83 lines
1.7 KiB
ArmAsm
83 lines
1.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* trampoline entry and return code for kretprobes.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/assembler.h>
|
|
|
|
.text
|
|
|
|
.macro save_all_base_regs
|
|
stp x0, x1, [sp, #S_X0]
|
|
stp x2, x3, [sp, #S_X2]
|
|
stp x4, x5, [sp, #S_X4]
|
|
stp x6, x7, [sp, #S_X6]
|
|
stp x8, x9, [sp, #S_X8]
|
|
stp x10, x11, [sp, #S_X10]
|
|
stp x12, x13, [sp, #S_X12]
|
|
stp x14, x15, [sp, #S_X14]
|
|
stp x16, x17, [sp, #S_X16]
|
|
stp x18, x19, [sp, #S_X18]
|
|
stp x20, x21, [sp, #S_X20]
|
|
stp x22, x23, [sp, #S_X22]
|
|
stp x24, x25, [sp, #S_X24]
|
|
stp x26, x27, [sp, #S_X26]
|
|
stp x28, x29, [sp, #S_X28]
|
|
add x0, sp, #PT_REGS_SIZE
|
|
stp lr, x0, [sp, #S_LR]
|
|
/*
|
|
* Construct a useful saved PSTATE
|
|
*/
|
|
mrs x0, nzcv
|
|
mrs x1, daif
|
|
orr x0, x0, x1
|
|
mrs x1, CurrentEL
|
|
orr x0, x0, x1
|
|
mrs x1, SPSel
|
|
orr x0, x0, x1
|
|
stp xzr, x0, [sp, #S_PC]
|
|
.endm
|
|
|
|
.macro restore_all_base_regs
|
|
ldr x0, [sp, #S_PSTATE]
|
|
and x0, x0, #(PSR_N_BIT | PSR_Z_BIT | PSR_C_BIT | PSR_V_BIT)
|
|
msr nzcv, x0
|
|
ldp x0, x1, [sp, #S_X0]
|
|
ldp x2, x3, [sp, #S_X2]
|
|
ldp x4, x5, [sp, #S_X4]
|
|
ldp x6, x7, [sp, #S_X6]
|
|
ldp x8, x9, [sp, #S_X8]
|
|
ldp x10, x11, [sp, #S_X10]
|
|
ldp x12, x13, [sp, #S_X12]
|
|
ldp x14, x15, [sp, #S_X14]
|
|
ldp x16, x17, [sp, #S_X16]
|
|
ldp x18, x19, [sp, #S_X18]
|
|
ldp x20, x21, [sp, #S_X20]
|
|
ldp x22, x23, [sp, #S_X22]
|
|
ldp x24, x25, [sp, #S_X24]
|
|
ldp x26, x27, [sp, #S_X26]
|
|
ldp x28, x29, [sp, #S_X28]
|
|
.endm
|
|
|
|
SYM_CODE_START(kretprobe_trampoline)
|
|
sub sp, sp, #PT_REGS_SIZE
|
|
|
|
save_all_base_regs
|
|
|
|
mov x0, sp
|
|
bl trampoline_probe_handler
|
|
/*
|
|
* Replace trampoline address in lr with actual orig_ret_addr return
|
|
* address.
|
|
*/
|
|
mov lr, x0
|
|
|
|
restore_all_base_regs
|
|
|
|
add sp, sp, #PT_REGS_SIZE
|
|
ret
|
|
|
|
SYM_CODE_END(kretprobe_trampoline)
|