projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | /* |
| 2 | Copyright Oliver Kowalke 2009. | |
| 3 | Distributed under the Boost Software License, Version 1.0. | |
| 4 | (See accompanying file LICENSE_1_0.txt or copy at | |
| 5 | http://www.boost.org/LICENSE_1_0.txt) | |
| 6 | */ | |
| 7 | ||
| 8 | /******************************************************* | |
| 9 | * * | |
| 10 | * ------------------------------------------------- * | |
| 11 | * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | * | |
| 12 | * ------------------------------------------------- * | |
| 13 | * | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | * | |
| 14 | * ------------------------------------------------- * | |
| 15 | * | S0 | S1 | S2 | S3 | S4 | S5 | S6 | S7 | * | |
| 16 | * ------------------------------------------------- * | |
| 17 | * ------------------------------------------------- * | |
| 18 | * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | * | |
| 19 | * ------------------------------------------------- * | |
| 20 | * | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | * | |
| 21 | * ------------------------------------------------- * | |
| 22 | * | FP |hiddn| RA | PC | GP | FCTX| DATA| | * | |
| 23 | * ------------------------------------------------- * | |
| 24 | * * | |
| 25 | * *****************************************************/ | |
| 26 | ||
| 27 | .text | |
| 28 | .globl jump_fcontext | |
| 29 | .align 2 | |
| 30 | .type jump_fcontext,@function | |
| 31 | .ent jump_fcontext | |
| 32 | jump_fcontext: | |
| 33 | # reserve space on stack | |
| 34 | addiu $sp, $sp, -112 | |
| 35 | ||
| 36 | sw $s0, ($sp) # save S0 | |
| 37 | sw $s1, 4($sp) # save S1 | |
| 38 | sw $s2, 8($sp) # save S2 | |
| 39 | sw $s3, 12($sp) # save S3 | |
| 40 | sw $s4, 16($sp) # save S4 | |
| 41 | sw $s5, 20($sp) # save S5 | |
| 42 | sw $s6, 24($sp) # save S6 | |
| 43 | sw $s7, 28($sp) # save S7 | |
| 44 | sw $fp, 32($sp) # save FP | |
| 45 | sw $a0, 36($sp) # save hidden, address of returned transfer_t | |
| 46 | sw $ra, 40($sp) # save RA | |
| 47 | sw $ra, 44($sp) # save RA as PC | |
| 48 | ||
| 49 | # store SP (pointing to context-data) in A0 | |
| 50 | move $a0, $sp | |
| 51 | ||
| 52 | # restore SP (pointing to context-data) from A1 | |
| 53 | move $sp, $a1 | |
| 54 | ||
| 55 | lw $s0, ($sp) # restore S0 | |
| 56 | lw $s1, 4($sp) # restore S1 | |
| 57 | lw $s2, 8($sp) # restore S2 | |
| 58 | lw $s3, 12($sp) # restore S3 | |
| 59 | lw $s4, 16($sp) # restore S4 | |
| 60 | lw $s5, 20($sp) # restore S5 | |
| 61 | lw $s6, 24($sp) # restore S6 | |
| 62 | lw $s7, 28($sp) # restore S7 | |
| 63 | lw $fp, 32($sp) # restore FP | |
| 64 | lw $t0, 36($sp) # restore hidden, address of returned transfer_t | |
| 65 | lw $ra, 40($sp) # restore RA | |
| 66 | ||
| 67 | # load PC | |
| 68 | lw $t9, 44($sp) | |
| 69 | ||
| 70 | # adjust stack | |
| 71 | addiu $sp, $sp, 112 | |
| 72 | ||
| 73 | # return transfer_t from jump | |
| 74 | sw $a0, ($t0) # fctx of transfer_t | |
| 75 | sw $a1, 4($t0) # data of transfer_t | |
| 76 | # pass transfer_t as first arg in context function | |
| 77 | # A0 == fctx, A1 == data | |
| 78 | move $a1, $a2 | |
| 79 | ||
| 80 | # jump to context | |
| 81 | jr $t9 | |
| 82 | .end jump_fcontext | |
| 83 | .size jump_fcontext, .-jump_fcontext | |
| 84 | ||
| 85 | /* Mark that we don't need executable stack. */ | |
| 86 | .section .note.GNU-stack,"",%progbits |