| /* | |
| * 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: | |
| pushl %ebp | |
| movl %esp, %ebp | |
| subl $8, %esp | |
| xorl %eax, %eax | |
| nop | |
| nop | |
| leave | |
| ret | |
| usdt_tracepoint_probe: | |
| _usdt_tracepoint_probe: | |
| nop | |
| nop | |
| nop | |
| nop | |
| nop | |
| addl $0x20,%esp | |
| leave | |
| usdt_tracepoint_end: | |
| _usdt_tracepoint_end: | |
| ret | |
| /* | |
| * Probe argument marshalling, i386 style | |
| * | |
| */ | |
| usdt_probe_args: | |
| _usdt_probe_args: | |
| pushl %ebp | |
| movl %esp,%ebp | |
| subl $8,%esp | |
| subl $8,%esp | |
| movl 8(%ebp),%edx | |
| movl 0xc(%ebp),%ecx | |
| test %ecx,%ecx | |
| je fire | |
| args: movl %ecx,%eax | |
| sal $2,%eax | |
| subl $4,%eax | |
| addl 0x10(%ebp),%eax | |
| pushl (%eax) | |
| dec %ecx | |
| jne args | |
| fire: jmp *%edx | |