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authorPaul Burton <paul.burton@mips.com>2018-08-10 16:03:31 -0700
committerPaul Burton <paul.burton@mips.com>2018-08-10 17:27:53 -0700
commit4bcb4ad6634ea1084faa630fe35d72f75b5e80fa (patch)
tree7e4f74cdf4222e45e91cf14cc22a67f261919730 /arch/mips/mm
parentb29fea3676033c48a1145b075b3e88c785271f70 (diff)
downloadlinux-4bcb4ad6634ea1084faa630fe35d72f75b5e80fa.tar.bz2
MIPS: Consistently declare TLB functions
Since at least the beginning of the git era we've declared our TLB exception handling functions inconsistently. They're actually functions, but we declare them as arrays of u32 where each u32 is an encoded instruction. This has always been the case for arch/mips/mm/tlbex.c, and has also been true for arch/mips/kernel/traps.c since commit 86a1708a9d54 ("MIPS: Make tlb exception handler definitions and declarations match.") which aimed for consistency but did so by consistently making the our C code inconsistent with our assembly. This is all usually harmless, but when using GCC 7 or newer to build a kernel targeting microMIPS (ie. CONFIG_CPU_MICROMIPS=y) it becomes problematic. With microMIPS bit 0 of the program counter indicates the ISA mode. When bit 0 is zero instructions are decoded using the standard MIPS32 or MIPS64 ISA. When bit 0 is one instructions are decoded using microMIPS. This means that function pointers become odd - their least significant bit is one for microMIPS code. We work around this in cases where we need to access code using loads & stores with our msk_isa16_mode() macro which simply clears bit 0 of the value it is given: #define msk_isa16_mode(x) ((x) & ~0x1) For example we do this for our TLB load handler in build_r4000_tlb_load_handler(): u32 *p = (u32 *)msk_isa16_mode((ulong)handle_tlbl); We then write code to p, expecting it to be suitably aligned (our LEAF macro aligns functions on 4 byte boundaries, so (ulong)handle_tlbl will give a value one greater than a multiple of 4 - ie. the start of a function on a 4 byte boundary, with the ISA mode bit 0 set). This worked fine up to GCC 6, but GCC 7 & onwards is smart enough to presume that handle_tlbl which we declared as an array of u32s must be aligned sufficiently that bit 0 of its address will never be set, and as a result optimize out msk_isa16_mode(). This leads to p having an address with bit 0 set, and when we go on to attempt to store code at that address we take an address error exception due to the unaligned memory access. This leads to an exception prior to the kernel having configured its own exception handlers, so we jump to whatever handlers the bootloader configured. In the case of QEMU this results in a silent hang, since it has no useful general exception vector. Fix this by consistently declaring our TLB-related functions as functions. For handle_tlbl(), handle_tlbs() & handle_tlbm() we do this in asm/tlbex.h & we make use of the existing declaration of tlbmiss_handler_setup_pgd() in asm/mmu_context.h. Our TLB handler generation code in arch/mips/mm/tlbex.c is adjusted to deal with these definitions, in most cases simply by casting the function pointers to u32 pointers. This allows us to include asm/mmu_context.h in arch/mips/mm/tlbex.c to get the definitions of tlbmiss_handler_setup_pgd & pgd_current, removing some needless duplication. Consistently using msk_isa16_mode() on function pointers means we no longer need the tlbmiss_handler_setup_pgd_start symbol so that is removed entirely. Now that we're declaring our functions as functions GCC stops optimizing out msk_isa16_mode() & a microMIPS kernel built with either GCC 7.3.0 or 8.1.0 boots successfully. Signed-off-by: Paul Burton <paul.burton@mips.com>
Diffstat (limited to 'arch/mips/mm')
-rw-r--r--arch/mips/mm/tlb-funcs.S1
-rw-r--r--arch/mips/mm/tlbex.c100
2 files changed, 40 insertions, 61 deletions
diff --git a/arch/mips/mm/tlb-funcs.S b/arch/mips/mm/tlb-funcs.S
index ae34361b6060..00fef578c8cd 100644
--- a/arch/mips/mm/tlb-funcs.S
+++ b/arch/mips/mm/tlb-funcs.S
@@ -17,7 +17,6 @@
#define FASTPATH_SIZE 128
-EXPORT(tlbmiss_handler_setup_pgd_start)
LEAF(tlbmiss_handler_setup_pgd)
1: j 1b /* Dummy, will be replaced. */
.space 64
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
index 2223620fb573..067714291643 100644
--- a/arch/mips/mm/tlbex.c
+++ b/arch/mips/mm/tlbex.c
@@ -31,6 +31,7 @@
#include <asm/cacheflush.h>
#include <asm/cpu-type.h>
+#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/war.h>
#include <asm/uasm.h>
@@ -253,8 +254,10 @@ static void output_pgtable_bits_defines(void)
pr_debug("\n");
}
-static inline void dump_handler(const char *symbol, const u32 *handler, int count)
+static inline void dump_handler(const char *symbol, const void *start, const void *end)
{
+ unsigned int count = (end - start) / sizeof(u32);
+ const u32 *handler = start;
int i;
pr_debug("LEAF(%s)\n", symbol);
@@ -402,12 +405,6 @@ static void build_restore_work_registers(u32 **p)
* CONFIG_MIPS_PGD_C0_CONTEXT implies 64 bit and lack of pgd_current,
* we cannot do r3000 under these circumstances.
