mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2025-11-04 06:54:27 -05:00
1d45ed1477
Refreshed all patches. Remove upstreamed: - 049-v4.20-mips-remove-superfluous-check-for-linux.patch - 303-MIPS-Fix-bounds-check-virt_addr_valid.patch Fixes: - CVE-2019-3846 - CVE-2019-3900 Compile-tested on: cns3xxx Runtime-tested on: cns3xxx Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
511 lines
17 KiB
Diff
511 lines
17 KiB
Diff
--- a/arch/mips/include/asm/r4kcache.h
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+++ b/arch/mips/include/asm/r4kcache.h
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@@ -26,6 +26,38 @@
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extern void (*r4k_blast_dcache)(void);
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extern void (*r4k_blast_icache)(void);
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+#if defined(CONFIG_BCM47XX) && !defined(CONFIG_CPU_MIPS32_R2)
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+#include <asm/paccess.h>
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+#include <linux/ssb/ssb.h>
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+#define BCM4710_DUMMY_RREG() bcm4710_dummy_rreg()
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+
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+static inline unsigned long bcm4710_dummy_rreg(void)
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+{
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+ return *(volatile unsigned long *)(KSEG1ADDR(SSB_ENUM_BASE));
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+}
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+
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+#define BCM4710_FILL_TLB(addr) bcm4710_fill_tlb((void *)(addr))
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+
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+static inline unsigned long bcm4710_fill_tlb(void *addr)
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+{
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+ return *(unsigned long *)addr;
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+}
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+
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+#define BCM4710_PROTECTED_FILL_TLB(addr) bcm4710_protected_fill_tlb((void *)(addr))
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+
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+static inline void bcm4710_protected_fill_tlb(void *addr)
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+{
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+ unsigned long x;
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+ get_dbe(x, (unsigned long *)addr);;
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+}
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+
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+#else
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+#define BCM4710_DUMMY_RREG()
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+
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+#define BCM4710_FILL_TLB(addr)
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+#define BCM4710_PROTECTED_FILL_TLB(addr)
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+#endif
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+
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/*
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* This macro return a properly sign-extended address suitable as base address
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* for indexed cache operations. Two issues here:
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@@ -99,6 +131,7 @@ static inline void flush_icache_line_ind
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static inline void flush_dcache_line_indexed(unsigned long addr)
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{
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__dflush_prologue
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+ BCM4710_DUMMY_RREG();
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cache_op(Index_Writeback_Inv_D, addr);
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__dflush_epilogue
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}
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@@ -126,6 +159,7 @@ static inline void flush_icache_line(uns
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static inline void flush_dcache_line(unsigned long addr)
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{
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__dflush_prologue
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+ BCM4710_DUMMY_RREG();
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cache_op(Hit_Writeback_Inv_D, addr);
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__dflush_epilogue
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}
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@@ -133,6 +167,7 @@ static inline void flush_dcache_line(uns
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static inline void invalidate_dcache_line(unsigned long addr)
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{
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__dflush_prologue
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+ BCM4710_DUMMY_RREG();
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cache_op(Hit_Invalidate_D, addr);
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__dflush_epilogue
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}
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@@ -206,6 +241,7 @@ static inline int protected_flush_icache
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#ifdef CONFIG_EVA
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return protected_cachee_op(Hit_Invalidate_I, addr);
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#else
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+ BCM4710_DUMMY_RREG();
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return protected_cache_op(Hit_Invalidate_I, addr);
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#endif
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}
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@@ -219,6 +255,7 @@ static inline int protected_flush_icache
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*/
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static inline int protected_writeback_dcache_line(unsigned long addr)
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{
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+ BCM4710_DUMMY_RREG();
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#ifdef CONFIG_EVA
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return protected_cachee_op(Hit_Writeback_Inv_D, addr);
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#else
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@@ -576,8 +613,51 @@ static inline void invalidate_tcache_pag
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: "r" (base), \
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"i" (op));
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+static inline void blast_dcache(void)
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+{
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+ unsigned long start = KSEG0;
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+ unsigned long dcache_size = current_cpu_data.dcache.waysize * current_cpu_data.dcache.ways;
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+ unsigned long end = (start + dcache_size);
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+
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+ do {
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+ BCM4710_DUMMY_RREG();
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+ cache_op(Index_Writeback_Inv_D, start);
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+ start += current_cpu_data.dcache.linesz;
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+ } while(start < end);
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+}
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+
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+static inline void blast_dcache_page(unsigned long page)
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+{
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+ unsigned long start = page;
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+ unsigned long end = start + PAGE_SIZE;
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+
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+ BCM4710_FILL_TLB(start);
