diff options
Diffstat (limited to 'exec/loader-armeabi.s')
| -rw-r--r-- | exec/loader-armeabi.s | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/exec/loader-armeabi.s b/exec/loader-armeabi.s new file mode 100644 index 00000000000..5601088262c --- /dev/null +++ b/exec/loader-armeabi.s @@ -0,0 +1,204 @@ +@ Copyright (C) 2023-2024 Free Software Foundation, Inc. +@ +@ This file is part of GNU Emacs. +@ +@ GNU Emacs is free software: you can redistribute it and/or modify +@ it under the terms of the GNU General Public License as published +@ by the Free Software Foundation, either version 3 of the License, +@ or (at your option) any later version. +@ +@ GNU Emacs is distributed in the hope that it will be useful, but +@ WITHOUT ANY WARRANTY; without even the implied warranty of +@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@ General Public License for more details. +@ +@ You should have received a copy of the GNU General Public License +@ along with GNU Emacs. If not, see <https:@www.gnu.org/licenses/>. + + .section .text + .global _start +_start: + @mov r7, #162 @ SYS_nanosleep + @adr r0, timespec @ req + @mov r1, #0 @ rem + @swi #0 @ syscall + mov r8, sp @ r8 = sp + ldr r9, [r8], #8 @ r9 = original sp, r8 += 8 + mov r14, #-1 @ r14 = secondary fd +.next_action: + ldr r11, [r8] @ r11 = action number + and r12, r11, #-17 @ actual action number + cmp r12, #0 @ open file? + beq .open_file @ open file. + cmp r12, #3 @ jump? + beq .rest_of_exec @ jump to code. + cmp r12, #4 @ anonymous mmap? + beq .do_mmap_anon @ anonymous mmap. +.do_mmap: + add r6, r8, #4 @ r6 = r8 + 4 + ldm r6!, {r0, r5} @ vm_address, file_offset + ldm r6!, {r1, r2} @ protection, length + mov r3, r1 @ swap + lsr r5, #12 @ divide file offset by page size + mov r1, r2 @ swap + mov r2, r3 @ swap + ldm r6!, {r3, r12} @ flags, clear + tst r11, #16 @ primary fd? + mov r4, r10 @ primary fd + beq .do_mmap_1 + mov r4, r14 @ secondary fd +.do_mmap_1: + mov r7, #192 @ SYS_mmap2 + swi #0 @ syscall + ldr r2, [r8, #4] @ vm_address + cmp r2, r0 @ rc == vm_address? + bne .perror + add r0, r1, r2 @ r0 = length + vm_address + sub r3, r0, r12 @ r3 = r0 - clear + mov r1, #0 @ r1 = 0 +.align: + cmp r0, r3 @ r0 == r3? + beq .continue @ continue + tst r3, #3 @ r3 & 3? + bne .fill32 @ fill aligned + strb r1, [r3], #1 @ fill byte + b .align @ align again +.fill32: + sub r2, r0, r3 @ r2 = r0 - r3 + cmp r2, #31 @ r2 >= 32? + ble .fillb @ start filling bytes + str r1, [r3], #4 @ *r3++ = 0 + str r1, [r3], #4 @ *r3++ = 0 + str r1, [r3], #4 @ *r3++ = 0 + str r1, [r3], #4 @ *r3++ = 0 + str r1, [r3], #4 @ *r3++ = 0 + str r1, [r3], #4 @ *r3++ = 0 + str r1, [r3], #4 @ *r3++ = 0 + str r1, [r3], #4 @ *r3++ = 0 + b .fill32 +.fillb: + cmp r0, r3 @ r0 == r3 + beq .continue @ done + strb r1, [r3], #1 @ ((char *) r3)++ = 0 + b .fillb +.continue: + add r8, r8, #28 @ next