OSDTRTX

Used for save/restore of DBGDTRTX_EL0. It is a component of the Debug Communications Channel.

Configuration

AArch64 System register OSDTRTX_EL1 bits [31:0] are architecturally mapped to AArch32 System register DBGDTRTXext[31:0].

Attributes

Field descriptions

Bits [63:32]

Bits [31:0]

Accessing OSDTRTX_EL1

Arm deprecates reads and writes of OSDTRTX_EL1 when the OS Lock is unlocked.

Accesses to this register use the following encodings in the System register encoding space:

MRS <Xt>, OSDTRTX_EL1

op0	op1	CRn	CRm	op2
0b10	0b000	0b0000	0b0011	0b010

if PSTATE.EL == EL0 then UNDEFINED; elsif Halted() && ConstrainUnpredictableBool(Unpredictable_IGNORETRAPINDEBUG) then X[t, 64] = OSDTRTX_EL1; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_FGT) && MDCR_EL3.TDCC == '1' then UNDEFINED; elsif HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3.TDA == '1' then UNDEFINED; elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && MDCR_EL2.TDCC == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2.<TDE,TDA> != '00' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_FGT) && MDCR_EL3.TDCC == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TDA == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = OSDTRTX_EL1; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_FGT) && MDCR_EL3.TDCC == '1' then UNDEFINED; elsif HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3.TDA == '1' then UNDEFINED; elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_FGT) && MDCR_EL3.TDCC == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TDA == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = OSDTRTX_EL1; elsif PSTATE.EL == EL3 then X[t, 64] = OSDTRTX_EL1;

MSR OSDTRTX_EL1, <Xt>

op0	op1	CRn	CRm	op2
0b10	0b000	0b0000	0b0011	0b010

if PSTATE.EL == EL0 then UNDEFINED; elsif Halted() && ConstrainUnpredictableBool(Unpredictable_IGNORETRAPINDEBUG) then OSDTRTX_EL1 = X[t, 64]; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_FGT) && MDCR_EL3.TDCC == '1' then UNDEFINED; elsif HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3.TDA == '1' then UNDEFINED; elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && MDCR_EL2.TDCC == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2.<TDE,TDA> != '00' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_FGT) && MDCR_EL3.TDCC == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TDA == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else OSDTRTX_EL1 = X[t, 64]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_FGT) && MDCR_EL3.TDCC == '1' then UNDEFINED; elsif HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3.TDA == '1' then UNDEFINED; elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_FGT) && MDCR_EL3.TDCC == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TDA == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else OSDTRTX_EL1 = X[t, 64]; elsif PSTATE.EL == EL3 then OSDTRTX_EL1 = X[t, 64];

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
RES0
Return DTRTX without side-effect

OSDTRTX_EL1, OS Lock Data Transfer Register, Transmit

Purpose