Add branch alias test
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>branch-alias
Anton Blanchard
parent
2562053af3
commit
25f93fc17e
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TEST=branch_alias
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include ../Makefile.test
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#include <stddef.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "console.h"
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#define MSR_LE 0x1
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#define MSR_DR 0x10
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#define MSR_IR 0x20
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#define MSR_SF 0x8000000000000000ul
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extern unsigned long callit(unsigned long arg1, unsigned long arg2,
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unsigned long fn, unsigned long msr);
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static inline void do_tlbie(unsigned long rb, unsigned long rs)
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{
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__asm__ volatile("tlbie %0,%1" : : "r" (rb), "r" (rs) : "memory");
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}
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#define SRR0 26
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#define SRR1 27
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#define PID 48
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#define SPRG0 272
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#define SPRG1 273
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#define PTCR 464
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static inline unsigned long mfspr(int sprnum)
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{
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long val;
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__asm__ volatile("mfspr %0,%1" : "=r" (val) : "i" (sprnum));
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return val;
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}
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static inline void mtspr(int sprnum, unsigned long val)
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{
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__asm__ volatile("mtspr %0,%1" : : "i" (sprnum), "r" (val));
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}
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static inline void store_pte(unsigned long *p, unsigned long pte)
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{
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__asm__ volatile("stdbrx %1,0,%0" : : "r" (p), "r" (pte) : "memory");
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}
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void print_string(const char *str)
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{
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for (; *str; ++str)
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putchar(*str);
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}
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void print_hex(unsigned long val, int ndigit)
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{
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int i, x;
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for (i = (ndigit - 1) * 4; i >= 0; i -= 4) {
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x = (val >> i) & 0xf;
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if (x >= 10)
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putchar(x + 'a' - 10);
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else
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putchar(x + '0');
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}
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}
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// i < 100
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void print_test_number(int i)
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{
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print_string("test ");
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putchar(48 + i/10);
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putchar(48 + i%10);
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putchar(':');
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}
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#define CACHE_LINE_SIZE 64
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void zero_memory(void *ptr, unsigned long nbytes)
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{
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unsigned long nb, i, nl;
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void *p;
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for (; nbytes != 0; nbytes -= nb, ptr += nb) {
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nb = -((unsigned long)ptr) & (CACHE_LINE_SIZE - 1);
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if (nb == 0 && nbytes >= CACHE_LINE_SIZE) {
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nl = nbytes / CACHE_LINE_SIZE;
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p = ptr;
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for (i = 0; i < nl; ++i) {
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__asm__ volatile("dcbz 0,%0" : : "r" (p) : "memory");
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p += CACHE_LINE_SIZE;
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}
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nb = nl * CACHE_LINE_SIZE;
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} else {
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if (nb > nbytes)
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nb = nbytes;
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for (i = 0; i < nb; ++i)
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((unsigned char *)ptr)[i] = 0;
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}
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}
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}
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#define PERM_EX 0x001
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#define PERM_WR 0x002
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#define PERM_RD 0x004
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#define PERM_PRIV 0x008
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#define ATTR_NC 0x020
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#define CHG 0x080
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#define REF 0x100
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#define DFLT_PERM (PERM_EX | PERM_WR | PERM_RD | REF | CHG)
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/*
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* Set up an MMU translation tree using memory starting at the 64k point.
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* We use 3 levels, mapping 512GB, with 4kB PGD/PMD/PTE pages.
