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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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2
linux-user/microblaze/cpu_loop.c
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@ -48,7 +48,7 @@ void cpu_loop(CPUMBState *env)
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */
break;
case EXCP_BREAK:
case EXCP_SYSCALL:
/* Return address is 4 bytes after the call. */
env->regs[14] += 4;
env->pc = env->regs[14];