| Message ID | 842278e9826c21da2a425feea040657af70a59cd.1537122775.git.noring@nocrew.org |
|---|---|
| State | New |
| Headers | show |
| Series | target/mips: Support R5900 GCC programs in user mode | expand |
On 9/16/18 5:04 PM, Fredrik Noring wrote: > The Linux kernel traps and emulates certain instructions. For user only, > QEMU is the kernel, so we emulate those traps by simply emulating the > instructions directly. > > Signed-off-by: Fredrik Noring <noring@nocrew.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> > --- > target/mips/translate.c | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > > diff --git a/target/mips/translate.c b/target/mips/translate.c > index c35be0053b..77d678353e 100644 > --- a/target/mips/translate.c > +++ b/target/mips/translate.c > @@ -1887,6 +1887,20 @@ static inline void check_insn_opc_removed(DisasContext *ctx, int flags) > } > } > > +/* > + * Unless user only, when the kernel emulates the code, a "reserved > + * instruction" exception is generated if the CPU has corresponding > + * flag set which indicates that the instruction has been removed. > + */ > +static inline void check_insn_opc_user_only(DisasContext *ctx, int flags) > +{ > +#ifndef CONFIG_USER_ONLY > + if (unlikely(ctx->insn_flags & flags)) { > + generate_exception_end(ctx, EXCP_RI); > + } > +#endif > +} > + > /* This code generates a "reserved instruction" exception if the > CPU does not support 64-bit paired-single (PS) floating point data type */ > static inline void check_ps(DisasContext *ctx) >
diff --git a/target/mips/translate.c b/target/mips/translate.c index c35be0053b..77d678353e 100644 --- a/target/mips/translate.c +++ b/target/mips/translate.c @@ -1887,6 +1887,20 @@ static inline void check_insn_opc_removed(DisasContext *ctx, int flags) } } +/* + * Unless user only, when the kernel emulates the code, a "reserved + * instruction" exception is generated if the CPU has corresponding + * flag set which indicates that the instruction has been removed. + */ +static inline void check_insn_opc_user_only(DisasContext *ctx, int flags) +{ +#ifndef CONFIG_USER_ONLY + if (unlikely(ctx->insn_flags & flags)) { + generate_exception_end(ctx, EXCP_RI); + } +#endif +} + /* This code generates a "reserved instruction" exception if the CPU does not support 64-bit paired-single (PS) floating point data type */ static inline void check_ps(DisasContext *ctx)
The Linux kernel traps and emulates certain instructions. For user only, QEMU is the kernel, so we emulate those traps by simply emulating the instructions directly. Signed-off-by: Fredrik Noring <noring@nocrew.org> --- target/mips/translate.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)