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1 | /* |
2 | Distributed under the Boost Software License, Version 1.0. | |
3 | (See accompanying file LICENSE_1_0.txt or copy at | |
4 | http://www.boost.org/LICENSE_1_0.txt) | |
5 | */ | |
6 | /******************************************************* | |
7 | * * | |
8 | * ------------------------------------------------- * | |
9 | * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | * | |
10 | * ------------------------------------------------- * | |
11 | * | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c| * | |
12 | * ------------------------------------------------- * | |
13 | * | fs0 | fs1 | fs2 | fs3 | * | |
14 | * ------------------------------------------------- * | |
15 | * ------------------------------------------------- * | |
16 | * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | * | |
17 | * ------------------------------------------------- * | |
18 | * | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| * | |
19 | * ------------------------------------------------- * | |
20 | * | fs4 | fs5 | fs6 | fs7 | * | |
21 | * ------------------------------------------------- * | |
22 | * ------------------------------------------------- * | |
23 | * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | * | |
24 | * ------------------------------------------------- * | |
25 | * | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c| * | |
26 | * ------------------------------------------------- * | |
27 | * | fs8 | fs9 | fs10 | fs11 | * | |
28 | * ------------------------------------------------- * | |
29 | * ------------------------------------------------- * | |
30 | * | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | * | |
31 | * ------------------------------------------------- * | |
32 | * | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c| * | |
33 | * ------------------------------------------------- * | |
34 | * | s0 | s1 | s2 | s3 | * | |
35 | * ------------------------------------------------- * | |
36 | * ------------------------------------------------- * | |
37 | * | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | * | |
38 | * ------------------------------------------------- * | |
39 | * | 0x80| 0x84| 0x88| 0x8c| 0x90| 0x94| 0x98| 0x9c| * | |
40 | * ------------------------------------------------- * | |
41 | * | s4 | s5 | s6 | s7 | * | |
42 | * ------------------------------------------------- * | |
43 | * ------------------------------------------------- * | |
44 | * | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | * | |
45 | * ------------------------------------------------- * | |
46 | * | 0xa0| 0xa4| 0xa8| 0xac| 0xb0| 0xb4| 0xb8| 0xbc| * | |
47 | * ------------------------------------------------- * | |
48 | * | s8 | s9 | s10 | s11 | * | |
49 | * ------------------------------------------------- * | |
50 | * ------------------------------------------------- * | |
51 | * | 48 | 49 | 50 | 51 | | | | | * | |
52 | * ------------------------------------------------- * | |
53 | * | 0xc0| 0xc4| 0xc8| 0xcc| | | | | * | |
54 | * ------------------------------------------------- * | |
55 | * | ra | pc | | | * | |
56 | * ------------------------------------------------- * | |
57 | * * | |
58 | *******************************************************/ | |
59 | ||
60 | .file "make_riscv64_sysv_elf_gas.S" | |
61 | .text | |
62 | .align 1 | |
63 | .global make_fcontext | |
64 | .type make_fcontext, %function | |
65 | make_fcontext: | |
66 | # shift address in a0 (allocated stack) to lower 16 byte boundary | |
67 | andi a0, a0, ~0xF | |
68 | ||
69 | # reserve space for context-data on context-stack | |
70 | addi a0, a0, -0xd0 | |
71 | ||
72 | # third arg of make_fcontext() == address of context-function | |
73 | # store address as a PC to jump in | |
74 | sd a2, 0xc8(a0) | |
75 | ||
76 | # save address of finish as return-address for context-function | |
77 | # will be entered after context-function returns (RA register) | |
f67539c2 | 78 | lla a4, finish |
92f5a8d4 TL |
79 | sd a4, 0xc0(a0) |
80 | ||
81 | ret // return pointer to context-data (a0) | |
82 | ||
83 | finish: | |
84 | # exit code is zero | |
85 | li a0, 0 | |
86 | # exit application | |
f67539c2 | 87 | tail _exit@plt |
92f5a8d4 TL |
88 | |
89 | .size make_fcontext,.-make_fcontext | |
90 | # Mark that we don't need executable stack. | |
91 | .section .note.GNU-stack,"",%progbits |