add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/xtensa/include/asm/processor.h
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@@ -10,9 +10,10 @@
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 #ifndef _XTENSA_PROCESSOR_H
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 #define _XTENSA_PROCESSOR_H
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-#include <variant/core.h>
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+#include <asm/core.h>
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 #include <linux/compiler.h>
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+#include <linux/stringify.h>
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 #include <asm/ptrace.h>
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 #include <asm/types.h>
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 #include <asm/regs.h>
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@@ -156,14 +157,6 @@
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 	int align[0] __attribute__ ((aligned(16)));
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 };
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-
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-/*
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- * Default implementation of macro that returns current
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- * instruction pointer ("program counter").
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- */
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-#define current_text_addr()  ({ __label__ _l; _l: &&_l;})
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-
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-
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 /* This decides where the kernel will search for a free chunk of vm
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  * space during mmap's.
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  */
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@@ -183,26 +176,37 @@
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 /*
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  * Do necessary setup to start up a newly executed thread.
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- * Note: We set-up ps as if we did a call4 to the new pc.
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+ * Note: When windowed ABI is used for userspace we set-up ps
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+ *       as if we did a call4 to the new pc.
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  *       set_thread_state in signal.c depends on it.
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  */
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-#define USER_PS_VALUE ((1 << PS_WOE_BIT) |				\
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+#if IS_ENABLED(CONFIG_USER_ABI_CALL0)
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+#define USER_PS_VALUE ((USER_RING << PS_RING_SHIFT) |			\
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+		       (1 << PS_UM_BIT) |				\
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+		       (1 << PS_EXCM_BIT))
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+#else
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+#define USER_PS_VALUE (PS_WOE_MASK |					\
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 		       (1 << PS_CALLINC_SHIFT) |			\
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 		       (USER_RING << PS_RING_SHIFT) |			\
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 		       (1 << PS_UM_BIT) |				\
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 		       (1 << PS_EXCM_BIT))
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+#endif
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 /* Clearing a0 terminates the backtrace. */
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 #define start_thread(regs, new_pc, new_sp) \
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-	memset(regs, 0, sizeof(*regs)); \
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-	regs->pc = new_pc; \
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-	regs->ps = USER_PS_VALUE; \
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-	regs->areg[1] = new_sp; \
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-	regs->areg[0] = 0; \
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-	regs->wmask = 1; \
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-	regs->depc = 0; \
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-	regs->windowbase = 0; \
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-	regs->windowstart = 1;
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+	do { \
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+		unsigned long syscall = (regs)->syscall; \
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+		memset((regs), 0, sizeof(*(regs))); \
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+		(regs)->pc = (new_pc); \
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+		(regs)->ps = USER_PS_VALUE; \
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+		(regs)->areg[1] = (new_sp); \
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+		(regs)->areg[0] = 0; \
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+		(regs)->wmask = 1; \
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+		(regs)->depc = 0; \
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+		(regs)->windowbase = 0; \
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+		(regs)->windowstart = 1; \
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+		(regs)->syscall = syscall; \
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+	} while (0)
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 /* Forward declaration */
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 struct task_struct;
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@@ -220,15 +224,18 @@
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 /* Special register access. */
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-#define WSR(v,sr) __asm__ __volatile__ ("wsr %0,"__stringify(sr) :: "a"(v));
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-#define RSR(v,sr) __asm__ __volatile__ ("rsr %0,"__stringify(sr) : "=a"(v));
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+#define xtensa_set_sr(x, sr) \
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+	({ \
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+	 __asm__ __volatile__ ("wsr %0, "__stringify(sr) :: \
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+			       "a"((unsigned int)(x))); \
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+	 })
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-#define set_sr(x,sr) ({unsigned int v=(unsigned int)x; WSR(v,sr);})
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-#define get_sr(sr) ({unsigned int v; RSR(v,sr); v; })
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-
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-#ifndef XCHAL_HAVE_EXTERN_REGS
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-#define XCHAL_HAVE_EXTERN_REGS 0
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-#endif
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+#define xtensa_get_sr(sr) \
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+	({ \
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+	 unsigned int v; \
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+	 __asm__ __volatile__ ("rsr %0, "__stringify(sr) : "=a"(v)); \
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+	 v; \
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+	 })
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 #if XCHAL_HAVE_EXTERN_REGS
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