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+ do {
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+ BCM4710_DUMMY_RREG();
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+ cache_op(Hit_Writeback_Inv_D, start);
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+ start += current_cpu_data.dcache.linesz;
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+ } while(start < end);
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+}
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+
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+static inline void blast_dcache_page_indexed(unsigned long page)
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+{
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+ unsigned long start = page;
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+ unsigned long end = start + PAGE_SIZE;
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+ unsigned long ws_inc = 1UL << current_cpu_data.dcache.waybit;
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+ unsigned long ws_end = current_cpu_data.dcache.ways <<
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+ current_cpu_data.dcache.waybit;
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+ unsigned long ws, addr;
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+ for (ws = 0; ws < ws_end; ws += ws_inc) {
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+ start = page + ws;
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+ for (addr = start; addr < end; addr += current_cpu_data.dcache.linesz) {
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+ BCM4710_DUMMY_RREG();
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+ cache_op(Index_Writeback_Inv_D, addr);
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+ }
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+ }
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+}
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+
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/* build blast_xxx, blast_xxx_page, blast_xxx_page_indexed */
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-#define __BUILD_BLAST_CACHE(pfx, desc, indexop, hitop, lsize, extra) \
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+#define __BUILD_BLAST_CACHE(pfx, desc, indexop, hitop, lsize, extra, war) \
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static inline void extra##blast_##pfx##cache##lsize(void) \
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{ \
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unsigned long start = INDEX_BASE; \
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@@ -589,6 +669,7 @@ static inline void extra##blast_##pfx##c
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\
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__##pfx##flush_prologue \
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\
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+ war \
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for (ws = 0; ws < ws_end; ws += ws_inc) \
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for (addr = start; addr < end; addr += lsize * 32) \
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cache##lsize##_unroll32(addr|ws, indexop); \
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@@ -603,6 +684,7 @@ static inline void extra##blast_##pfx##c
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\
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__##pfx##flush_prologue \
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\
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+ war \
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do { \
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cache##lsize##_unroll32(start, hitop); \
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start += lsize * 32; \
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@@ -621,6 +703,8 @@ static inline void extra##blast_##pfx##c
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current_cpu_data.desc.waybit; \
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unsigned long ws, addr; \
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\
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+ war \
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+ \
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__##pfx##flush_prologue \
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\
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for (ws = 0; ws < ws_end; ws += ws_inc) \
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@@ -630,26 +714,26 @@ static inline void extra##blast_##pfx##c
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__##pfx##flush_epilogue \
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}
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-__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 16, )
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-__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 16, )
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-__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 16, )
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-__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 32, )
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-__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 32, )
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-__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I_Loongson2, 32, loongson2_)
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-__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 32, )
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-__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 64, )
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-__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 64, )
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-__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 64, )
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-__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 128, )
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-__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 128, )
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-__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 128, )
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-
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-__BUILD_BLAST_CACHE(inv_d, dcache, Index_Writeback_Inv_D, Hit_Invalidate_D, 16, )
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-__BUILD_BLAST_CACHE(inv_d, dcache, Index_Writeback_Inv_D, Hit_Invalidate_D, 32, )
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-__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 16, )
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-__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 32, )
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-__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 64, )
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-__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 128, )
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+__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 16, , )
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+__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 16, , BCM4710_FILL_TLB(start);)
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+__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 16, , )
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+__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 32, , )
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+__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 32, , BCM4710_FILL_TLB(start);)
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+__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I_Loongson2, 32, loongson2_, BCM4710_FILL_TLB(start);)
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+__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 32, , )
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+__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 64, , )
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+__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 64, , BCM4710_FILL_TLB(start);)
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+__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 64, , )
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+__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 128, , )
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+__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 128, , )
