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-rw-r--r--arch/sparc/mm/btfixup.c336
1 files changed, 336 insertions, 0 deletions
diff --git a/arch/sparc/mm/btfixup.c b/arch/sparc/mm/btfixup.c
new file mode 100644
index 000000000000..f147a44c9780
--- /dev/null
+++ b/arch/sparc/mm/btfixup.c
@@ -0,0 +1,336 @@
+/* $Id: btfixup.c,v 1.10 2000/05/09 17:40:13 davem Exp $
+ * btfixup.c: Boot time code fixup and relocator, so that
+ * we can get rid of most indirect calls to achieve single
+ * image sun4c and srmmu kernel.
+ *
+ * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <asm/btfixup.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/oplib.h>
+#include <asm/system.h>
+#include <asm/cacheflush.h>
+
+#define BTFIXUP_OPTIMIZE_NOP
+#define BTFIXUP_OPTIMIZE_OTHER
+
+extern char *srmmu_name;
+static char version[] __initdata = "Boot time fixup v1.6. 4/Mar/98 Jakub Jelinek (jj@ultra.linux.cz). Patching kernel for ";
+#ifdef CONFIG_SUN4
+static char str_sun4c[] __initdata = "sun4\n";
+#else
+static char str_sun4c[] __initdata = "sun4c\n";
+#endif
+static char str_srmmu[] __initdata = "srmmu[%s]/";
+static char str_iommu[] __initdata = "iommu\n";
+static char str_iounit[] __initdata = "io-unit\n";
+
+static int visited __initdata = 0;
+extern unsigned int ___btfixup_start[], ___btfixup_end[], __init_begin[], __init_end[], __init_text_end[];
+extern unsigned int _stext[], _end[], __start___ksymtab[], __stop___ksymtab[];
+static char wrong_f[] __initdata = "Trying to set f fixup %p to invalid function %08x\n";
+static char wrong_b[] __initdata = "Trying to set b fixup %p to invalid function %08x\n";
+static char wrong_s[] __initdata = "Trying to set s fixup %p to invalid value %08x\n";
+static char wrong_h[] __initdata = "Trying to set h fixup %p to invalid value %08x\n";
+static char wrong_a[] __initdata = "Trying to set a fixup %p to invalid value %08x\n";
+static char wrong[] __initdata = "Wrong address for %c fixup %p\n";
+static char insn_f[] __initdata = "Fixup f %p refers to weird instructions at %p[%08x,%08x]\n";
+static char insn_b[] __initdata = "Fixup b %p doesn't refer to a SETHI at %p[%08x]\n";
+static char insn_s[] __initdata = "Fixup s %p doesn't refer to an OR at %p[%08x]\n";
+static char insn_h[] __initdata = "Fixup h %p doesn't refer to a SETHI at %p[%08x]\n";
+static char insn_a[] __initdata = "Fixup a %p doesn't refer to a SETHI nor OR at %p[%08x]\n";
+static char insn_i[] __initdata = "Fixup i %p doesn't refer to a valid instruction at %p[%08x]\n";
+static char fca_und[] __initdata = "flush_cache_all undefined in btfixup()\n";
+static char wrong_setaddr[] __initdata = "Garbled CALL/INT patch at %p[%08x,%08x,%08x]=%08x\n";
+
+#ifdef BTFIXUP_OPTIMIZE_OTHER
+static void __init set_addr(unsigned int *addr, unsigned int q1, int fmangled, unsigned int value)
+{
+ if (!fmangled)
+ *addr = value;
+ else {
+ unsigned int *q = (unsigned int *)q1;
+ if (*addr == 0x01000000) {
+ /* Noped */
+ *q = value;
+ } else if (addr[-1] == *q) {
+ /* Moved */
+ addr[-1] = value;
+ *q = value;
+ } else {
+ prom_printf(wrong_setaddr, addr-1, addr[-1], *addr, *q, value);
+ prom_halt();
+ }
+ }
+}
+#else
+static __inline__ void set_addr(unsigned int *addr, unsigned int q1, int fmangled, unsigned int value)
+{
+ *addr = value;
+}
+#endif
+
+void __init btfixup(void)
