| 1 | /* Copyright (C) 2001-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <sysdep.h> |
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| 19 | #include <features.h> |
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| 20 | |
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| 21 | /* When a context set up by __makecontext() is activated, control |
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| 22 | transfers to __start_context. When we get here: |
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| 23 | |
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| 24 | b1 = entry point of function to call |
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| 25 | in0 = address of UCP to resume after function returns |
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| 26 | in1 = global pointer for __start_context |
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| 27 | out0 .. outN = arguments for function */ |
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| 28 | |
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| 29 | ENTRY(__start_context) |
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| 30 | .prologue |
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| 31 | alloc r2 = ar.pfs, 2, 0, 8, 0 |
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| 32 | |
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| 33 | .save rp, r4 // terminate call chain with a NULL rp |
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| 34 | mov r4 = r0 |
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| 35 | ;; |
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| 36 | |
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| 37 | .body |
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| 38 | br.call.sptk rp = b1 |
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| 39 | 1: |
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| 40 | mov gp = in1 // restore gp |
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| 41 | cmp.ne p6,p0 = in0, r0 // uc_link != 0 ? |
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| 42 | ;; |
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| 43 | (p6) mov out0 = in0 |
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| 44 | (p6) br.call.sptk rp = __setcontext |
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| 45 | .Lexit: |
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| 46 | mov out0 = 0 |
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| 47 | br.call.sptk rp = HIDDEN_JUMPTARGET(exit) |
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| 48 | |
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| 49 | 1: br.cond.sptk .Lexit |
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| 50 | END(__start_context) |
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| 51 | |
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