*
- * Declare pgd_current here instead of including mmu_context.h to avoid type
- * conflicts for tlbmiss_handler_setup_pgd
- */
-extern unsigned long pgd_current[];
-
-/*
* The R3000 TLB handler is simple.
*/
static void build_r3000_tlb_refill_handler(void)
@@ -444,8 +441,7 @@ static void build_r3000_tlb_refill_handler(void)
memcpy((void *)ebase, tlb_handler, 0x80);
local_flush_icache_range(ebase, ebase + 0x80);
-
- dump_handler("r3000_tlb_refill", (u32 *)ebase, 32);
+ dump_handler("r3000_tlb_refill", (u32 *)ebase, (u32 *)(ebase + 0x80));
}
#endif /* CONFIG_MIPS_PGD_C0_CONTEXT */
@@ -1465,8 +1461,7 @@ static void build_r4000_tlb_refill_handler(void)
memcpy((void *)ebase, final_handler, 0x100);
local_flush_icache_range(ebase, ebase + 0x100);
-
- dump_handler("r4000_tlb_refill", (u32 *)ebase, 64);
+ dump_handler("r4000_tlb_refill", (u32 *)ebase, (u32 *)(ebase + 0x100));
}
static void setup_pw(void)
@@ -1568,30 +1563,21 @@ static void build_loongson3_tlb_refill_handler(void)
uasm_resolve_relocs(relocs, labels);
memcpy((void *)(ebase + 0x80), tlb_handler, 0x80);
local_flush_icache_range(ebase + 0x80, ebase + 0x100);
- dump_handler("loongson3_tlb_refill", (u32 *)(ebase + 0x80), 32);
+ dump_handler("loongson3_tlb_refill",
+ (u32 *)(ebase + 0x80), (u32 *)(ebase + 0x100));
}
-extern u32 handle_tlbl[], handle_tlbl_end[];
-extern u32 handle_tlbs[], handle_tlbs_end[];
-extern u32 handle_tlbm[], handle_tlbm_end[];
-extern u32 tlbmiss_handler_setup_pgd_start[];
-extern u32 tlbmiss_handler_setup_pgd[];
-extern u32 tlbmiss_handler_setup_pgd_end[];
-
static void build_setup_pgd(void)
{
const int a0 = 4;
const int __maybe_unused a1 = 5;
const int __maybe_unused a2 = 6;
- u32 *p = tlbmiss_handler_setup_pgd_start;
- const int tlbmiss_handler_setup_pgd_size =
- tlbmiss_handler_setup_pgd_end - tlbmiss_handler_setup_pgd_start;
+ u32 *p = (u32 *)msk_isa16_mode((ulong)tlbmiss_handler_setup_pgd);
#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
long pgdc = (long)pgd_current;
#endif
- memset(tlbmiss_handler_setup_pgd, 0, tlbmiss_handler_setup_pgd_size *
- sizeof(tlbmiss_handler_setup_pgd[0]));
+ memset(p, 0, tlbmiss_handler_setup_pgd_end - (char *)p);
memset(labels, 0, sizeof(labels));
memset(relocs, 0, sizeof(relocs));
pgd_reg = allocate_kscratch();
@@ -1644,15 +1630,15 @@ static void build_setup_pgd(void)
else
uasm_i_nop(&p);
#endif
- if (p >= tlbmiss_handler_setup_pgd_end)
+ if (p >= (u32 *)tlbmiss_handler_setup_pgd_end)
panic("tlbmiss_handler_setup_pgd space exceeded");
uasm_resolve_relocs(relocs, labels);
pr_debug("Wrote tlbmiss_handler_setup_pgd (%u instructions).\n",
- (unsigned int)(p - tlbmiss_handler_setup_pgd));
+ (unsigned int)(p - (u32 *)tlbmiss_handler_setup_pgd));
dump_handler("tlbmiss_handler", tlbmiss_handler_setup_pgd,
- tlbmiss_handler_setup_pgd_size);
+ tlbmiss_handler_setup_pgd_end);
}
static void
@@ -1921,12 +1907,11 @@ build_r3000_tlbchange_handler_head(u32 **p, unsigned int pte,
static void build_r3000_tlb_load_handler(void)
{
- u32 *p = handle_tlbl;
