1 /* The fake debug assert instructions
3 * Copyright 2010 Analog Devices Inc.
5 * Licensed under the GPL-2 or later
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/ptrace.h>
12 #define PseudoDbg_Assert_opcode 0xf0000000
13 #define PseudoDbg_Assert_expected_bits 0
14 #define PseudoDbg_Assert_expected_mask 0xffff
15 #define PseudoDbg_Assert_regtest_bits 16
16 #define PseudoDbg_Assert_regtest_mask 0x7
17 #define PseudoDbg_Assert_grp_bits 19
18 #define PseudoDbg_Assert_grp_mask 0x7
19 #define PseudoDbg_Assert_dbgop_bits 22
20 #define PseudoDbg_Assert_dbgop_mask 0x3
21 #define PseudoDbg_Assert_dontcare_bits 24
22 #define PseudoDbg_Assert_dontcare_mask 0x7
23 #define PseudoDbg_Assert_code_bits 27
24 #define PseudoDbg_Assert_code_mask 0x1f
26 bool execute_pseudodbg_assert(struct pt_regs *fp, unsigned int opcode)
28 int expected = ((opcode >> PseudoDbg_Assert_expected_bits) & PseudoDbg_Assert_expected_mask);
29 int dbgop = ((opcode >> (PseudoDbg_Assert_dbgop_bits)) & PseudoDbg_Assert_dbgop_mask);
30 int grp = ((opcode >> (PseudoDbg_Assert_grp_bits)) & PseudoDbg_Assert_grp_mask);
31 int regtest = ((opcode >> (PseudoDbg_Assert_regtest_bits)) & PseudoDbg_Assert_regtest_mask);
32 long *value = &fp->r0;
34 if ((opcode & 0xFF000000) != PseudoDbg_Assert_opcode)
37 /* Only do Dregs and Pregs for now */
42 * Unfortunately, the pt_regs structure is not laid out the same way as the
43 * hardware register file, so we need to do some fix ups.
45 if (grp == 0 || (grp == 1 && regtest < 6))
46 value -= (regtest + 8 * grp);
47 else if (grp == 1 && regtest == 6)
49 else if (grp == 1 && regtest == 7)
52 if (dbgop == 0 || dbgop == 2) {
53 /* DBGA ( regs_lo , uimm16 ) */
54 /* DBGAL ( regs , uimm16 ) */
55 if (expected != (*value & 0xFFFF)) {
56 pr_notice("DBGA (%s%i.L,0x%x) failure, got 0x%x\n", grp ? "P" : "R",
57 regtest, expected, (unsigned int)(*value & 0xFFFF));
61 } else if (dbgop == 1 || dbgop == 3) {
62 /* DBGA ( regs_hi , uimm16 ) */
63 /* DBGAH ( regs , uimm16 ) */
64 if (expected != ((*value >> 16) & 0xFFFF)) {
65 pr_notice("DBGA (%s%i.H,0x%x) failure, got 0x%x\n", grp ? "P" : "R",
66 regtest, expected, (unsigned int)((*value >> 16) & 0xFFFF));