xpcom/reflect/xptcall/src/md/unix/xptcinvoke_asm_mips.S@b8a032363ba2 (annotated)
xpcom/reflect/xptcall/src/md/unix/xptcinvoke_asm_mips.S
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* -*- Mode: asm; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| michael@0 | 2 | * Version: MPL 1.1 |
| michael@0 | 3 | * |
| michael@0 | 4 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 5 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 6 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 7 | |
| michael@0 | 8 | /* This code is for MIPS using the O32 ABI. */ |
| michael@0 | 9 | |
| michael@0 | 10 | #ifdef ANDROID |
| michael@0 | 11 | #include <asm/regdef.h> |
| michael@0 | 12 | #include <asm/asm.h> |
| michael@0 | 13 | #include <machine/asm.h> |
| michael@0 | 14 | #else |
| michael@0 | 15 | #include <sys/regdef.h> |
| michael@0 | 16 | #include <sys/asm.h> |
| michael@0 | 17 | #endif |
| michael@0 | 18 | |
| michael@0 | 19 | # NARGSAVE is the argument space in the callers frame, including extra |
| michael@0 | 20 | # 'shadowed' space for the argument registers. The minimum of 4 |
| michael@0 | 21 | # argument slots is sometimes predefined in the header files. |
| michael@0 | 22 | #ifndef NARGSAVE |
| michael@0 | 23 | #define NARGSAVE 4 |
| michael@0 | 24 | #endif |
| michael@0 | 25 | |
| michael@0 | 26 | #define LOCALSZ 3 /* gp, fp, ra */ |
| michael@0 | 27 | #define FRAMESZ ((((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK) |
| michael@0 | 28 | |
| michael@0 | 29 | #define RAOFF (FRAMESZ - (1*SZREG)) |
| michael@0 | 30 | #define FPOFF (FRAMESZ - (2*SZREG)) |
| michael@0 | 31 | #define GPOFF (FRAMESZ - (3*SZREG)) |
| michael@0 | 32 | |
| michael@0 | 33 | #define A0OFF (FRAMESZ + (0*SZREG)) |
| michael@0 | 34 | #define A1OFF (FRAMESZ + (1*SZREG)) |
| michael@0 | 35 | #define A2OFF (FRAMESZ + (2*SZREG)) |
| michael@0 | 36 | #define A3OFF (FRAMESZ + (3*SZREG)) |
| michael@0 | 37 | |
| michael@0 | 38 | .text |
| michael@0 | 39 | |
| michael@0 | 40 | # |
| michael@0 | 41 | # _NS_InvokeByIndex(that, methodIndex, paramCount, params) |
| michael@0 | 42 | # a0 a1 a2 a3 |
| michael@0 | 43 | |
| michael@0 | 44 | .globl _NS_InvokeByIndex |
| michael@0 | 45 | .align 2 |
| michael@0 | 46 | .type _NS_InvokeByIndex,@function |
| michael@0 | 47 | .ent _NS_InvokeByIndex,0 |
| michael@0 | 48 | .frame fp, FRAMESZ, ra |
| michael@0 | 49 | _NS_InvokeByIndex: |
| michael@0 | 50 | SETUP_GP |
| michael@0 | 51 | subu sp, FRAMESZ |
| michael@0 | 52 | |
| michael@0 | 53 | # specify the save register mask for gp, fp, ra, a3 - a0 |
| michael@0 | 54 | .mask 0xD00000F0, RAOFF-FRAMESZ |
| michael@0 | 55 | |
| michael@0 | 56 | sw ra, RAOFF(sp) |
| michael@0 | 57 | sw fp, FPOFF(sp) |
| michael@0 | 58 | |
| michael@0 | 59 | # we can't use .cprestore in a variable stack frame |
| michael@0 | 60 | sw gp, GPOFF(sp) |
| michael@0 | 61 | |
| michael@0 | 62 | sw a0, A0OFF(sp) |
| michael@0 | 63 | sw a1, A1OFF(sp) |
| michael@0 | 64 | sw a2, A2OFF(sp) |