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*/
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unsigned long *part_tbl = (unsigned long *) 0x10000;
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unsigned long *proc_tbl = (unsigned long *) 0x11000;
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unsigned long *pgdir = (unsigned long *) 0x12000;
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unsigned long free_ptr = 0x13000;
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void init_mmu(void)
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{
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/* set up partition table */
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store_pte(&part_tbl[1], (unsigned long)proc_tbl);
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/* set up process table */
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zero_memory(proc_tbl, 512 * sizeof(unsigned long));
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mtspr(PTCR, (unsigned long)part_tbl);
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mtspr(PID, 1);
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zero_memory(pgdir, 512 * sizeof(unsigned long));
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/* RTS = 8 (512GB address space), RPDS = 9 (512-entry top level) */
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store_pte(&proc_tbl[2 * 1], (unsigned long) pgdir | 0x2000000000000009);
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do_tlbie(0xc00, 0); /* invalidate all TLB entries */
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}
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static unsigned long *read_pd(unsigned long *pdp, unsigned long i)
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{
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unsigned long ret;
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__asm__ volatile("ldbrx %0,%1,%2" : "=r" (ret) : "b" (pdp),
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"r" (i * sizeof(unsigned long)));
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return (unsigned long *) (ret & 0x00ffffffffffff00);
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}
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void map(unsigned long ea, unsigned long pa, unsigned long perm_attr)
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{
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unsigned long epn = ea >> 12;
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unsigned long h, i, j;
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unsigned long *ptep;
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unsigned long *pmdp;
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h = (epn >> 18) & 0x1ff;
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i = (epn >> 9) & 0x1ff;
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j = epn & 0x1ff;
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if (pgdir[h] == 0) {
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zero_memory((void *)free_ptr, 512 * sizeof(unsigned long));
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store_pte(&pgdir[h], 0x8000000000000000 | free_ptr | 9);
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free_ptr += 512 * sizeof(unsigned long);
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}
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pmdp = read_pd(pgdir, h);
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if (pmdp[i] == 0) {
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zero_memory((void *)free_ptr, 512 * sizeof(unsigned long));
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store_pte(&pmdp[i], 0x8000000000000000 | free_ptr | 9);
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free_ptr += 512 * sizeof(unsigned long);
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}
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ptep = read_pd(pmdp, i);
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if (ptep[j]) {
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ptep[j] = 0;
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do_tlbie(ea & ~0xfff, 0);
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}
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store_pte(&ptep[j], 0xc000000000000000 | (pa & 0x00fffffffffff000) |
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perm_attr);
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}
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void unmap(void *ea)
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{
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unsigned long epn = (unsigned long) ea >> 12;
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unsigned long h, i, j;
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unsigned long *ptep, *pmdp;
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h = (epn >> 18) & 0x1ff;
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i = (epn >> 9) & 0x1ff;
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j = epn & 0x1ff;
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if (pgdir[h] == 0)
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return;
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pmdp = read_pd(pgdir, h);
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if (pmdp[i] == 0)
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return;
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ptep = read_pd(pmdp, i);
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ptep[j] = 0;
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do_tlbie(((unsigned long)ea & ~0xfff), 0);
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}
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extern unsigned long test_code(unsigned long sel, unsigned long addr);
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int mode_test_1(void)
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{
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unsigned long ret, msr;
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map(0, (unsigned long) &test_code, DFLT_PERM);
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msr = MSR_SF | MSR_IR | MSR_DR | MSR_LE;
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ret = callit(2, 0, 0x0, msr);
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return ret;
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}
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int fail = 0;
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void do_test(int num, int (*test)(void))
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{
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int ret;
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print_test_number(num);
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ret = test();
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if (ret == 0) {
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print_string("PASS\r\n");
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} else {
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fail = 1;
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print_string("FAIL ");
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print_hex(ret, 16);
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if (ret != 0 && (ret & ~0xfe0ul) == 0) {
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print_string(" SRR0=");
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print_hex(mfspr(SPRG0), 16);
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print_string(" SRR1=");
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print_hex(mfspr(SPRG1), 16);
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}
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print_string("\r\n");
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}
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}
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int main(void)
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{
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console_init();
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init_mmu();
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// Prime the branch caches
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__asm__ __volatile__("sc");
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do_test(1, mode_test_1);
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return fail;
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}
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@ -0,0 +1,210 @@
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/* Copyright 2013-2014 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* Load an immediate 64-bit value into a register */
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#define LOAD_IMM64(r, e) \
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lis r,(e)@highest; \
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ori r,r,(e)@higher; \
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rldicr r,r, 32, 31; \
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oris r,r, (e)@h; \
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ori r,r, (e)@l;
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.section ".head","ax"
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/*
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* Microwatt currently enters in LE mode at 0x0, so we don't need to
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* do any endian fix ups
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*/
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. = 0
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.global _start
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_start:
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LOAD_IMM64(%r10,__bss_start)
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LOAD_IMM64(%r11,__bss_end)
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subf %r11,%r10,%r11
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addi %r11,%r11,63
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srdi. %r11,%r11,6
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beq 2f
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mtctr %r11
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1: dcbz 0,%r10
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addi %r10,%r10,64
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bdnz 1b
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2: LOAD_IMM64(%r1,__stack_top)
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li %r0,0
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stdu %r0,-16(%r1)
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mtsprg2 %r0
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LOAD_IMM64(%r12, main)
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mtctr %r12
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bctrl
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attn // terminate on exit
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b .
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#define EXCEPTION(nr) \
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.= nr; \
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b .
