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Diffstat (limited to 'arch/unicore32/lib/backtrace.S')
| -rw-r--r-- | arch/unicore32/lib/backtrace.S | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/arch/unicore32/lib/backtrace.S b/arch/unicore32/lib/backtrace.S deleted file mode 100644 index 6221944b81f3..000000000000 --- a/arch/unicore32/lib/backtrace.S +++ /dev/null @@ -1,168 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-only */ -/* - * linux/arch/unicore32/lib/backtrace.S - * - * Code specific to PKUnity SoC and UniCore ISA - * - * Copyright (C) 2001-2010 GUAN Xue-tao - */ -#include <linux/linkage.h> -#include <asm/assembler.h> - .text - -@ fp is 0 or stack frame - -#define frame v4 -#define sv_fp v5 -#define sv_pc v6 -#define offset v8 -#define loglvl v9 - -ENTRY(__backtrace) - mov r0, fp - -ENTRY(c_backtrace) - -#if !defined(CONFIG_FRAME_POINTER) || !defined(CONFIG_PRINTK) - mov pc, lr -ENDPROC(__backtrace) -ENDPROC(c_backtrace) -#else - stm.w (v4 - v10, lr), [sp-] @ Save an extra register - @ so we have a location... - mov.a frame, r0 @ if frame pointer is zero - beq no_frame @ we have no stack frames - mov loglvl, r1 - -1: stm.w (pc), [sp-] @ calculate offset of PC stored - ldw.w r0, [sp]+, #4 @ by stmfd for this CPU - adr r1, 1b - sub offset, r0, r1 - -/* - * Stack frame layout: - * optionally saved caller registers (r4 - r10) - * saved fp - * saved sp - * saved lr - * frame => saved pc - * optionally saved arguments (r0 - r3) - * saved sp => <next word> - * - * Functions start with the following code sequence: - * mov ip, sp - * stm.w (r0 - r3), [sp-] (optional) - * corrected pc => stm.w sp, (..., fp, ip, lr, pc) - */ -for_each_frame: - -1001: ldw sv_pc, [frame+], #0 @ get saved pc -1002: ldw sv_fp, [frame+], #-12 @ get saved fp - - sub sv_pc, sv_pc, offset @ Correct PC for prefetching - -1003: ldw r2, [sv_pc+], #-4 @ if stmfd sp, {args} exists, - ldw r3, .Ldsi+4 @ adjust saved 'pc' back one - cxor.a r3, r2 >> #14 @ instruction - beq 201f - sub r0, sv_pc, #4 @ allow for mov - b 202f -201: - sub r0, sv_pc, #8 @ allow for mov + stmia -202: - ldw r1, [frame+], #-4 @ get saved lr - mov r2, frame - b.l dump_backtrace_entry - - ldw r1, [sv_pc+], #-4 @ if stmfd sp, {args} exists, - ldw r3, .Ldsi+4 - cxor.a r3, r1 >> #14 - bne 1004f - ldw r0, [frame+], #-8 @ get sp - sub r0, r0, #4 @ point at the last arg - b.l .Ldumpstm @ dump saved registers - -1004: ldw r1, [sv_pc+], #0 @ if stmfd {, fp, ip, lr, pc} - ldw r3, .Ldsi @ instruction exists, - cxor.a r3, r1 >> #14 - bne 201f - sub r0, frame, #16 - b.l .Ldumpstm @ dump saved registers -201: - cxor.a sv_fp, #0 @ zero saved fp means - beq no_frame @ no further frames - - csub.a sv_fp, frame @ next frame must be - mov frame, sv_fp @ above the current frame - bua for_each_frame - -1006: adr r0, .Lbad - mov r1, loglvl - mov r2, frame - b.l printk -no_frame: ldm.w (v4 - v10, pc), [sp]+ -ENDPROC(__backtrace) -ENDPROC(c_backtrace) - - .pushsection __ex_table,"a" - .align 3 - .long 1001b, 1006b - .long 1002b, 1006b - .long 1003b, 1006b - .long 1004b, 1006b - .popsection - -#define instr v4 -#define reg v5 -#define stack v6 - -.Ldumpstm: stm.w (instr, reg, stack, v7, lr), [sp-] - mov stack, r0 - mov instr, r1 - mov reg, #14 - mov v7, #0 -1: mov r3, #1 - csub.a reg, #8 - bne 201f - sub reg, reg, #3 -201: - cand.a instr, r3 << reg - beq 2f - add v7, v7, #1 - cxor.a v7, #6 - cmoveq v7, #1 - bne 201f - adr r0, .Lcr - mov r1, loglvl - b.l printk -201: - ldw.w r3, [stack]+, #-4 - mov r2, reg - csub.a r2, #8 - bsl 201f - sub r2, r2, #3 -201: - cand.a instr, #0x40 @ if H is 1, high 16 regs - beq 201f - add r2, r2, #0x10 @ so r2 need add 16 -201: - adr r0, .Lfp - mov r1, loglvl - b.l printk -2: sub.a reg, reg, #1 - bns 1b - cxor.a v7, #0 - beq 201f - adr r0, .Lcr - mov r1, loglvl - b.l printk -201: ldm.w (instr, reg, stack, v7, pc), [sp]+ - -.Lfp: .asciz "%sr%d:%08x " -.Lcr: .asciz "%s\n" -.Lbad: .asciz "%sBacktrace aborted due to bad frame pointer <%p>\n" - .align -.Ldsi: .word 0x92eec000 >> 14 @ stm.w sp, (... fp, ip, lr, pc) - .word 0x92e10000 >> 14 @ stm.w sp, () - -#endif |