| Robin Getz | 6ce3e9c | 2010-03-16 14:40:17 +0000 | [diff] [blame^] | 1 | /* The fake debug assert instructions |
| 2 | * |
| 3 | * Copyright 2010 Analog Devices Inc. |
| 4 | * |
| 5 | * Licensed under the GPL-2 or later |
| 6 | */ |
| 7 | |
| 8 | #include <linux/types.h> |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/ptrace.h> |
| 11 | |
| 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 |
| 25 | |
| 26 | bool execute_pseudodbg_assert(struct pt_regs *fp, unsigned int opcode) |
| 27 | { |
| 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; |
| 33 | |
| 34 | if ((opcode & 0xFF000000) != PseudoDbg_Assert_opcode) |
| 35 | return false; |
| 36 | |
| 37 | /* Only do Dregs and Pregs for now */ |
| 38 | if (grp > 1) |
| 39 | return false; |
| 40 | |
| 41 | /* |
| 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. |
| 44 | */ |
| 45 | if (grp == 0 || (grp == 1 && regtest < 6)) |
| 46 | value -= (regtest + 8 * grp); |
| 47 | else if (grp == 1 && regtest == 6) |
| 48 | value = &fp->usp; |
| 49 | else if (grp == 1 && regtest == 7) |
| 50 | value = &fp->fp; |
| 51 | |
| 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)); |
| 58 | return false; |
| 59 | } |
| 60 | |
| 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)); |
| 67 | return false; |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | fp->pc += 4; |
| 72 | return true; |
| 73 | } |