On 8/18/23 05:56, pavel.koz...@synopsys.com wrote:
Hi Vineet,Subject: [PATCH 16/20] ARC: entry: Add more common chores to EXCEPTION_PROLOGUE THe high level structure of most ARC exception handlers is 1. save regfile with EXCEPTION_PROLOGUE 2. setup r0: EFA (not part of pt_regs) 3. setup r1: pointer to pt_regs (SP) 4. drop down to pure kernel mode (from exception) 5. call the Linux "C" handler Remove the boiler plate code by moving #2, #3, #4 into #1. The exceptions to most exceptions are syscall Trap and Machine check which don't do some of above for various reasons, so call a newly introduced variant EXCEPTION_PROLOGUE_KEEP_AE (same as original EXCEPTION_PROLOGUE)I'm observing the ARC700 (nSIM) system freeze after this patch. ... f0000000.serial: ttyS0 at MMIO 0xf0000000 (irq = 24, base_baud = 3125000) is a 16550A printk: console [ttyS0] enabled printk: console [ttyS0] enabled printk: bootconsole [uart8250] disabled printk: bootconsole [uart8250] disabled NET: Registered PF_PACKET protocol family NET: Registered PF_KEY protocol family clk: Disabling unused clocks Freeing unused kernel image (initmem) memory: 2856K This architecture does not have kernel memory protection. Run /init as init process@@ -128,11 +123,6 @@ ENTRY(EV_PrivilegeV) EXCEPTION_PROLOGUE - lr r0, [efa] - mov r1, sp - - FAKE_RET_FROM_EXCPN - bl do_privilege_fault b ret_from_exceptionThe same update is also required for the call_do_page_fault wrapper for ARcompact.
Indeed I missed that part. -Vineet _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
