DBGDTRTX_EL0, Debug Data Transfer Register, Transmit

The DBGDTRTX_EL0 characteristics are:

Purpose

Transfers data from the PE to an external debugger. For example, it is used by a debug target to transfer data to the debugger. See DBGDTR_EL0 for additional architectural mappings. It is a component of the Debug Communication Channel.

Configuration

AArch64 System register DBGDTRTX_EL0 bits [31:0] are architecturally mapped to AArch32 System register DBGDTRTXint[31:0] .

AArch64 System register DBGDTRTX_EL0 bits [31:0] are architecturally mapped to External register DBGDTRTX_EL0[31:0] .

Attributes

DBGDTRTX_EL0 is a 64-bit register.

Field descriptions

The DBGDTRTX_EL0 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
RES0
Return DTRTX
313029282726252423222120191817161514131211109876543210

Bits [63:32]

Reserved, RES0.

Bits [31:0]

Return DTRTX.

Writes to this register:

After the write, TXfull is set to 1.

For the full behavior of the Debug Communications Channel, see 'The Debug Communication Channel and Instruction Transfer Register'.

On a Cold reset, this field resets to an architecturally UNKNOWN value.

On a Warm reset, the value of this field is unchanged.

Accessing the DBGDTRTX_EL0

Accesses to this register use the following encodings:

MSR DBGDTRTX_EL0, <Xt>

op0op1CRnCRmop2
0b100b0110b00000b01010b000

if Halted() then DBGDTRTX_EL0 = X[t]; elsif PSTATE.EL == EL0 then if MDSCR_EL1.TDCC == '1' then if EL2Enabled() && HCR_EL2.TGE == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else AArch64.SystemAccessTrap(EL1, 0x18); elsif EL2Enabled() && MDCR_EL2.TDCC == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && (HCR_EL2.TGE == '1' || MDCR_EL2.<TDE,TDA> != '00') then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TDCC == '1' then AArch64.SystemAccessTrap(EL3, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TDA == '1' then AArch64.SystemAccessTrap(EL3, 0x18); else DBGDTRTX_EL0 = X[t]; elsif PSTATE.EL == EL1 then if EL2Enabled() && MDCR_EL2.TDCC == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2.<TDE,TDA> != '00' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TDCC == '1' then AArch64.SystemAccessTrap(EL3, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TDA == '1' then AArch64.SystemAccessTrap(EL3, 0x18); else DBGDTRTX_EL0 = X[t]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && MDCR_EL3.TDCC == '1' then AArch64.SystemAccessTrap(EL3, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TDA == '1' then AArch64.SystemAccessTrap(EL3, 0x18); else DBGDTRTX_EL0 = X[t]; elsif PSTATE.EL == EL3 then DBGDTRTX_EL0 = X[t];




01/07/2020 15:57; 80324f0b9997bede489cc15ad1565345720bcd2a

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