Commit 94159135 authored by Meador Inge's avatar Meador Inge Committed by Aurelien Jarno
Browse files

target-mips: Enable access to required RDHWR hardware registers 



While running in the usermode emulator all of the required*
MIPS32r2 RDHWR hardware registers should be accessible (the
Linux kernel enables access to these same registers).  Note
that these registers are still enabled when the MIPS ISA is
not release 2.  This is OK since the Linux kernel emulates
access to them when they are not available in hardware.

* There is also the ULR register which is only recommended
  for full release 2 compliance.  Incidentally, accessing
  this register in the current implementation works fine
  without flipping its access bit.

Signed-off-by: default avatarMeador Inge <meadori@codesourcery.com>
Signed-off-by: default avatarAurelien Jarno <aurelien@aurel32.net>
parent 58617a79

target-mips/translate.c

+3 −2
Original line number Diff line number Diff line
@@ -12768,8 +12768,9 @@ void cpu_state_reset(CPUMIPSState *env) 


#if defined(CONFIG_USER_ONLY)

    env->hflags = MIPS_HFLAG_UM;

    /* Enable access to the SYNCI_Step register.  */

    env->CP0_HWREna |= (1 << 1);

    /* Enable access to the CPUNum, SYNCI_Step, CC, and CCRes RDHWR

       hardware registers.  */

    env->CP0_HWREna |= 0x0000000F;

    if (env->CP0_Config1 & (1 << CP0C1_FP)) {

        env->hflags |= MIPS_HFLAG_FPU;

    }