diff options
| author | Vineet Gupta <vgupta@synopsys.com> | 2018-06-06 20:20:37 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-23 16:35:16 +0300 |
| commit | 760884bcd3427a17a4b464c02a3d90f0043a9f9c (patch) | |
| tree | 07ba704f4726ea0f7f7216a0e098f4cf6008673e /arch/arc/include | |
| parent | f1e578427b8e923c9ba1e78fb1920129546adee5 (diff) | |
| download | linux-760884bcd3427a17a4b464c02a3d90f0043a9f9c.tar.xz | |
ARCv2: support manual regfile save on interrupts
[ Upstream commit e494239a007e601448110ac304fe055951f9de3b ]
There's a hardware bug which affects the HSDK platform, triggered by
micro-ops for auto-saving regfile on taken interrupt. The workaround is
to inhibit autosave.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/arc/include')
| -rw-r--r-- | arch/arc/include/asm/entry-arcv2.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/arc/include/asm/entry-arcv2.h b/arch/arc/include/asm/entry-arcv2.h index 257a68f3c2fe..9f581553dcc3 100644 --- a/arch/arc/include/asm/entry-arcv2.h +++ b/arch/arc/include/asm/entry-arcv2.h @@ -17,6 +17,33 @@ ; ; Now manually save: r12, sp, fp, gp, r25 +#ifdef CONFIG_ARC_IRQ_NO_AUTOSAVE +.ifnc \called_from, exception + st.as r9, [sp, -10] ; save r9 in it's final stack slot + sub sp, sp, 12 ; skip JLI, LDI, EI + + PUSH lp_count + PUSHAX lp_start + PUSHAX lp_end + PUSH blink + + PUSH r11 + PUSH r10 + + sub sp, sp, 4 ; skip r9 + + PUSH r8 + PUSH r7 + PUSH r6 + PUSH r5 + PUSH r4 + PUSH r3 + PUSH r2 + PUSH r1 + PUSH r0 +.endif +#endif + #ifdef CONFIG_ARC_HAS_ACCL_REGS PUSH r59 PUSH r58 @@ -86,6 +113,33 @@ POP r59 #endif +#ifdef CONFIG_ARC_IRQ_NO_AUTOSAVE +.ifnc \called_from, exception + POP r0 + POP r1 + POP r2 + POP r3 + POP r4 + POP r5 + POP r6 + POP r7 + POP r8 + POP r9 + POP r10 + POP r11 + + POP blink + POPAX lp_end + POPAX lp_start + + POP r9 + mov lp_count, r9 + + add sp, sp, 12 ; skip JLI, LDI, EI + ld.as r9, [sp, -10] ; reload r9 which got clobbered +.endif +#endif + .endm /*------------------------------------------------------------------------*/ |