action + b .next_action +.do_mmap_anon: + add r6, r8, #4 @ r6 = r8 + 4 + ldm r6!, {r0, r5} @ vm_address, file_offset + ldm r6!, {r1, r2} @ protection, length + mov r3, r1 @ swap + lsr r5, #12 @ divide file offset by page size + mov r1, r2 @ swap + mov r2, r3 @ swap + ldm r6!, {r3, r12} @ flags, clear + mov r4, #-1 @ fd + b .do_mmap_1 +.open_file: + mov r7, #5 @ SYS_open + add r0, r8, #4 @ file name + mov r1, #0 @ O_RDONLY + mov r2, #0 @ mode + swi #0 @ syscall + cmp r0, #-1 @ r0 <= -1? + ble .perror + add r8, r8, #4 @ r8 = start of string + mov r1, r8 @ r1 = r8 +.nextc: + ldrb r2, [r8], #1 @ b = *r0++ + cmp r2, #47 @ dir separator? + bne .nextc1 @ not dir separator + mov r1, r8 @ r1 = char past separator +.nextc1: + cmp r2, #0 @ b? + bne .nextc @ next character + add r8, r8, #3 @ round up r8 + and r8, r8, #-4 @ mask for round, set r8 + tst r11, #16 @ primary fd? + bne .secondary @ secondary fd + mov r10, r0 @ primary fd + mov r7, #172 @ SYS_prctl + mov r0, #15 @ PR_SET_NAME, r1 = name + mov r2, #0 @ arg2 + mov r3, #0 @ arg3 + mov r4, #0 @ arg4 + mov r5, #0 @ arg5 + swi #0 @ syscall + b .next_action @ next action +.secondary: + mov r14, r0 @ secondary fd + b .next_action @ next action +.perror: + mov r7, #1 @ SYS_exit + mvn r0, r0 @ r0 = ~r0 + add r0, r0, #1 @ r0 += 1 + swi #0 +.rest_of_exec: + mov r7, r9 @ r7 = original SP + ldr r6, [r7] @ argc + add r6, r6, #2 @ argc + 2 + lsl r6, r6, #2 @ argc *= 4 + add r7, r7, r6 @ now past argv +.skipenv: + ldr r6, [r7], #4 @ r6 = *r7++ + cmp r6, #0 @ r6? + bne .skipenv @ r6? +.one_auxv: + ldr r6, [r7], #8 @ r6 = *r7, r7 += 2 + cmp r6, #0 @ !r6? + beq .cleanup @ r6? + cmp r6, #3 @ is AT_PHDR? + beq .replace_phdr @ replace + cmp r6, #4 @ is AT_PHENT? + beq .replace_phent @ replace + cmp r6, #5 @ is AT_PHNUM? + beq .replace_phnum @ replace + cmp r6, #9 @ is AT_ENTRY? + beq .replace_entry @ replace + cmp r6, #7 @ is AT_BASE? + beq .replace_base @ replace + b .one_auxv @ next auxv +.replace_phdr: + ldr r6, [r8, #20] @ at_phdr + str r6, [r7, #-4] @ store value + b .one_auxv +.replace_phent: + ldr r6, [r8, #12] @ at_phent + str r6, [r7, #-4] @ store value + b .one_auxv +.replace_phnum: + ldr r6, [r8, #16] @ at_phnum + str r6, [r7, #-4] @ store value + b .one_auxv +.replace_entry: + ldr r6, [r8, #8] @ at_entry + str r6, [r7, #-4] @ store value + b .one_auxv +.replace_base: + ldr r6, [r8, #24] @ at_base + str r6, [r7, #-4] @ store value + b .one_auxv +.cleanup: + cmp r14, #-1 @ secondary fd set? + bne .cleanup1 @ not set + mov r7, #6 @ SYS_close + mov r0, r14 @ secondary fd + swi #0 @ syscall +.cleanup1: + mov r7, #6 @ SYS_close + mov r0, r10 @ primary fd + swi #0 @ syscall +.enter: + mov sp, r9 @ restore original SP + mov r0, #0 @ clear rtld_fini + ldr r1, [r8, #4] @ branch to code + bx r1 + +timespec: + .long 10 + .long 10 + +@ Local Variables: +@ asm-comment-char: ?@ +@ End: |