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target/microblaze: Convert brk and brki to decodetree

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Split these out of the normal branch instructions, as they require
special handling.  Perform the entire operation inline, instead of
raising EXCP_BREAK to do the work in mb_cpu_do_interrupt.

This fixes a bug in that brki rd, imm, for imm != 0x18 is not
supposed to set MSR_BIP.  This fixes a bug in that imm == 0 is
the reset vector and 0x18 is the debug vector, and neither should
raise a tcg exception in system mode.

Introduce EXCP_SYSCALL for microblaze-linux-user.

Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-08-23 09:17:22 -07:00
parent 0c3da918de
commit f523531471
5 changed files with 79 additions and 53 deletions
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11
target/microblaze/insns.decode
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@ -19,7 +19,9 @@
&typea0 rd ra
&typea rd ra rb
&typea_br rd rb
&typeb rd ra imm
&typeb_br rd imm
# Include any IMM prefix in the value reported.
%extimm 0:s16 !function=typeb_imm
@ -30,9 +32,15 @@
# Officially typea, but with rb==0, which is not used.
@typea0 ...... rd:5 ra:5 ................ &typea0
# Officially typea, but with ra as opcode.
@typea_br ...... rd:5 ..... rb:5 ........... &typea_br
# Officially typeb, but any immediate extension is unused.
@typeb_bs ...... rd:5 ra:5 ..... ...... imm:5 &typeb
# Officially typeb, but with ra as opcode.
@typeb_br ...... rd:5 ..... ................ &typeb_br imm=%extimm
# For convenience, extract the two imm_w/imm_s fields, then pack
# them back together as "imm". Doing this makes it easiest to
# match the required zero at bit 5.
@ -60,6 +68,9 @@ andi 101001 ..... ..... ................ @typeb
andn 100011 ..... ..... ..... 000 0000 0000 @typea
andni 101011 ..... ..... ................ @typeb
brk 100110 ..... 01100 ..... 000 0000 0000 @typea_br
brki 101110 ..... 01100 ................ @typeb_br
bsrl 010001 ..... ..... ..... 000 0000 0000 @typea
bsra 010001 ..... ..... ..... 010 0000 0000 @typea
bsll 010001 ..... ..... ..... 100 0000 0000 @typea