| 1 |
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| 2 | #ifndef _ASM_S390_STACKTRACE_H
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| 3 | #define _ASM_S390_STACKTRACE_H
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| 4 |
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| 5 | #include <linux/stacktrace.h>
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| 6 | #include <linux/uaccess.h>
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| 7 | #include <linux/ptrace.h>
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| 8 |
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| 9 | struct stack_frame_user {
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| 10 | unsigned long back_chain;
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| 11 | unsigned long empty1[5];
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| 12 | unsigned long gprs[10];
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| 13 | unsigned long empty2[4];
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| 14 | };
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| 15 |
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| 16 | struct stack_frame_vdso_wrapper {
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| 17 | struct stack_frame_user sf;
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| 18 | unsigned long return_address;
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| 19 | };
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| 20 |
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| 21 | struct perf_callchain_entry_ctx;
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| 22 |
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| 23 | void arch_stack_walk_user_common(stack_trace_consume_fn consume_entry, void *cookie,
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| 24 | struct perf_callchain_entry_ctx *entry,
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| 25 | const struct pt_regs *regs, bool perf);
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| 26 |
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| 27 | enum stack_type {
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| 28 | STACK_TYPE_UNKNOWN,
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| 29 | STACK_TYPE_TASK,
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| 30 | STACK_TYPE_IRQ,
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| 31 | STACK_TYPE_NODAT,
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| 32 | STACK_TYPE_RESTART,
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| 33 | STACK_TYPE_MCCK,
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| 34 | };
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| 35 |
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| 36 | struct stack_info {
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| 37 | enum stack_type type;
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| 38 | unsigned long begin, end;
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| 39 | };
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| 40 |
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| 41 | const char *stack_type_name(enum stack_type type);
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| 42 | int get_stack_info(unsigned long sp, struct task_struct *task,
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| 43 | struct stack_info *info, unsigned long *visit_mask);
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| 44 |
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| 45 | static inline bool on_stack(struct stack_info *info,
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| 46 | unsigned long addr, size_t len)
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| 47 | {
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| 48 | if (info->type == STACK_TYPE_UNKNOWN)
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| 49 | return false;
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| 50 | if (addr + len < addr)
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| 51 | return false;
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| 52 | return addr >= info->begin && addr + len <= info->end;
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| 53 | }
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| 54 |
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| 55 | |
| 56 | * Stack layout of a C stack frame.
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| 57 | * Kernel uses the packed stack layout (-mpacked-stack).
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| 58 |
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| 59 | struct stack_frame {
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| 60 | union {
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| 61 | unsigned long empty[9];
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| 62 | struct {
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| 63 | unsigned long sie_control_block;
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| 64 | unsigned long sie_savearea;
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| 65 | unsigned long sie_return;
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| 66 | unsigned long sie_flags;
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| 67 | unsigned long sie_control_block_phys;
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| 68 | unsigned long sie_guest_asce;
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| 69 | unsigned long sie_irq;
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| 70 | };
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| 71 | };
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| 72 | unsigned long gprs[10];
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| 73 | unsigned long back_chain;
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| 74 | };
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| 75 |
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| 76 | |
| 77 | * Unlike current_stack_pointer which simply contains the current value of %r15
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| 78 | * current_frame_address() returns function stack frame address, which matches
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| 79 | * %r15 upon function invocation. It may differ from %r15 later if function
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| 80 | * allocates stack for local variables or new stack frame to call other
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| 81 | * functions.
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| 82 |
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| 83 | #define current_frame_address() \
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| 84 | ((unsigned long)__builtin_frame_address(0) - \
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| 85 | offsetof(struct stack_frame, back_chain))
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| 86 |
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| 87 | static __always_inline unsigned long get_stack_pointer(struct task_struct *task,
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| 88 | struct pt_regs *regs)
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| 89 | {
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| 90 | if (regs)
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| 91 | return (unsigned long)kernel_stack_pointer(regs);
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| 92 | if (task == current)
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| 93 | return current_frame_address();
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| 94 | return (unsigned long)task->thread.ksp;
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| 95 | }
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| 96 |
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| 97 | |
| 98 | * To keep this simple mark register 2-6 as being changed (volatile)
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| 99 | * by the called function, even though register 6 is saved/nonvolatile.
