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| /*
| * Copyright (c) 2012, Chris Andrews. All rights reserved.
| */
|
| /*
| * Stub functions containing DTrace tracepoints for probes and
| * is-enabled probes. These functions are copied for each probe
| * dynamically created.
| *
| */
| .text
|
| .align 4, 0x90
| .globl usdt_tracepoint_isenabled
| .globl _usdt_tracepoint_isenabled
| .globl usdt_tracepoint_probe
| .globl _usdt_tracepoint_probe
| .globl usdt_tracepoint_end
| .globl _usdt_tracepoint_end
| .globl usdt_probe_args
| .globl _usdt_probe_args
|
| usdt_tracepoint_isenabled:
| _usdt_tracepoint_isenabled:
| pushq %rbp
| movq %rsp, %rbp
| addq $1, %rax
| xorq %rax, %rax
| nop
| nop
| leave
| ret
| usdt_tracepoint_probe:
| _usdt_tracepoint_probe:
| nop
| nop
| nop
| nop
| nop
| addq %r14,%rsp
| popq %rbx
| popq %r14
| popq %r13
| popq %r12
| leave
| usdt_tracepoint_end:
| _usdt_tracepoint_end:
| ret
|
| /*
| * Probe argument marshalling, x86_64 style
| *
| */
|
| usdt_probe_args:
| _usdt_probe_args:
| pushq %rbp
| movq %rsp,%rbp
| pushq %r12
| pushq %r13
| pushq %r14
| pushq %rbx
|
| movq %rdi,%r12
| movq %rsi,%rbx
| movq %rdx,%r11
| movq $0,%r14
|
| test %rbx,%rbx
| je fire
| movq (%r11),%rdi
| dec %rbx
| test %rbx,%rbx
| je fire
| addq $8,%r11
| movq (%r11),%rsi
| dec %rbx
| test %rbx,%rbx
| je fire
| addq $8,%r11
| movq (%r11),%rdx
| dec %rbx
| test %rbx,%rbx
| je fire
| addq $8,%r11
| movq (%r11),%rcx
| dec %rbx
| test %rbx,%rbx
| je fire
| addq $8,%r11
| movq (%r11),%r8
| dec %rbx
| test %rbx,%rbx
| je fire
| addq $8,%r11
| movq (%r11),%r9
|
| movq %rbx,%r13
| morestack:
| dec %rbx
| test %rbx,%rbx
| je args
| subq $16,%rsp
| addq $16,%r14
| dec %rbx
| test %rbx,%rbx
| je args
| jmp morestack
|
| args:
| movq %r13,%rbx
| movq $0,%r13
| moreargs:
| dec %rbx
| test %rbx,%rbx
| je fire
| addq $8,%r11
| movq (%r11),%rax
| movq %rax,(%rsp,%r13)
| addq $8,%r13
| jmp moreargs
|
| fire: jmp *%r12
|
|