| michael@0 | 65 | sw a3, A3OFF(sp) |
| michael@0 | 66 | |
| michael@0 | 67 | # save bottom of fixed frame |
| michael@0 | 68 | move fp, sp |
| michael@0 | 69 | |
| michael@0 | 70 | # extern "C" uint32 |
| michael@0 | 71 | # invoke_count_words(uint32_t paramCount, nsXPTCVariant* s); |
| michael@0 | 72 | la t9, invoke_count_words |
| michael@0 | 73 | move a0, a2 |
| michael@0 | 74 | move a1, a3 |
| michael@0 | 75 | jalr t9 |
| michael@0 | 76 | lw gp, GPOFF(fp) |
| michael@0 | 77 | |
| michael@0 | 78 | # allocate variable stack, with a size of: |
| michael@0 | 79 | # wordsize (of 4 bytes) * result (already aligned to dword) |
| michael@0 | 80 | # but a minimum of 16 byte |
| michael@0 | 81 | sll v0, 2 |
| michael@0 | 82 | slt t0, v0, 16 |
| michael@0 | 83 | beqz t0, 1f |
| michael@0 | 84 | li v0, 16 |
| michael@0 | 85 | 1: subu sp, v0 |
| michael@0 | 86 | |
| michael@0 | 87 | # let a0 point to the bottom of the variable stack, allocate |
| michael@0 | 88 | # another fixed stack for: |
| michael@0 | 89 | # extern "C" void |
| michael@0 | 90 | # invoke_copy_to_stack(uint32_t* d, uint32_t paramCount, |
| michael@0 | 91 | # nsXPTCVariant* s); |
| michael@0 | 92 | la t9, invoke_copy_to_stack |
| michael@0 | 93 | move a0, sp |
| michael@0 | 94 | lw a1, A2OFF(fp) |
| michael@0 | 95 | lw a2, A3OFF(fp) |
| michael@0 | 96 | subu sp, 16 |
| michael@0 | 97 | jalr t9 |
| michael@0 | 98 | lw gp, GPOFF(fp) |
| michael@0 | 99 | |
| michael@0 | 100 | # back to the variable stack frame |
| michael@0 | 101 | addu sp, 16 |
| michael@0 | 102 | |
| michael@0 | 103 | # calculate the function we need to jump to, which must then be |
| michael@0 | 104 | # stored in t9 |
| michael@0 | 105 | lw a0, A0OFF(fp) # a0 = set "that" to be "this" |
| michael@0 | 106 | lw t0, A1OFF(fp) # a1 = methodIndex |
| michael@0 | 107 | lw t9, 0(a0) |
| michael@0 | 108 | # t0 = methodIndex << PTRLOG |
| michael@0 | 109 | sll t0, t0, PTRLOG |
| michael@0 | 110 | addu t9, t0 |
| michael@0 | 111 | lw t9, (t9) |
| michael@0 | 112 | |
| michael@0 | 113 | # Set a1-a3 to what invoke_copy_to_stack told us. a0 is already |
| michael@0 | 114 | # the "this" pointer. We don't have to care about floating |
| michael@0 | 115 | # point arguments, the non-FP "this" pointer as first argument |
| michael@0 | 116 | # means they'll never be used. |
| michael@0 | 117 | lw a1, 1*SZREG(sp) |
| michael@0 | 118 | lw a2, 2*SZREG(sp) |
| michael@0 | 119 | lw a3, 3*SZREG(sp) |
| michael@0 | 120 | |
| michael@0 | 121 | jalr t9 |
| michael@0 | 122 | # Micro-optimization: There's no gp usage below this point, so |
| michael@0 | 123 | # we don't reload. |
| michael@0 | 124 | # lw gp, GPOFF(fp) |
| michael@0 | 125 | |
| michael@0 | 126 | # leave variable stack frame |
| michael@0 | 127 | move sp, fp |
| michael@0 | 128 | |
| michael@0 | 129 | lw ra, RAOFF(sp) |
| michael@0 | 130 | lw fp, FPOFF(sp) |
| michael@0 | 131 | |
| michael@0 | 132 | addiu sp, FRAMESZ |
| michael@0 | 133 | j ra |
| michael@0 | 134 | END(_NS_InvokeByIndex) |