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| 100 |
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| 101 | #define CALL_FMT_0 "=&d" (r2)
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| 102 | #define CALL_FMT_1 "+&d" (r2)
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| 103 | #define CALL_FMT_2 CALL_FMT_1, "+&d" (r3)
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| 104 | #define CALL_FMT_3 CALL_FMT_2, "+&d" (r4)
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| 105 | #define CALL_FMT_4 CALL_FMT_3, "+&d" (r5)
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| 106 | #define CALL_FMT_5 CALL_FMT_4, "+&d" (r6)
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| 107 |
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| 108 | #define CALL_CLOBBER_5 "0", "1", "14", "cc", "memory"
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| 109 | #define CALL_CLOBBER_4 CALL_CLOBBER_5
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| 110 | #define CALL_CLOBBER_3 CALL_CLOBBER_4, "5"
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| 111 | #define CALL_CLOBBER_2 CALL_CLOBBER_3, "4"
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| 112 | #define CALL_CLOBBER_1 CALL_CLOBBER_2, "3"
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| 113 | #define CALL_CLOBBER_0 CALL_CLOBBER_1
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| 114 |
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| 115 | #define CALL_LARGS_0(...) \
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| 116 | long dummy = 0
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| 117 | #define CALL_LARGS_1(t1, a1) \
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| 118 | long arg1 = (long)(t1)(a1)
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| 119 | #define CALL_LARGS_2(t1, a1, t2, a2) \
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| 120 | CALL_LARGS_1(t1, a1); \
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| 121 | long arg2 = (long)(t2)(a2)
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| 122 | #define CALL_LARGS_3(t1, a1, t2, a2, t3, a3) \
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| 123 | CALL_LARGS_2(t1, a1, t2, a2); \
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| 124 | long arg3 = (long)(t3)(a3)
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| 125 | #define CALL_LARGS_4(t1, a1, t2, a2, t3, a3, t4, a4) \
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| 126 | CALL_LARGS_3(t1, a1, t2, a2, t3, a3); \
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| 127 | long arg4 = (long)(t4)(a4)
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| 128 | #define CALL_LARGS_5(t1, a1, t2, a2, t3, a3, t4, a4, t5, a5) \
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| 129 | CALL_LARGS_4(t1, a1, t2, a2, t3, a3, t4, a4); \
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| 130 | long arg5 = (long)(t5)(a5)
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| 131 |
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| 132 | #define CALL_REGS_0 \
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| 133 | register long r2 asm("2") = dummy
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| 134 | #define CALL_REGS_1 \
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| 135 | register long r2 asm("2") = arg1
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| 136 | #define CALL_REGS_2 \
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| 137 | CALL_REGS_1; \
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| 138 | register long r3 asm("3") = arg2
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| 139 | #define CALL_REGS_3 \
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| 140 | CALL_REGS_2; \
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| 141 | register long r4 asm("4") = arg3
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| 142 | #define CALL_REGS_4 \
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| 143 | CALL_REGS_3; \
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| 144 | register long r5 asm("5") = arg4
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| 145 | #define CALL_REGS_5 \
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| 146 | CALL_REGS_4; \
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| 147 | register long r6 asm("6") = arg5
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| 148 |
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| 149 | #define CALL_TYPECHECK_0(...)
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| 150 | #define CALL_TYPECHECK_1(t, a, ...) \
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| 151 | typecheck(t, a)
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| 152 | #define CALL_TYPECHECK_2(t, a, ...) \
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| 153 | CALL_TYPECHECK_1(__VA_ARGS__); \
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| 154 | typecheck(t, a)
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| 155 | #define CALL_TYPECHECK_3(t, a, ...) \
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| 156 | CALL_TYPECHECK_2(__VA_ARGS__); \
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| 157 | typecheck(t, a)
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| 158 | #define CALL_TYPECHECK_4(t, a, ...) \
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| 159 | CALL_TYPECHECK_3(__VA_ARGS__); \
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| 160 | typecheck(t, a)
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| 161 | #define CALL_TYPECHECK_5(t, a, ...) \
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| 162 | CALL_TYPECHECK_4(__VA_ARGS__); \
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| 163 | typecheck(t, a)
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| 164 |
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| 165 | #define CALL_PARM_0(...) void
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| 166 | #define CALL_PARM_1(t, a, ...) t
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| 167 | #define CALL_PARM_2(t, a, ...) t, CALL_PARM_1(__VA_ARGS__)
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| 168 | #define CALL_PARM_3(t, a, ...) t, CALL_PARM_2(__VA_ARGS__)
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| 169 | #define CALL_PARM_4(t, a, ...) t, CALL_PARM_3(__VA_ARGS__)
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| 170 | #define CALL_PARM_5(t, a, ...) t, CALL_PARM_4(__VA_ARGS__)
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| 171 | #define CALL_PARM_6(t, a, ...) t, CALL_PARM_5(__VA_ARGS__)
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| 172 |
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| 173 | |
| 174 | * Use call_on_stack() to call a function switching to a specified
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| 175 | * stack. Proper sign and zero extension of function arguments is
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| 176 | * done. Usage:
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| 177 | *
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| 178 | * rc = call_on_stack(nr, stack, rettype, fn, t1, a1, t2, a2, ...)
