_EINVAL;
+#endif
+}
If we're going to refactor the prctl code, I think it would be
better to have architecture-specific prctl handling in
linux-user/$ARCH/prctl.c files rather than lots of target ifdefs
in syscall.c...