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| 1 | +// SPDX-License-Identifier: GPL-2.0-or-later |
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1 | 2 | /* |
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2 | 3 | * Copyright 2016, Cyril Bur, IBM Corp. |
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3 | | - * |
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4 | | - * This program is free software; you can redistribute it and/or |
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5 | | - * modify it under the terms of the GNU General Public License |
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6 | | - * as published by the Free Software Foundation; either version |
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7 | | - * 2 of the License, or (at your option) any later version. |
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8 | | - * |
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9 | 4 | * |
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10 | 5 | * Test the kernel's signal frame code. |
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11 | 6 | * |
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12 | 7 | * The kernel sets up two sets of ucontexts if the signal was to be |
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13 | | - * delivered while the thread was in a transaction. |
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| 8 | + * delivered while the thread was in a transaction (referred too as |
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| 9 | + * first and second contexts). |
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14 | 10 | * Expected behaviour is that the checkpointed state is in the user |
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15 | | - * context passed to the signal handler. The speculated state can be |
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16 | | - * accessed with the uc_link pointer. |
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| 11 | + * context passed to the signal handler (first context). The speculated |
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| 12 | + * state can be accessed with the uc_link pointer (second context). |
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17 | 13 | * |
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18 | 14 | * The rationale for this is that if TM unaware code (which linked |
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19 | 15 | * against TM libs) installs a signal handler it will not know of the |
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.. | .. |
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33 | 29 | |
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34 | 30 | #define MAX_ATTEMPT 500000 |
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35 | 31 | |
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36 | | -#define NV_FPU_REGS 18 |
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| 32 | +#define NV_FPU_REGS 18 /* Number of non-volatile FP registers */ |
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| 33 | +#define FPR14 14 /* First non-volatile FP register to check in f14-31 subset */ |
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37 | 34 | |
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38 | 35 | long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss); |
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39 | 36 | |
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40 | | -/* Be sure there are 2x as many as there are NV FPU regs (2x18) */ |
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| 37 | +/* Test only non-volatile registers, i.e. 18 fpr registers from f14 to f31 */ |
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41 | 38 | static double fps[] = { |
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| 39 | + /* First context will be set with these values, i.e. non-speculative */ |
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42 | 40 | 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, |
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| 41 | + /* Second context will be set with these values, i.e. speculative */ |
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43 | 42 | -1,-2,-3,-4,-5,-6,-7,-8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-18 |
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44 | 43 | }; |
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45 | 44 | |
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46 | | -static sig_atomic_t fail; |
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| 45 | +static sig_atomic_t fail, broken; |
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47 | 46 | |
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48 | 47 | static void signal_usr1(int signum, siginfo_t *info, void *uc) |
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49 | 48 | { |
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.. | .. |
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51 | 50 | ucontext_t *ucp = uc; |
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52 | 51 | ucontext_t *tm_ucp = ucp->uc_link; |
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53 | 52 | |
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54 | | - for (i = 0; i < NV_FPU_REGS && !fail; i++) { |
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55 | | - fail = (ucp->uc_mcontext.fp_regs[i + 14] != fps[i]); |
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56 | | - fail |= (tm_ucp->uc_mcontext.fp_regs[i + 14] != fps[i + NV_FPU_REGS]); |
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57 | | - if (fail) |
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58 | | - printf("Failed on %d FP %g or %g\n", i, ucp->uc_mcontext.fp_regs[i + 14], tm_ucp->uc_mcontext.fp_regs[i + 14]); |
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| 53 | + for (i = 0; i < NV_FPU_REGS; i++) { |
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| 54 | + /* Check first context. Print all mismatches. */ |
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| 55 | + fail = (ucp->uc_mcontext.fp_regs[FPR14 + i] != fps[i]); |
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| 56 | + if (fail) { |
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| 57 | + broken = 1; |
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| 58 | + printf("FPR%d (1st context) == %g instead of %g (expected)\n", |
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| 59 | + FPR14 + i, ucp->uc_mcontext.fp_regs[FPR14 + i], fps[i]); |
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| 60 | + } |
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| 61 | + } |
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| 62 | + |
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| 63 | + for (i = 0; i < NV_FPU_REGS; i++) { |
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| 64 | + /* Check second context. Print all mismatches. */ |
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| 65 | + fail = (tm_ucp->uc_mcontext.fp_regs[FPR14 + i] != fps[NV_FPU_REGS + i]); |
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| 66 | + if (fail) { |
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| 67 | + broken = 1; |
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| 68 | + printf("FPR%d (2nd context) == %g instead of %g (expected)\n", |
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| 69 | + FPR14 + i, tm_ucp->uc_mcontext.fp_regs[FPR14 + i], fps[NV_FPU_REGS + i]); |
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| 70 | + } |
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59 | 71 | } |
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60 | 72 | } |
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61 | 73 | |
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.. | .. |
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77 | 89 | } |
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78 | 90 | |
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79 | 91 | i = 0; |
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80 | | - while (i < MAX_ATTEMPT && !fail) { |
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| 92 | + while (i < MAX_ATTEMPT && !broken) { |
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| 93 | + /* |
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| 94 | + * tm_signal_self_context_load will set both first and second |
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| 95 | + * contexts accordingly to the values passed through non-NULL |
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| 96 | + * array pointers to it, in that case 'fps', and invoke the |
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| 97 | + * signal handler installed for SIGUSR1. |
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| 98 | + */ |
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81 | 99 | rc = tm_signal_self_context_load(pid, NULL, fps, NULL, NULL); |
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82 | 100 | FAIL_IF(rc != pid); |
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83 | 101 | i++; |
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84 | 102 | } |
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85 | 103 | |
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86 | | - return fail; |
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| 104 | + return (broken); |
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87 | 105 | } |
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88 | 106 | |
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89 | 107 | int main(void) |
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