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Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 cleanups from Ingo Molnar: "Misc cleanups" * 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/apm: Fix spelling mistake: "caculate" -> "calculate" x86/mtrr: Rename main.c to mtrr.c and remove duplicate prefixes x86: Remove pr_fmt duplicate logging prefixes x86/early-quirks: Rename duplicate define of dev_err x86/bpf: Clean up non-standard comments, to make the code more readable
This commit is contained in:
Linus Torvalds
commit
0afe832e55
10 changed files with 188 additions and 155 deletions
|
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@ -889,7 +889,7 @@ static void force_ibs_eilvt_setup(void)
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if (!ibs_eilvt_valid())
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goto out;
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pr_info("IBS: LVT offset %d assigned\n", offset);
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pr_info("LVT offset %d assigned\n", offset);
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return;
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out:
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@ -2433,7 +2433,7 @@ MODULE_PARM_DESC(idle_threshold,
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"System idle percentage above which to make APM BIOS idle calls");
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module_param(idle_period, int, 0444);
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MODULE_PARM_DESC(idle_period,
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"Period (in sec/100) over which to caculate the idle percentage");
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"Period (in sec/100) over which to calculate the idle percentage");
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module_param(smp, bool, 0444);
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MODULE_PARM_DESC(smp,
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"Set this to enable APM use on an SMP platform. Use with caution on older systems");
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@ -1,3 +1,3 @@
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obj-y := main.o if.o generic.o cleanup.o
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obj-y := mtrr.o if.o generic.o cleanup.o
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obj-$(CONFIG_X86_32) += amd.o cyrix.o centaur.o
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@ -101,7 +101,7 @@ static int have_wrcomb(void)
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if (dev->vendor == PCI_VENDOR_ID_SERVERWORKS &&
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dev->device == PCI_DEVICE_ID_SERVERWORKS_LE &&
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dev->revision <= 5) {
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pr_info("mtrr: Serverworks LE rev < 6 detected. Write-combining disabled.\n");
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pr_info("Serverworks LE rev < 6 detected. Write-combining disabled.\n");
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pci_dev_put(dev);
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return 0;
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}
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@ -111,7 +111,7 @@ static int have_wrcomb(void)
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*/
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if (dev->vendor == PCI_VENDOR_ID_INTEL &&
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dev->device == PCI_DEVICE_ID_INTEL_82451NX) {
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pr_info("mtrr: Intel 450NX MMC detected. Write-combining disabled.\n");
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pr_info("Intel 450NX MMC detected. Write-combining disabled.\n");
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pci_dev_put(dev);
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return 0;
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}
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@ -313,24 +313,24 @@ int mtrr_add_page(unsigned long base, unsigned long size,
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return error;
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if (type >= MTRR_NUM_TYPES) {
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pr_warn("mtrr: type: %u invalid\n", type);
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pr_warn("type: %u invalid\n", type);
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return -EINVAL;
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}
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/* If the type is WC, check that this processor supports it */
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if ((type == MTRR_TYPE_WRCOMB) && !have_wrcomb()) {
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pr_warn("mtrr: your processor doesn't support write-combining\n");
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pr_warn("your processor doesn't support write-combining\n");
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return -ENOSYS;
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}
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if (!size) {
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pr_warn("mtrr: zero sized request\n");
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pr_warn("zero sized request\n");
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return -EINVAL;
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}
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if ((base | (base + size - 1)) >>
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(boot_cpu_data.x86_phys_bits - PAGE_SHIFT)) {
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pr_warn("mtrr: base or size exceeds the MTRR width\n");
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pr_warn("base or size exceeds the MTRR width\n");
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return -EINVAL;
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}
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@ -361,8 +361,7 @@ int mtrr_add_page(unsigned long base, unsigned long size,
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} else if (types_compatible(type, ltype))
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continue;
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}
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pr_warn("mtrr: 0x%lx000,0x%lx000 overlaps existing"
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" 0x%lx000,0x%lx000\n", base, size, lbase,
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pr_warn("0x%lx000,0x%lx000 overlaps existing 0x%lx000,0x%lx000\n", base, size, lbase,
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lsize);
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goto out;
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}
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@ -370,7 +369,7 @@ int mtrr_add_page(unsigned long base, unsigned long size,
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if (ltype != type) {
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if (types_compatible(type, ltype))
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continue;
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pr_warn("mtrr: type mismatch for %lx000,%lx000 old: %s new: %s\n",
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pr_warn("type mismatch for %lx000,%lx000 old: %s new: %s\n",
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base, size, mtrr_attrib_to_str(ltype),
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mtrr_attrib_to_str(type));
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goto out;
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@ -396,7 +395,7 @@ int mtrr_add_page(unsigned long base, unsigned long size,
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}
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}
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} else {
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pr_info("mtrr: no more MTRRs available\n");
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pr_info("no more MTRRs available\n");
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}
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error = i;
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out:
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@ -408,8 +407,8 @@ int mtrr_add_page(unsigned long base, unsigned long size,
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static int mtrr_check(unsigned long base, unsigned long size)
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{
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if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1))) {
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pr_warn("mtrr: size and base must be multiples of 4 kiB\n");
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pr_debug("mtrr: size: 0x%lx base: 0x%lx\n", size, base);
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pr_warn("size and base must be multiples of 4 kiB\n");
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pr_debug("size: 0x%lx base: 0x%lx\n", size, base);
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dump_stack();
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return -1;
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}
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@ -500,22 +499,22 @@ int mtrr_del_page(int reg, unsigned long base, unsigned long size)
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}
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}
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if (reg < 0) {
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pr_debug("mtrr: no MTRR for %lx000,%lx000 found\n",
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pr_debug("no MTRR for %lx000,%lx000 found\n",
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base, size);
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goto out;
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}
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}
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if (reg >= max) {
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pr_warn("mtrr: register: %d too big\n", reg);
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pr_warn("register: %d too big\n", reg);
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goto out;
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}
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mtrr_if->get(reg, &lbase, &lsize, <ype);
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if (lsize < 1) {
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pr_warn("mtrr: MTRR %d not used\n", reg);
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pr_warn("MTRR %d not used\n", reg);
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goto out;
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}
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if (mtrr_usage_table[reg] < 1) {
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pr_warn("mtrr: reg: %d has count=0\n", reg);
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pr_warn("reg: %d has count=0\n", reg);
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goto out;
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}
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if (--mtrr_usage_table[reg] < 1)
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@ -776,7 +775,7 @@ void __init mtrr_bp_init(void)
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}
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if (!mtrr_enabled()) {
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pr_info("MTRR: Disabled\n");
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pr_info("Disabled\n");
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/*
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* PAT initialization relies on MTRR's rendezvous handler.
