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/* The fake debug assert instructions
*
* Copyright 2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/ptrace.h>
const char * const greg_names[] = {
"R0", "R1", "R2", "R3", "R4", "R5", "R6", "R7",
"P0", "P1", "P2", "P3", "P4", "P5", "SP", "FP",
"I0", "I1", "I2", "I3", "M0", "M1", "M2", "M3",
"B0", "B1", "B2", "B3", "L0", "L1", "L2", "L3",
"A0.X", "A0.W", "A1.X", "A1.W", "<res>", "<res>", "ASTAT", "RETS",
"<res>", "<res>", "<res>", "<res>", "<res>", "<res>", "<res>", "<res>",
"LC0", "LT0", "LB0", "LC1", "LT1", "LB1", "CYCLES", "CYCLES2",
"USP", "SEQSTAT", "SYSCFG", "RETI", "RETX", "RETN", "RETE", "EMUDAT",
};
static const char *get_allreg_name(int grp, int reg)
{
return greg_names[(grp << 3) | reg];
}
/*
* Unfortunately, the pt_regs structure is not laid out the same way as the
* hardware register file, so we need to do some fix ups.
*
* CYCLES is not stored in the pt_regs structure - so, we just read it from
* the hardware.
*
* Don't support:
* - All reserved registers
* - All in group 7 are (supervisors only)
*/
static bool fix_up_reg(struct pt_regs *fp, long *value, int grp, int reg)
{
long *val = &fp->r0;
unsigned long tmp;
/* Only do Dregs and Pregs for now */
if (grp == 5 ||
(grp == 4 && (reg == 4 || reg == 5)) ||
(grp == 7))
return false;
if (grp == 0 || (grp == 1 && reg < 6))
val -= (reg + 8 * grp);
else if (grp == 1 && reg == 6)
val = &fp->usp;
else if (grp == 1 && reg == 7)
val = &fp->fp;
else if (grp == 2) {
val = &fp->i0;
val -= reg;
} else if (grp == 3 && reg >= 4) {
val = &fp->l0;
val -= (reg - 4);
} else if (grp == 3 && reg < 4) {
val = &fp->b0;
val -= reg;
} else if (grp == 4 && reg < 4) {
val = &fp->a0x;
val -= reg;
} else if (grp == 4 && reg == 6)
val = &fp->astat;
else if (grp == 4 && reg == 7)
val = &fp->rets;
else if (grp == 6 && reg < 6) {
val = &fp->lc0;
val -= reg;
} else if (grp == 6 && reg == 6) {
__asm__ __volatile__("%0 = cycles;\n" : "=d"(tmp));
val = &tmp;
} else if (grp == 6 && reg == 7) {
__asm__ __volatile__("%0 = cycles2;\n" : "=d"(tmp));
val = &tmp;
}
*value = *val;
return true;
}
#define PseudoDbg_Assert_opcode 0xf0000000
#define PseudoDbg_Assert_expected_bits 0
#define PseudoDbg_Assert_expected_mask 0xffff
#define PseudoDbg_Assert_regtest_bits 16
#define PseudoDbg_Assert_regtest_mask 0x7
#define PseudoDbg_Assert_grp_bits 19
#define PseudoDbg_Assert_grp_mask 0x7
#define PseudoDbg_Assert_dbgop_bits 22
#define PseudoDbg_Assert_dbgop_mask 0x3
#define PseudoDbg_Assert_dontcare_bits 24
#define PseudoDbg_Assert_dontcare_mask 0x7
#define PseudoDbg_Assert_code_bits 27
#define PseudoDbg_Assert_code_mask 0x1f
/*
* DBGA - debug assert
*/
bool execute_pseudodbg_assert(struct pt_regs *fp, unsigned int opcode)
{
int expected = ((opcode >> PseudoDbg_Assert_expected_bits) & PseudoDbg_Assert_expected_mask);
int dbgop = ((opcode >> (PseudoDbg_Assert_dbgop_bits)) & PseudoDbg_Assert_dbgop_mask);
int grp = ((opcode >> (PseudoDbg_Assert_grp_bits)) & PseudoDbg_Assert_grp_mask);
int regtest = ((opcode >> (PseudoDbg_Assert_regtest_bits)) & PseudoDbg_Assert_regtest_mask);
long value;
if ((opcode & 0xFF000000) != PseudoDbg_Assert_opcode)
return false;
if (!fix_up_reg(fp, &value, grp, regtest))
return false;
if (dbgop == 0 || dbgop == 2) {
/* DBGA ( regs_lo , uimm16 ) */
/* DBGAL ( regs , uimm16 ) */
if (expected != (value & 0xFFFF)) {
pr_notice("DBGA (%s.L,0x%x) failure, got 0x%x\n",
get_allreg_name(grp, regtest),
expected, (unsigned int)(value & 0xFFFF));
return false;
}
} else if (dbgop == 1 || dbgop == 3) {
/* DBGA ( regs_hi , uimm16 ) */
/* DBGAH ( regs , uimm16 ) */
if (expected != ((value >> 16) & 0xFFFF)) {
pr_notice("DBGA (%s.H,0x%x) failure, got 0x%x\n",
get_allreg_name(grp, regtest),
expected, (unsigned int)((value >> 16) & 0xFFFF));
return false;
}
}
fp->pc += 4;
return true;
}
#define PseudoDbg_opcode 0xf8000000
#define PseudoDbg_reg_bits 0
#define PseudoDbg_reg_mask 0x7
#define PseudoDbg_grp_bits 3
#define PseudoDbg_grp_mask 0x7
#define PseudoDbg_fn_bits 6
#define PseudoDbg_fn_mask 0x3
#define PseudoDbg_code_bits 8
#define PseudoDbg_code_mask 0xff
/*
* DBG - debug (dump a register value out)
*/
bool execute_pseudodbg(struct pt_regs *fp, unsigned int opcode)
{
int grp, fn, reg;
long value;
if ((opcode & 0xFF000000) != PseudoDbg_opcode)
return false;
opcode >>= 16;
grp = ((opcode >> PseudoDbg_grp_bits) & PseudoDbg_reg_mask);
fn = ((opcode >> PseudoDbg_fn_bits) & PseudoDbg_fn_mask);
reg = ((opcode >> PseudoDbg_reg_bits) & PseudoDbg_reg_mask);
if (!fix_up_reg(fp, &value, grp, reg))
return false;
pr_notice("DBG %s = %08lx\n", get_allreg_name(grp, reg), value);
fp->pc += 2;
return true;
}
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