+{
+ unsigned int *p, *q;
+ int type, count;
+ unsigned insn;
+ unsigned *addr;
+ int fmangled = 0;
+ void (*flush_cacheall)(void);
+
+ if (!visited) {
+ visited++;
+ printk(version);
+ if (ARCH_SUN4C_SUN4)
+ printk(str_sun4c);
+ else {
+ printk(str_srmmu, srmmu_name);
+ if (sparc_cpu_model == sun4d)
+ printk(str_iounit);
+ else
+ printk(str_iommu);
+ }
+ }
+ for (p = ___btfixup_start; p < ___btfixup_end; ) {
+ count = p[2];
+ q = p + 3;
+ switch (type = *(unsigned char *)p) {
+ case 'f':
+ count = p[3];
+ q = p + 4;
+ if (((p[0] & 1) || p[1])
+ && ((p[1] & 3) || (unsigned *)(p[1]) < _stext || (unsigned *)(p[1]) >= _end)) {
+ prom_printf(wrong_f, p, p[1]);
+ prom_halt();
+ }
+ break;
+ case 'b':
+ if (p[1] < (unsigned long)__init_begin || p[1] >= (unsigned long)__init_text_end || (p[1] & 3)) {
+ prom_printf(wrong_b, p, p[1]);
+ prom_halt();
+ }
+ break;
+ case 's':
+ if (p[1] + 0x1000 >= 0x2000) {
+ prom_printf(wrong_s, p, p[1]);
+ prom_halt();
+ }
+ break;
+ case 'h':
+ if (p[1] & 0x3ff) {
+ prom_printf(wrong_h, p, p[1]);
+ prom_halt();
+ }
+ break;
+ case 'a':
+ if (p[1] + 0x1000 >= 0x2000 && (p[1] & 0x3ff)) {
+ prom_printf(wrong_a, p, p[1]);
+ prom_halt();
+ }
+ break;
+ }
+ if (p[0] & 1) {
+ p[0] &= ~1;
+ while (count) {
+ fmangled = 0;
+ addr = (unsigned *)*q;
+ if (addr < _stext || addr >= _end) {
+ prom_printf(wrong, type, p);
+ prom_halt();
+ }
+ insn = *addr;
+#ifdef BTFIXUP_OPTIMIZE_OTHER
+ if (type != 'f' && q[1]) {
+ insn = *(unsigned int *)q[1];
+ if (!insn || insn == 1)
+ insn = *addr;
+ else
+ fmangled = 1;
+ }
+#endif
+ switch (type) {
+ case 'f': /* CALL */
+ if (addr >= __start___ksymtab && addr < __stop___ksymtab) {
+ *addr = p[1];
+ break;
+ } else if (!q[1]) {
+ if ((insn & 0xc1c00000) == 0x01000000) { /* SETHI */
+ *addr = (insn & 0xffc00000) | (p[1] >> 10); break;
+ } else if ((insn & 0xc1f82000) == 0x80102000) { /* OR X, %LO(i), Y */
+ *addr = (insn & 0xffffe000) | (p[1] & 0x3ff); break;
+ } else if ((insn & 0xc0000000) != 0x40000000) { /* !CALL */
+ bad_f:
+ prom_printf(insn_f, p, addr, insn, addr[1]);
+ prom_halt();
+ }
+ } else if (q[1] != 1)
+ addr[1] = q[1];
+ if (p[2] == BTFIXUPCALL_NORM) {
+ norm_f:
+ *addr = 0x40000000 | ((p[1] - (unsigned)addr) >> 2);
+ q[1] = 0;
+ break;
+ }
+#ifndef BTFIXUP_OPTIMIZE_NOP
+ goto norm_f;
+#else
+ if (!(addr[1] & 0x80000000)) {
+ if ((addr[1] & 0xc1c00000) != 0x01000000) /* !SETHI */
+ goto bad_f; /* CALL, Bicc, FBfcc, CBccc are weird in delay slot, aren't they? */
+ } else {
+ if ((addr[1] & 0x01800000) == 0x01800000) {
+ if ((addr[1] & 0x01f80000) == 0x01e80000) {
+ /* RESTORE */
+ goto norm_f; /* It is dangerous to patch that */
+ }
+ goto bad_f;
+ }
+ if ((addr[1] & 0xffffe003) == 0x9e03e000) {
+ /* ADD %O7, XX, %o7 */
+ int displac = (addr[1] << 19);
+
+ displac = (displac >> 21) + 2;
+ *addr = (0x10800000) + (displac & 0x3fffff);
+ q[1] = addr[1];
+ addr[1] = p[2];
+ break;
+ }
+ if ((addr[1] & 0x201f) == 0x200f || (addr[1] & 0x7c000) == 0x3c000)
+ goto norm_f; /* Someone is playing bad tricks with us: rs1 or rs2 is o7 */
+ if ((addr[1] & 0x3e000000) == 0x1e000000)
+ goto norm_f; /* rd is %o7. We'd better take care. */
+ }
+ if (p[2] == BTFIXUPCALL_NOP) {
+ *addr = 0x01000000;
+ q[1] = 1;
+ break;
+ }
+#ifndef BTFIXUP_OPTIMIZE_OTHER
+ goto norm_f;
+#else