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EXCEPTION(0x300)
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EXCEPTION(0x380)
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. = 0x400
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b call_ret
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EXCEPTION(0x480)
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EXCEPTION(0x500)
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EXCEPTION(0x600)
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EXCEPTION(0x700)
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EXCEPTION(0x800)
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EXCEPTION(0x900)
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EXCEPTION(0x980)
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EXCEPTION(0xa00)
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EXCEPTION(0xb00)
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. = 0xc00
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nop
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nop
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nop
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nop
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b 1f
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nop
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1: rfid
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EXCEPTION(0xd00)
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EXCEPTION(0xe00)
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EXCEPTION(0xe20)
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EXCEPTION(0xe40)
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EXCEPTION(0xe60)
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EXCEPTION(0xe80)
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EXCEPTION(0xf00)
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EXCEPTION(0xf20)
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EXCEPTION(0xf40)
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EXCEPTION(0xf60)
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EXCEPTION(0xf80)
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. = 0x1000
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/*
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* This page gets mapped at virtual address 0
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*/
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.globl test_code
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test_code:
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b 1f
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. = 0x1c00
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1: nop
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nop
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nop
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nop
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li %r3,1
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li %r3,0
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// Exit via 0x400 exception
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ba -4
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.globl test_code_end
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test_code_end:
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. = 0x2000
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/*
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* Call a function in a context with a given MSR value.
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* r3, r4 = args; r5 = function; r6 = MSR
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*/
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.globl callit
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callit:
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mflr %r0
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std %r0,16(%r1)
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stdu %r1,-256(%r1)
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mfcr %r8
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stw %r8,100(%r1)
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std %r13,104(%r1)
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std %r14,112(%r1)
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std %r15,120(%r1)
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std %r16,128(%r1)
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std %r17,136(%r1)
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std %r18,144(%r1)
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std %r19,152(%r1)
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std %r20,160(%r1)
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std %r21,168(%r1)
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std %r22,176(%r1)
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std %r23,184(%r1)
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std %r24,192(%r1)
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std %r25,200(%r1)
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std %r26,208(%r1)
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std %r27,216(%r1)
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std %r28,224(%r1)
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std %r29,232(%r1)
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std %r30,240(%r1)
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std %r31,248(%r1)
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li %r0,restore@l
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mtsprg0 %r0
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mtsprg1 %r1
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mtsprg2 %r2
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mfmsr %r9
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mtsprg3 %r9
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li %r10,call_ret@l
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mtlr %r10
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mtsrr0 %r5
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mtsrr1 %r6
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mr %r12,%r5
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rfid
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call_ret:
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tdi 0,%r0,0x48 /* b .+8 if wrong endian */
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b 2f /* if endian OK */
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/* reverse-endian version of instructions from 2: on */
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.long 0xa642107c
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.long 0xa642937c
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.long 0xa602ba7c
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.long 0xa602db7c
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.long 0xa643b07c
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.long 0xa643d37c
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.long 0xa6031a7c
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.long 0xa6039b7c
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.long 0x2400004c
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2: mfsprg0 %r0
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mfsprg3 %r4
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mfsrr0 %r5
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mfsrr1 %r6
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mtsprg0 %r5
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mtsprg3 %r6
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mtsrr0 %r0
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mtsrr1 %r4
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rfid
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restore:
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mfsprg1 %r1
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mfsprg2 %r2
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li %r7,0
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mtsprg2 %r7
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lwz %r8,100(%r1)
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mtcr %r8
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ld %r13,104(%r1)
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ld %r14,112(%r1)
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ld %r15,120(%r1)
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ld %r16,128(%r1)
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ld %r17,136(%r1)
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ld %r18,144(%r1)
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ld %r19,152(%r1)
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ld %r20,160(%r1)
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ld %r21,168(%r1)
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ld %r22,176(%r1)
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ld %r23,184(%r1)
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ld %r24,192(%r1)
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ld %r25,200(%r1)
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ld %r26,208(%r1)
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ld %r27,216(%r1)
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ld %r28,224(%r1)
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ld %r29,232(%r1)
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ld %r30,240(%r1)
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ld %r31,248(%r1)
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addi %r1,%r1,256
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ld %r0,16(%r1)
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mtlr %r0
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blr
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@ -0,0 +1,27 @@
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SECTIONS
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{
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. = 0;
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_start = .;
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.head : {
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KEEP(*(.head))
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}
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. = ALIGN(0x1000);
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.text : { *(.text) *(.text.*) *(.rodata) *(.rodata.*) }
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. = ALIGN(0x1000);
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.data : { *(.data) *(.data.*) *(.got) *(.toc) }
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. = ALIGN(0x80);
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__bss_start = .;
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.bss : {
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*(.dynsbss)
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*(.sbss)
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*(.scommon)
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*(.dynbss)
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*(.bss)
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*(.common)
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*(.bss.*)
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}
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. = ALIGN(0x80);
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__bss_end = .;
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. = . + 0x4000;
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__stack_top = .;
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}
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Binary file not shown.
@ -0,0 +1 @@
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test 01:PASS
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@ -0,0 +1 @@
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144
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