1/* libunwind - a platform-independent unwind library 2 Copyright (C) 2008 Google, Inc 3 Contributed by Paul Pluzhnikov <ppluzhnikov@google.com> 4 Copyright (C) 2010 Konstantin Belousov <kib@freebsd.org> 5 Copyright (C) 2017 IBM 6 7 Modified for s390x by Michael Munday <mike.munday@ibm.com> 8 9This file is part of libunwind. 10 11Permission is hereby granted, free of charge, to any person obtaining 12a copy of this software and associated documentation files (the 13"Software"), to deal in the Software without restriction, including 14without limitation the rights to use, copy, modify, merge, publish, 15distribute, sublicense, and/or sell copies of the Software, and to 16permit persons to whom the Software is furnished to do so, subject to 17the following conditions: 18 19The above copyright notice and this permission notice shall be 20included in all copies or substantial portions of the Software. 21 22THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 23EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 24MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 25NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 26LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 27OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 28WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 29 30// int _Us390x_setcontext (const ucontext_t *ucp) 31 32 .global _Us390x_setcontext 33 .type _Us390x_setcontext, @function 34_Us390x_setcontext: 35 .cfi_startproc 36 37 // Must only restore registers saved by getcontext, other fields 38 // in the ucontext_t might be uninitialised. 39 40 // Stop this function being unwound. We are clobbering callee-save 41 // registers in this function so unwinding it is unsafe. 42 // Ideally we'd save callee-save registers, update the CFI for them 43 // and then switch to the new CFI once the context switch is 44 // complete. 45 .cfi_undefined %r14 46 47 // floating point parameters 48 ld %f0,0x100(%r2) 49 ld %f2,0x110(%r2) 50 ld %f4,0x120(%r2) 51 ld %f6,0x130(%r2) 52 53 // floating point preserved registers 54 lfpc 0xf8(%r2) 55 ld %f8,0x140(%r2) 56 ld %f9,0x148(%r2) 57 ld %f10,0x150(%r2) 58 ld %f11,0x158(%r2) 59 ld %f12,0x160(%r2) 60 ld %f13,0x168(%r2) 61 ld %f14,0x170(%r2) 62 ld %f15,0x178(%r2) 63 64 // preserved registers and parameters 65 lgr %r1,%r2 66 lmg %r2,%r15,0x48(%r1) 67 68 // restore PSW address 69 lg %r1,0x30(%r1) 70 br %r1 71 72 .cfi_endproc 73 .size _Us390x_setcontext, . - _Us390x_setcontext 74 75 // We do not need executable stack. 76 .section .note.GNU-stack,"",@progbits 77