- const int handle_tlbl_size = handle_tlbl_end - handle_tlbl;
+ u32 *p = (u32 *)handle_tlbl;
struct uasm_label *l = labels;
struct uasm_reloc *r = relocs;
- memset(handle_tlbl, 0, handle_tlbl_size * sizeof(handle_tlbl[0]));
+ memset(p, 0, handle_tlbl_end - (char *)p);
memset(labels, 0, sizeof(labels));
memset(relocs, 0, sizeof(relocs));
@@ -1940,24 +1925,23 @@ static void build_r3000_tlb_load_handler(void)
uasm_i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff);
uasm_i_nop(&p);
- if (p >= handle_tlbl_end)
+ if (p >= (u32 *)handle_tlbl_end)
panic("TLB load handler fastpath space exceeded");
uasm_resolve_relocs(relocs, labels);
pr_debug("Wrote TLB load handler fastpath (%u instructions).\n",
- (unsigned int)(p - handle_tlbl));
+ (unsigned int)(p - (u32 *)handle_tlbl));
- dump_handler("r3000_tlb_load", handle_tlbl, handle_tlbl_size);
+ dump_handler("r3000_tlb_load", handle_tlbl, handle_tlbl_end);
}
static void build_r3000_tlb_store_handler(void)
{
- u32 *p = handle_tlbs;
- const int handle_tlbs_size = handle_tlbs_end - handle_tlbs;
+ u32 *p = (u32 *)handle_tlbs;
struct uasm_label *l = labels;
struct uasm_reloc *r = relocs;
- memset(handle_tlbs, 0, handle_tlbs_size * sizeof(handle_tlbs[0]));
+ memset(p, 0, handle_tlbs_end - (char *)p);
memset(labels, 0, sizeof(labels));
memset(relocs, 0, sizeof(relocs));
@@ -1971,24 +1955,23 @@ static void build_r3000_tlb_store_handler(void)
uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
uasm_i_nop(&p);
- if (p >= handle_tlbs_end)
+ if (p >= (u32 *)handle_tlbs_end)
panic("TLB store handler fastpath space exceeded");
uasm_resolve_relocs(relocs, labels);
pr_debug("Wrote TLB store handler fastpath (%u instructions).\n",
- (unsigned int)(p - handle_tlbs));
+ (unsigned int)(p - (u32 *)handle_tlbs));
- dump_handler("r3000_tlb_store", handle_tlbs, handle_tlbs_size);
+ dump_handler("r3000_tlb_store", handle_tlbs, handle_tlbs_end);
}
static void build_r3000_tlb_modify_handler(void)
{
- u32 *p = handle_tlbm;
- const int handle_tlbm_size = handle_tlbm_end - handle_tlbm;
+ u32 *p = (u32 *)handle_tlbm;
struct uasm_label *l = labels;
struct uasm_reloc *r = relocs;
- memset(handle_tlbm, 0, handle_tlbm_size * sizeof(handle_tlbm[0]));
+ memset(p, 0, handle_tlbm_end - (char *)p);
memset(labels, 0, sizeof(labels));
memset(relocs, 0, sizeof(relocs));
@@ -2002,14 +1985,14 @@ static void build_r3000_tlb_modify_handler(void)
uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
uasm_i_nop(&p);
- if (p >= handle_tlbm_end)
+ if (p >= (u32 *)handle_tlbm_end)
panic("TLB modify handler fastpath space exceeded");
uasm_resolve_relocs(relocs, labels);
pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n",
- (unsigned int)(p - handle_tlbm));
+ (unsigned int)(p - (u32 *)handle_tlbm));
- dump_handler("r3000_tlb_modify", handle_tlbm, handle_tlbm_size);
+ dump_handler("r3000_tlb_modify", handle_tlbm, handle_tlbm_end);
}
#endif /* CONFIG_MIPS_PGD_C0_CONTEXT */
@@ -2101,12 +2084,11 @@ build_r4000_tlbchange_handler_tail(u32 **p, struct uasm_label **l,
static void build_r4000_tlb_load_handler(void)