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+__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 128, , )
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+
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+__BUILD_BLAST_CACHE(inv_d, dcache, Index_Writeback_Inv_D, Hit_Invalidate_D, 16, , )
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+__BUILD_BLAST_CACHE(inv_d, dcache, Index_Writeback_Inv_D, Hit_Invalidate_D, 32, , )
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+__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 16, , )
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+__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 32, , )
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+__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 64, , )
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+__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 128, , )
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#define __BUILD_BLAST_USER_CACHE(pfx, desc, indexop, hitop, lsize) \
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static inline void blast_##pfx##cache##lsize##_user_page(unsigned long page) \
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@@ -678,53 +762,23 @@ __BUILD_BLAST_USER_CACHE(d, dcache, Inde
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__BUILD_BLAST_USER_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 64)
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/* build blast_xxx_range, protected_blast_xxx_range */
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-#define __BUILD_BLAST_CACHE_RANGE(pfx, desc, hitop, prot, extra) \
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+#define __BUILD_BLAST_CACHE_RANGE(pfx, desc, hitop, prot, extra, war, war2) \
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static inline void prot##extra##blast_##pfx##cache##_range(unsigned long start, \
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unsigned long end) \
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{ \
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unsigned long lsize = cpu_##desc##_line_size(); \
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- unsigned long lsize_2 = lsize * 2; \
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- unsigned long lsize_3 = lsize * 3; \
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- unsigned long lsize_4 = lsize * 4; \
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- unsigned long lsize_5 = lsize * 5; \
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- unsigned long lsize_6 = lsize * 6; \
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- unsigned long lsize_7 = lsize * 7; \
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- unsigned long lsize_8 = lsize * 8; \
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unsigned long addr = start & ~(lsize - 1); \
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- unsigned long aend = (end + lsize - 1) & ~(lsize - 1); \
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- int lines = (aend - addr) / lsize; \
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+ unsigned long aend = (end - 1) & ~(lsize - 1); \
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+ war \
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\
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__##pfx##flush_prologue \
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\
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- while (lines >= 8) { \
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- prot##cache_op(hitop, addr); \
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- prot##cache_op(hitop, addr + lsize); \
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- prot##cache_op(hitop, addr + lsize_2); \
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- prot##cache_op(hitop, addr + lsize_3); \
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- prot##cache_op(hitop, addr + lsize_4); \
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- prot##cache_op(hitop, addr + lsize_5); \
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- prot##cache_op(hitop, addr + lsize_6); \
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- prot##cache_op(hitop, addr + lsize_7); \
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- addr += lsize_8; \
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- lines -= 8; \
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- } \
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- \
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- if (lines & 0x4) { \
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- prot##cache_op(hitop, addr); \
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- prot##cache_op(hitop, addr + lsize); \
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- prot##cache_op(hitop, addr + lsize_2); \
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- prot##cache_op(hitop, addr + lsize_3); \
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- addr += lsize_4; \
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- } \
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- \
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- if (lines & 0x2) { \
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- prot##cache_op(hitop, addr); \
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- prot##cache_op(hitop, addr + lsize); \
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- addr += lsize_2; \
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- } \
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- \
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- if (lines & 0x1) { \
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+ while (1) { \
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+ war2 \
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prot##cache_op(hitop, addr); \
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+ if (addr == aend) \
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+ break; \
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+ addr += lsize; \
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} \
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\
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__##pfx##flush_epilogue \
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@@ -732,8 +786,8 @@ static inline void prot##extra##blast_##
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#ifndef CONFIG_EVA
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-__BUILD_BLAST_CACHE_RANGE(d, dcache, Hit_Writeback_Inv_D, protected_, )
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-__BUILD_BLAST_CACHE_RANGE(i, icache, Hit_Invalidate_I, protected_, )
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+__BUILD_BLAST_CACHE_RANGE(d, dcache, Hit_Writeback_Inv_D, protected_, , BCM4710_PROTECTED_FILL_TLB(addr); BCM4710_PROTECTED_FILL_TLB(aend);, BCM4710_DUMMY_RREG();)
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+__BUILD_BLAST_CACHE_RANGE(i, icache, Hit_Invalidate_I, protected_, , , )
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#else
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@@ -770,15 +824,15 @@ __BUILD_PROT_BLAST_CACHE_RANGE(d, dcache
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__BUILD_PROT_BLAST_CACHE_RANGE(i, icache, Hit_Invalidate_I)
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#endif
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-__BUILD_BLAST_CACHE_RANGE(s, scache, Hit_Writeback_Inv_SD, protected_, )
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+__BUILD_BLAST_CACHE_RANGE(s, scache, Hit_Writeback_Inv_SD, protected_, , , )
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__BUILD_BLAST_CACHE_RANGE(i, icache, Hit_Invalidate_I_Loongson2, \
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- protected_, loongson2_)
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-__BUILD_BLAST_CACHE_RANGE(d, dcache, Hit_Writeback_Inv_D, , )
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-__BUILD_BLAST_CACHE_RANGE(i, icache, Hit_Invalidate_I, , )
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-__BUILD_BLAST_CACHE_RANGE(s, scache, Hit_Writeback_Inv_SD, , )
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+ protected_, loongson2_, , )
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+__BUILD_BLAST_CACHE_RANGE(d, dcache, Hit_Writeback_Inv_D, , , BCM4710_FILL_TLB(addr); BCM4710_FILL_TLB(aend);, BCM4710_DUMMY_RREG();)
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+__BUILD_BLAST_CACHE_RANGE(i, icache, Hit_Invalidate_I, , , , )