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| 179 | *
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| 180 | * - nr specifies the number of function arguments of fn.
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| 181 | * - stack specifies the stack to be used.
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| 182 | * - fn is the function to be called.
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| 183 | * - rettype is the return type of fn.
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| 184 | * - t1, a1, ... are pairs, where t1 must match the type of the first
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| 185 | * argument of fn, t2 the second, etc. a1 is the corresponding
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| 186 | * first function argument (not name), etc.
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| 187 |
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| 188 | #define call_on_stack(nr, stack, rettype, fn, ...) \
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| 189 | ({ \
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| 190 | rettype (*__fn)(CALL_PARM_##nr(__VA_ARGS__)) = fn; \
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| 191 | unsigned long frame = current_frame_address(); \
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| 192 | unsigned long __stack = stack; \
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| 193 | unsigned long prev; \
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| 194 | CALL_LARGS_##nr(__VA_ARGS__); \
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| 195 | CALL_REGS_##nr; \
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| 196 | \
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| 197 | CALL_TYPECHECK_##nr(__VA_ARGS__); \
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| 198 | asm volatile( \
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| 199 | " lgr %[_prev],15\n" \
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| 200 | " lg 15,%[_stack]\n" \
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| 201 | " stg %[_frame],%[_bc](15)\n" \
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| 202 | " brasl 14,%[_fn]\n" \
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| 203 | " lgr 15,%[_prev]" \
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| 204 | : [_prev] "=&d" (prev), CALL_FMT_##nr \
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| 205 | : [_stack] "R" (__stack), \
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| 206 | [_bc] "i" (offsetof(struct stack_frame, back_chain)), \
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| 207 | [_frame] "d" (frame), \
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| 208 | [_fn] "X" (__fn) : CALL_CLOBBER_##nr); \
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| 209 | (rettype)r2; \
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| 210 | })
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| 211 |
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| 212 | |
| 213 | * Use call_nodat() to call a function with DAT disabled.
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| 214 | * Proper sign and zero extension of function arguments is done.
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| 215 | * Usage:
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| 216 | *
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| 217 | * rc = call_nodat(nr, rettype, fn, t1, a1, t2, a2, ...)
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| 218 | *
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| 219 | * - nr specifies the number of function arguments of fn.
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| 220 | * - fn is the function to be called, where fn is a physical address.
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| 221 | * - rettype is the return type of fn.
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| 222 | * - t1, a1, ... are pairs, where t1 must match the type of the first
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| 223 | * argument of fn, t2 the second, etc. a1 is the corresponding
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| 224 | * first function argument (not name), etc.
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| 225 | *
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| 226 | * fn() is called with standard C function call ABI, with the exception
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| 227 | * that no useful stackframe or stackpointer is passed via register 15.
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| 228 | * Therefore the called function must not use r15 to access the stack.
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| 229 |
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| 230 | #define call_nodat(nr, rettype, fn, ...) \
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| 231 | ({ \
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| 232 | rettype (*__fn)(CALL_PARM_##nr(__VA_ARGS__)) = (fn); \
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| 233 | \
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| 234 | psw_t __aligned(16) psw_leave; \
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| 235 | psw_t psw_enter; \
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| 236 | CALL_LARGS_##nr(__VA_ARGS__); \
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| 237 | CALL_REGS_##nr; \
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| 238 | \
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| 239 | CALL_TYPECHECK_##nr(__VA_ARGS__); \
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| 240 | psw_enter.mask = PSW_KERNEL_BITS & ~PSW_MASK_DAT; \
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| 241 | psw_enter.addr = (unsigned long)__fn; \
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| 242 | asm volatile( \
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| 243 | " epsw 0,1\n" \
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| 244 | " risbg 1,0,0,31,32\n" \
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| 245 | " larl 7,1f\n" \
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| 246 | " stg 1,%[psw_leave]\n" \
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| 247 | " stg 7,8+%[psw_leave]\n" \
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| 248 | " la 7,%[psw_leave]\n" \
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| 249 | " lra 7,0(7)\n" \
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| 250 | " larl 1,0f\n" \
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| 251 | " lra 14,0(1)\n" \
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| 252 | " lpswe %[psw_enter]\n" \
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| 253 | "0: lpswe 0(7)\n" \
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| 254 | "1:" \
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| 255 | : CALL_FMT_##nr, [psw_leave] "=Q" (psw_leave) \
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| 256 | : [psw_enter] "Q" (psw_enter) \
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| 257 | : "7", CALL_CLOBBER_##nr); \
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| 258 | (rettype)r2; \
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| 259 | })
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| 260 |
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| 261 | #endif
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