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target: aarch64: access reg SPSR_EL2 only in EL2 and EL3

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The register SPSR_EL2 is accessible and it's content is relevant
only when the target is in EL2 or EL3.
Virtualization SW in EL1 can also access it, but this either
triggers a trap to EL2 or returns SPSR_EL1. Debugger should not
mix the real SPSR_EL2 with the virtual register.
Plus, the register is 64 bits wide.

Without this patch, an error:
	Error: Opcode 0xd53c4000, DSCR.ERR=1, DSCR.EL=1
is triggered by GDB register window or through GDB command
        x/p $SPSR_EL2
or through OpenOCD command
        reg SPSR_EL2

Detect the EL and return error if the register cannot be accessed.
Handle the register as 64 bits.

Change-Id: If3792296b36282c08d597dd46cfe044d6b8288ea
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/8273
Tested-by: jenkins
This commit is contained in:
Antonio Borneo
2024-05-14 12:16:13 +02:00
parent 766a84b798
commit 2a63fabd09
1 changed files with 15 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
src/target/armv8.c
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@@ -365,9 +365,13 @@ static int armv8_read_reg(struct armv8_common *armv8, int regnum, uint64_t *regv
value_64 = value;
break;
case ARMV8_SPSR_EL2:
retval = dpm->instr_read_data_r0(dpm,
ARMV8_MRS(SYSTEM_SPSR_EL2, 0), &value);
value_64 = value;
if (curel < SYSTEM_CUREL_EL2) {
LOG_DEBUG("SPSR_EL2 not accessible in EL%u", curel);
retval = ERROR_FAIL;
break;
}
retval = dpm->instr_read_data_r0_64(dpm,
ARMV8_MRS(SYSTEM_SPSR_EL2, 0), &value_64);
break;
case ARMV8_SPSR_EL3:
if (curel < SYSTEM_CUREL_EL3) {
@@ -509,9 +513,13 @@ static int armv8_write_reg(struct armv8_common *armv8, int regnum, uint64_t valu
ARMV8_MSR_GP(SYSTEM_SPSR_EL1, 0), value);
break;
case ARMV8_SPSR_EL2:
value = value_64;
retval = dpm->instr_write_data_r0(dpm,
ARMV8_MSR_GP(SYSTEM_SPSR_EL2, 0), value);
if (curel < SYSTEM_CUREL_EL2) {
LOG_DEBUG("SPSR_EL2 not accessible in EL%u", curel);
retval = ERROR_FAIL;
break;
}
retval = dpm->instr_write_data_r0_64(dpm,
ARMV8_MSR_GP(SYSTEM_SPSR_EL2, 0), value_64);
break;
case ARMV8_SPSR_EL3:
if (curel < SYSTEM_CUREL_EL3) {
@@ -1563,7 +1571,7 @@ static const struct {
NULL},
{ ARMV8_ESR_EL2, "ESR_EL2", 64, ARMV8_64_EL2H, REG_TYPE_UINT64, "banked", "net.sourceforge.openocd.banked",
NULL},
{ ARMV8_SPSR_EL2, "SPSR_EL2", 32, ARMV8_64_EL2H, REG_TYPE_UINT32, "banked", "net.sourceforge.openocd.banked",
{ ARMV8_SPSR_EL2, "SPSR_EL2", 64, ARMV8_64_EL2H, REG_TYPE_UINT64, "banked", "net.sourceforge.openocd.banked",
NULL},
{ ARMV8_ELR_EL3, "ELR_EL3", 64, ARMV8_64_EL3H, REG_TYPE_CODE_PTR, "banked", "net.sourceforge.openocd.banked",