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+__BUILD_BLAST_CACHE_RANGE(s, scache, Hit_Writeback_Inv_SD, , , , )
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/* blast_inv_dcache_range */
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-__BUILD_BLAST_CACHE_RANGE(inv_d, dcache, Hit_Invalidate_D, , )
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-__BUILD_BLAST_CACHE_RANGE(inv_s, scache, Hit_Invalidate_SD, , )
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+__BUILD_BLAST_CACHE_RANGE(inv_d, dcache, Hit_Invalidate_D, , , , BCM4710_DUMMY_RREG();)
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+__BUILD_BLAST_CACHE_RANGE(inv_s, scache, Hit_Invalidate_SD, , , , )
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/* Currently, this is very specific to Loongson-3 */
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#define __BUILD_BLAST_CACHE_NODE(pfx, desc, indexop, hitop, lsize) \
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--- a/arch/mips/include/asm/stackframe.h
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+++ b/arch/mips/include/asm/stackframe.h
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@@ -428,6 +428,10 @@
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eretnc
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#else
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.set arch=r4000
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+#ifdef CONFIG_BCM47XX
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+ nop
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+ nop
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+#endif
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eret
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.set mips0
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#endif
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--- a/arch/mips/kernel/genex.S
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+++ b/arch/mips/kernel/genex.S
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@@ -21,6 +21,19 @@
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#include <asm/war.h>
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#include <asm/thread_info.h>
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+#ifdef CONFIG_BCM47XX
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+# ifdef eret
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+# undef eret
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+# endif
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+# define eret \
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+ .set push; \
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+ .set noreorder; \
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+ nop; \
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+ nop; \
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+ eret; \
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+ .set pop;
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+#endif
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+
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__INIT
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/*
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@@ -32,6 +45,9 @@
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NESTED(except_vec3_generic, 0, sp)
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.set push
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.set noat
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+#ifdef CONFIG_BCM47XX
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+ nop
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+#endif
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#if R5432_CP0_INTERRUPT_WAR
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mfc0 k0, CP0_INDEX
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#endif
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@@ -55,6 +71,9 @@ NESTED(except_vec3_r4000, 0, sp)
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.set push
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.set arch=r4000
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.set noat
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+#ifdef CONFIG_BCM47XX
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+ nop
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+#endif
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mfc0 k1, CP0_CAUSE
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li k0, 31<<2
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andi k1, k1, 0x7c
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--- a/arch/mips/mm/c-r4k.c
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+++ b/arch/mips/mm/c-r4k.c
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@@ -39,6 +39,9 @@
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#include <asm/dma-coherence.h>
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#include <asm/mips-cps.h>
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+/* For enabling BCM4710 cache workarounds */
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+static int bcm4710 = 0;
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+
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/*
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* Bits describing what cache ops an SMP callback function may perform.
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*
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@@ -190,6 +193,9 @@ static void r4k_blast_dcache_user_page_s
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{
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unsigned long dc_lsize = cpu_dcache_line_size();
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+ if (bcm4710)
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+ r4k_blast_dcache_page = blast_dcache_page;
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+ else
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if (dc_lsize == 0)
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r4k_blast_dcache_user_page = (void *)cache_noop;
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else if (dc_lsize == 16)
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@@ -208,6 +214,9 @@ static void r4k_blast_dcache_page_indexe
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{
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unsigned long dc_lsize = cpu_dcache_line_size();
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+ if (bcm4710)
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+ r4k_blast_dcache_page_indexed = blast_dcache_page_indexed;
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+ else
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if (dc_lsize == 0)
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r4k_blast_dcache_page_indexed = (void *)cache_noop;
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else if (dc_lsize == 16)
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@@ -227,6 +236,9 @@ static void r4k_blast_dcache_setup(void)
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{
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unsigned long dc_lsize = cpu_dcache_line_size();
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+ if (bcm4710)
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+ r4k_blast_dcache = blast_dcache;
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+ else
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if (dc_lsize == 0)
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r4k_blast_dcache = (void *)cache_noop;
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else if (dc_lsize == 16)
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@@ -986,6 +998,8 @@ static void local_r4k_flush_cache_sigtra
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}
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R4600_HIT_CACHEOP_WAR_IMPL;
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+ BCM4710_PROTECTED_FILL_TLB(addr);
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+ BCM4710_PROTECTED_FILL_TLB(addr + 4);
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if (!cpu_has_ic_fills_f_dc) {
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if (dc_lsize)
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vaddr ? flush_dcache_line(addr & ~(dc_lsize - 1))
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@@ -1880,6 +1894,17 @@ static void coherency_setup(void)
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* silly idea of putting something else there ...