+ if (addr[1] == 0x01000000) { /* NOP in the delay slot */
+ q[1] = addr[1];
+ *addr = p[2];
+ break;
+ }
+ if ((addr[1] & 0xc0000000) != 0xc0000000) {
+ /* Not a memory operation */
+ if ((addr[1] & 0x30000000) == 0x10000000) {
+ /* Ok, non-memory op with rd %oX */
+ if ((addr[1] & 0x3e000000) == 0x1c000000)
+ goto bad_f; /* Aiee. Someone is playing strange %sp tricks */
+ if ((addr[1] & 0x3e000000) > 0x12000000 ||
+ ((addr[1] & 0x3e000000) == 0x12000000 &&
+ p[2] != BTFIXUPCALL_STO1O0 && p[2] != BTFIXUPCALL_SWAPO0O1) ||
+ ((p[2] & 0xffffe000) == BTFIXUPCALL_RETINT(0))) {
+ /* Nobody uses the result. We can nop it out. */
+ *addr = p[2];
+ q[1] = addr[1];
+ addr[1] = 0x01000000;
+ break;
+ }
+ if ((addr[1] & 0xf1ffffe0) == 0x90100000) {
+ /* MOV %reg, %Ox */
+ if ((addr[1] & 0x3e000000) == 0x10000000 &&
+ (p[2] & 0x7c000) == 0x20000) {
+ /* Ok, it is call xx; mov reg, %o0 and call optimizes
+ to doing something on %o0. Patch the patch. */
+ *addr = (p[2] & ~0x7c000) | ((addr[1] & 0x1f) << 14);
+ q[1] = addr[1];
+ addr[1] = 0x01000000;
+ break;
+ }
+ if ((addr[1] & 0x3e000000) == 0x12000000 &&
+ p[2] == BTFIXUPCALL_STO1O0) {
+ *addr = (p[2] & ~0x3e000000) | ((addr[1] & 0x1f) << 25);
+ q[1] = addr[1];
+ addr[1] = 0x01000000;
+ break;
+ }
+ }
+ }
+ }
+ *addr = addr[1];
+ q[1] = addr[1];
+ addr[1] = p[2];
+ break;
+#endif /* BTFIXUP_OPTIMIZE_OTHER */
+#endif /* BTFIXUP_OPTIMIZE_NOP */
+ case 'b': /* BLACKBOX */
+ /* Has to be sethi i, xx */
+ if ((insn & 0xc1c00000) != 0x01000000) {
+ prom_printf(insn_b, p, addr, insn);
+ prom_halt();
+ } else {
+ void (*do_fixup)(unsigned *);
+
+ do_fixup = (void (*)(unsigned *))p[1];
+ do_fixup(addr);
+ }
+ break;
+ case 's': /* SIMM13 */
+ /* Has to be or %g0, i, xx */
+ if ((insn & 0xc1ffe000) != 0x80102000) {
+ prom_printf(insn_s, p, addr, insn);
+ prom_halt();
+ }
+ set_addr(addr, q[1], fmangled, (insn & 0xffffe000) | (p[1] & 0x1fff));
+ break;
+ case 'h': /* SETHI */
+ /* Has to be sethi i, xx */
+ if ((insn & 0xc1c00000) != 0x01000000) {
+ prom_printf(insn_h, p, addr, insn);
+ prom_halt();
+ }
+ set_addr(addr, q[1], fmangled, (insn & 0xffc00000) | (p[1] >> 10));
+ break;
+ case 'a': /* HALF */
+ /* Has to be sethi i, xx or or %g0, i, xx */
+ if ((insn & 0xc1c00000) != 0x01000000 &&
+ (insn & 0xc1ffe000) != 0x80102000) {
+ prom_printf(insn_a, p, addr, insn);
+ prom_halt();
+ }
+ if (p[1] & 0x3ff)
+ set_addr(addr, q[1], fmangled,
+ (insn & 0x3e000000) | 0x80102000 | (p[1] & 0x1fff));
+ else
+ set_addr(addr, q[1], fmangled,
+ (insn & 0x3e000000) | 0x01000000 | (p[1] >> 10));
+ break;
+ case 'i': /* INT */
+ if ((insn & 0xc1c00000) == 0x01000000) /* %HI */
+ set_addr(addr, q[1], fmangled, (insn & 0xffc00000) | (p[1] >> 10));
+ else if ((insn & 0x80002000) == 0x80002000 &&
+ (insn & 0x01800000) != 0x01800000) /* %LO */
+ set_addr(addr, q[1], fmangled, (insn & 0xffffe000) | (p[1] & 0x3ff));
+ else {
+ prom_printf(insn_i, p, addr, insn);
+ prom_halt();
+ }
+ break;
+ }
+ count -= 2;
+ q += 2;
+ }
+ } else
+ p = q + count;
+ }
+#ifdef CONFIG_SMP
+ flush_cacheall = (void (*)(void))BTFIXUPVAL_CALL(local_flush_cache_all);
+#else
+ flush_cacheall = (void (*)(void))BTFIXUPVAL_CALL(flush_cache_all);
+#endif
+ if (!flush_cacheall) {
+ prom_printf(fca_und);
+ prom_halt();
+ }
+ (*flush_cacheall)();
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.