Lines Matching +full:bl +full:- +full:code +full:- +full:offset

1 /* SPDX-License-Identifier: GPL-2.0-only */
3  *  linux/arch/arm/lib/backtrace-clang.S
39  * If the call instruction was a bl we can look at the callers branch
45  * Unfortunately due to the stack frame layout we can't dump r0 - r3, but these
52  * 		optionally saved caller registers (r4 - r10)
53  * 		optionally saved arguments (r0 - r3)
57  * Functions start with the following code sequence:
60  *		stmfd sp!, {r0 - r3} (optional)
69  * The frame for c_backtrace has pointers to the code of dump_stack. This is
82  * show_stack. It points at the instruction directly after the bl dump_stack.
83  * We can then read the offset from the bl opcode to determine where the branch
88  * {[FP]    }  =======|    |   bl c_backtrace
90  * {[R4-R10]}         |
91  * {[R0-R3] }         |        show_stack:
93  * {[LR]    } =============|   bl dump_stack
95  * {[R4-R10]}
96  * {[R0-R3] }
99 		stmfd	sp!, {r4 - r9, fp, lr}	@ Save an extra register
104 		tst	r1, #0x10		@ 26 or 32-bit mode?
106 		movne	mask, #0		@ mask for 32-bit
119  * sv_pc is the saved lr frame the frame above. This is a pointer to a code
132  * a pointer to a code address in the current function's caller.  sv_lr-4 is
136  * called using a bl instruction. If the function start can be recovered sv_pc
147 1004:		ldr	r0, [sv_lr, #-4]	@ get call instruction
149 		and	r2, r3, r0		@ is this a bl call
152 		and	r0, #0xffffff		@ get call offset 24-bit int
153 		lsl	r0, r0, #8		@ sign extend offset
156 		add	sv_pc, sv_pc, #-4	@ get call instruction address
173 		bl	dump_backtrace_entry
213 		bl	_printk
214 no_frame:	ldmfd	sp!, {r4 - r9, fp, pc}
228 		.word	0x0b000000		@ bl if these bits are set