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*/
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switch (current_cpu_type()) {
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+ case CPU_BMIPS3300:
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+ {
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+ u32 cm;
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+ cm = read_c0_diag();
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+ /* Enable icache */
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+ cm |= (1 << 31);
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+ /* Enable dcache */
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+ cm |= (1 << 30);
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+ write_c0_diag(cm);
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+ }
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+ break;
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case CPU_R4000PC:
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case CPU_R4000SC:
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case CPU_R4000MC:
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@@ -1926,6 +1951,15 @@ void r4k_cache_init(void)
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extern void build_copy_page(void);
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struct cpuinfo_mips *c = ¤t_cpu_data;
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+ /* Check if special workarounds are required */
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+#if defined(CONFIG_BCM47XX) && !defined(CONFIG_CPU_MIPS32_R2)
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+ if (current_cpu_data.cputype == CPU_BMIPS32 && (current_cpu_data.processor_id & 0xff) == 0) {
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+ printk("Enabling BCM4710A0 cache workarounds.\n");
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+ bcm4710 = 1;
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+ } else
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+#endif
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+ bcm4710 = 0;
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+
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probe_pcache();
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probe_vcache();
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setup_scache();
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@@ -2004,7 +2038,15 @@ void r4k_cache_init(void)
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*/
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local_r4k___flush_cache_all(NULL);
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+#ifdef CONFIG_BCM47XX
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+ {
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+ static void (*_coherency_setup)(void);
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+ _coherency_setup = (void (*)(void)) KSEG1ADDR(coherency_setup);
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+ _coherency_setup();
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+ }
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+#else
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coherency_setup();
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+#endif
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board_cache_error_setup = r4k_cache_error_setup;
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/*
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--- a/arch/mips/mm/tlbex.c
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+++ b/arch/mips/mm/tlbex.c
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@@ -976,6 +976,9 @@ void build_get_pgde32(u32 **p, unsigned
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uasm_i_srl(p, ptr, ptr, SMP_CPUID_PTRSHIFT);
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uasm_i_addu(p, ptr, tmp, ptr);
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#else
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+#ifdef CONFIG_BCM47XX
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+ uasm_i_nop(p);
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+#endif
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UASM_i_LA_mostly(p, ptr, pgdc);
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#endif
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uasm_i_mfc0(p, tmp, C0_BADVADDR); /* get faulting address */
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@@ -1337,6 +1340,9 @@ static void build_r4000_tlb_refill_handl
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#ifdef CONFIG_64BIT
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build_get_pmde64(&p, &l, &r, K0, K1); /* get pmd in K1 */
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#else
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+# ifdef CONFIG_BCM47XX
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+ uasm_i_nop(&p);
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+# endif
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build_get_pgde32(&p, K0, K1); /* get pgd in K1 */
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#endif
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@@ -1348,6 +1354,9 @@ static void build_r4000_tlb_refill_handl
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build_update_entries(&p, K0, K1);
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build_tlb_write_entry(&p, &l, &r, tlb_random);
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uasm_l_leave(&l, p);
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+#ifdef CONFIG_BCM47XX
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+ uasm_i_nop(&p);
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+#endif
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uasm_i_eret(&p); /* return from trap */
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}
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#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
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@@ -2057,6 +2066,9 @@ build_r4000_tlbchange_handler_head(u32 *
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#ifdef CONFIG_64BIT
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build_get_pmde64(p, l, r, wr.r1, wr.r2); /* get pmd in ptr */
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#else
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+# ifdef CONFIG_BCM47XX
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+ uasm_i_nop(p);
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+# endif
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build_get_pgde32(p, wr.r1, wr.r2); /* get pgd in ptr */
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#endif
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@@ -2103,6 +2115,9 @@ build_r4000_tlbchange_handler_tail(u32 *
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build_tlb_write_entry(p, l, r, tlb_indexed);
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uasm_l_leave(l, *p);
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build_restore_work_registers(p);
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+#ifdef CONFIG_BCM47XX
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+ uasm_i_nop(p);
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+#endif
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uasm_i_eret(p); /* return from trap */
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#ifdef CONFIG_64BIT
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