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target-arm: Implement minimal DBGVCR, OSDLR_EL1, MDCCSR_EL0 

Implement debug registers DBGVCR, OSDLR_EL1 and MDCCSR_EL0
(as dummy or limited-functionality). 32 bit Linux kernels will
access these at startup so they are required for breakpoints
and watchpoints to be supported.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2014-09-12 14:06:50 +01:00
parent 17a9eb53a9
commit 5e8b12ffbb
1 changed files with 19 additions and 0 deletions
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19
target-arm/helper.c
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@ -2250,10 +2250,29 @@ static const ARMCPRegInfo debug_cp_reginfo[] = {
.access = PL1_RW,
.fieldoffset = offsetof(CPUARMState, cp15.mdscr_el1),
.resetvalue = 0 },
/* MDCCSR_EL0, aka DBGDSCRint. This is a read-only mirror of MDSCR_EL1.
* We don't implement the configurable EL0 access.
*/
{ .name = "MDCCSR_EL0", .state = ARM_CP_STATE_BOTH,
.cp = 14, .opc0 = 2, .opc1 = 0, .crn = 0, .crm = 1, .opc2 = 0,
.type = ARM_CP_NO_MIGRATE,
.access = PL1_R,
.fieldoffset = offsetof(CPUARMState, cp15.mdscr_el1),
.resetfn = arm_cp_reset_ignore },
/* We define a dummy WI OSLAR_EL1, because Linux writes to it. */
{ .name = "OSLAR_EL1", .state = ARM_CP_STATE_BOTH,
.cp = 14, .opc0 = 2, .opc1 = 0, .crn = 1, .crm = 0, .opc2 = 4,
.access = PL1_W, .type = ARM_CP_NOP },
/* Dummy OSDLR_EL1: 32-bit Linux will read this */
{ .name = "OSDLR_EL1", .state = ARM_CP_STATE_BOTH,
.cp = 14, .opc0 = 2, .opc1 = 0, .crn = 1, .crm = 3, .opc2 = 4,
.access = PL1_RW, .type = ARM_CP_NOP },
/* Dummy DBGVCR: Linux wants to clear this on startup, but we don't
* implement vector catch debug events yet.
*/
{ .name = "DBGVCR",
.cp = 14, .opc1 = 0, .crn = 0, .crm = 7, .opc2 = 0,
.access = PL1_RW, .type = ARM_CP_NOP },
REGINFO_SENTINEL
};