{
u32 *p = (u32 *)msk_isa16_mode((ulong)handle_tlbl);
- const int handle_tlbl_size = handle_tlbl_end - handle_tlbl;
struct uasm_label *l = labels;
struct uasm_reloc *r = relocs;
struct work_registers wr;
- memset(handle_tlbl, 0, handle_tlbl_size * sizeof(handle_tlbl[0]));
+ memset(p, 0, handle_tlbl_end - (char *)p);
memset(labels, 0, sizeof(labels));
memset(relocs, 0, sizeof(relocs));
@@ -2287,25 +2269,24 @@ static void build_r4000_tlb_load_handler(void)
uasm_i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff);
uasm_i_nop(&p);
- if (p >= handle_tlbl_end)
+ if (p >= (u32 *)handle_tlbl_end)
panic("TLB load handler fastpath space exceeded");
uasm_resolve_relocs(relocs, labels);
pr_debug("Wrote TLB load handler fastpath (%u instructions).\n",
- (unsigned int)(p - handle_tlbl));
+ (unsigned int)(p - (u32 *)handle_tlbl));
- dump_handler("r4000_tlb_load", handle_tlbl, handle_tlbl_size);
+ dump_handler("r4000_tlb_load", handle_tlbl, handle_tlbl_end);
}
static void build_r4000_tlb_store_handler(void)
{
u32 *p = (u32 *)msk_isa16_mode((ulong)handle_tlbs);
- const int handle_tlbs_size = handle_tlbs_end - handle_tlbs;
struct uasm_label *l = labels;
struct uasm_reloc *r = relocs;
struct work_registers wr;
- memset(handle_tlbs, 0, handle_tlbs_size * sizeof(handle_tlbs[0]));
+ memset(p, 0, handle_tlbs_end - (char *)p);
memset(labels, 0, sizeof(labels));
memset(relocs, 0, sizeof(relocs));
@@ -2342,25 +2323,24 @@ static void build_r4000_tlb_store_handler(void)
uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
uasm_i_nop(&p);
- if (p >= handle_tlbs_end)
+ if (p >= (u32 *)handle_tlbs_end)
panic("TLB store handler fastpath space exceeded");
uasm_resolve_relocs(relocs, labels);
pr_debug("Wrote TLB store handler fastpath (%u instructions).\n",
- (unsigned int)(p - handle_tlbs));
+ (unsigned int)(p - (u32 *)handle_tlbs));
- dump_handler("r4000_tlb_store", handle_tlbs, handle_tlbs_size);
+ dump_handler("r4000_tlb_store", handle_tlbs, handle_tlbs_end);
}
static void build_r4000_tlb_modify_handler(void)
{
u32 *p = (u32 *)msk_isa16_mode((ulong)handle_tlbm);
- const int handle_tlbm_size = handle_tlbm_end - handle_tlbm;
struct uasm_label *l = labels;
struct uasm_reloc *r = relocs;
struct work_registers wr;
- memset(handle_tlbm, 0, handle_tlbm_size * sizeof(handle_tlbm[0]));
+ memset(p, 0, handle_tlbm_end - (char *)p);
memset(labels, 0, sizeof(labels));
memset(relocs, 0, sizeof(relocs));
@@ -2398,14 +2378,14 @@ static void build_r4000_tlb_modify_handler(void)
uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
uasm_i_nop(&p);
- if (p >= handle_tlbm_end)
+ if (p >= (u32 *)handle_tlbm_end)
panic("TLB modify handler fastpath space exceeded");
uasm_resolve_relocs(relocs, labels);
pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n",
- (unsigned int)(p - handle_tlbm));
+ (unsigned int)(p - (u32 *)handle_tlbm));
- dump_handler("r4000_tlb_modify", handle_tlbm, handle_tlbm_size);
+ dump_handler("r4000_tlb_modify", handle_tlbm, handle_tlbm_end);
}
static void flush_tlb_handlers(void)