From 89a3927a775c0a7212e2e3c4e2d42cd48895bee0 Mon Sep 17 00:00:00 2001 From: Guo Ren Date: Tue, 18 Feb 2020 20:27:39 +0800 Subject: csky: Implement ftrace with regs This patch implements FTRACE_WITH_REGS for csky, which allows a traced function's arguments (and some other registers) to be captured into a struct pt_regs, allowing these to be inspected and/or modified. Signed-off-by: Guo Ren --- arch/csky/abiv2/inc/abi/entry.h | 60 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) (limited to 'arch/csky/abiv2/inc/abi/entry.h') diff --git a/arch/csky/abiv2/inc/abi/entry.h b/arch/csky/abiv2/inc/abi/entry.h index 94a7a58765df..6a404393d0f4 100644 --- a/arch/csky/abiv2/inc/abi/entry.h +++ b/arch/csky/abiv2/inc/abi/entry.h @@ -100,6 +100,66 @@ rte .endm +.macro SAVE_REGS_FTRACE + subi sp, 152 + stw tls, (sp, 0) + stw lr, (sp, 4) + + mfcr lr, psr + stw lr, (sp, 12) + + addi lr, sp, 152 + stw lr, (sp, 16) + + stw a0, (sp, 20) + stw a0, (sp, 24) + stw a1, (sp, 28) + stw a2, (sp, 32) + stw a3, (sp, 36) + + addi sp, 40 + stm r4-r13, (sp) + + addi sp, 40 + stm r16-r30, (sp) +#ifdef CONFIG_CPU_HAS_HILO + mfhi lr + stw lr, (sp, 60) + mflo lr + stw lr, (sp, 64) + mfcr lr, cr14 + stw lr, (sp, 68) +#endif + subi sp, 80 +.endm + +.macro RESTORE_REGS_FTRACE + ldw tls, (sp, 0) + ldw a0, (sp, 16) + mtcr a0, ss0 + +#ifdef CONFIG_CPU_HAS_HILO + ldw a0, (sp, 140) + mthi a0 + ldw a0, (sp, 144) + mtlo a0 + ldw a0, (sp, 148) + mtcr a0, cr14 +#endif + + ldw a0, (sp, 24) + ldw a1, (sp, 28) + ldw a2, (sp, 32) + ldw a3, (sp, 36) + + addi sp, 40 + ldm r4-r13, (sp) + addi sp, 40 + ldm r16-r30, (sp) + addi sp, 72 + mfcr sp, ss0 +.endm + .macro SAVE_SWITCH_STACK subi sp, 64 stm r4-r11, (sp) -- cgit