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@ -155,7 +155,8 @@ static void __init __e820__range_add(struct e820_table *table, u64 start, u64 si
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int x = table->nr_entries;
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if (x >= ARRAY_SIZE(table->entries)) {
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pr_err("e820: too many entries; ignoring [mem %#010llx-%#010llx]\n", start, start + size - 1);
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pr_err("too many entries; ignoring [mem %#010llx-%#010llx]\n",
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start, start + size - 1);
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return;
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}
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@ -190,7 +191,8 @@ void __init e820__print_table(char *who)
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int i;
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for (i = 0; i < e820_table->nr_entries; i++) {
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pr_info("%s: [mem %#018Lx-%#018Lx] ", who,
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pr_info("%s: [mem %#018Lx-%#018Lx] ",
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who,
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e820_table->entries[i].addr,
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e820_table->entries[i].addr + e820_table->entries[i].size - 1);
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@ -574,7 +576,7 @@ void __init e820__update_table_print(void)
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if (e820__update_table(e820_table))
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return;
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pr_info("e820: modified physical RAM map:\n");
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pr_info("modified physical RAM map:\n");
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e820__print_table("modified");
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}
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@ -636,9 +638,8 @@ __init void e820__setup_pci_gap(void)
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if (!found) {
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#ifdef CONFIG_X86_64
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gapstart = (max_pfn << PAGE_SHIFT) + 1024*1024;
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pr_err(
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"e820: Cannot find an available gap in the 32-bit address range\n"
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"e820: PCI devices with unassigned 32-bit BARs may not work!\n");
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pr_err("Cannot find an available gap in the 32-bit address range\n");
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pr_err("PCI devices with unassigned 32-bit BARs may not work!\n");
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#else
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gapstart = 0x10000000;
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#endif
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@ -649,7 +650,8 @@ __init void e820__setup_pci_gap(void)
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*/
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pci_mem_start = gapstart;
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pr_info("e820: [mem %#010lx-%#010lx] available for PCI devices\n", gapstart, gapstart + gapsize - 1);
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pr_info("[mem %#010lx-%#010lx] available for PCI devices\n",
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gapstart, gapstart + gapsize - 1);
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}
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/*
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@ -711,7 +713,7 @@ void __init e820__memory_setup_extended(u64 phys_addr, u32 data_len)
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memcpy(e820_table_firmware, e820_table, sizeof(*e820_table_firmware));
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early_memunmap(sdata, data_len);
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pr_info("e820: extended physical RAM map:\n");
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pr_info("extended physical RAM map:\n");
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e820__print_table("extended");
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}
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@ -780,7 +782,7 @@ u64 __init e820__memblock_alloc_reserved(u64 size, u64 align)
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addr = __memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
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if (addr) {
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e820__range_update_kexec(addr, size, E820_TYPE_RAM, E820_TYPE_RESERVED);
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pr_info("e820: update e820_table_kexec for e820__memblock_alloc_reserved()\n");
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pr_info("update e820_table_kexec for e820__memblock_alloc_reserved()\n");
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e820__update_table_kexec();
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}
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@ -830,7 +832,7 @@ static unsigned long __init e820_end_pfn(unsigned long limit_pfn, enum e820_type
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if (last_pfn > max_arch_pfn)
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last_pfn = max_arch_pfn;
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pr_info("e820: last_pfn = %#lx max_arch_pfn = %#lx\n",
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pr_info("last_pfn = %#lx max_arch_pfn = %#lx\n",
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last_pfn, max_arch_pfn);
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return last_pfn;
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}
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@ -1005,7 +1007,7 @@ void __init e820__finish_early_params(void)
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if (e820__update_table(e820_table) < 0)
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early_panic("Invalid user supplied memory map");
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pr_info("e820: user-defined physical RAM map:\n");
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pr_info("user-defined physical RAM map:\n");
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e820__print_table("user");
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}
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}
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@ -1238,7 +1240,7 @@ void __init e820__memory_setup(void)
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memcpy(e820_table_kexec, e820_table, sizeof(*e820_table_kexec));
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memcpy(e820_table_firmware, e820_table, sizeof(*e820_table_firmware));
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pr_info("e820: BIOS-provided physical RAM map:\n");
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pr_info("BIOS-provided physical RAM map:\n");
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e820__print_table(who);
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}
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|
|
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@ -28,8 +28,6 @@
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#include <asm/irq_remapping.h>
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#include <asm/early_ioremap.h>
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#define dev_err(msg) pr_err("pci 0000:%02x:%02x.%d: %s", bus, slot, func, msg)
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static void __init fix_hypertransport_config(int num, int slot, int func)
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{
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u32 htcfg;
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@ -617,7 +615,8 @@ static void __init apple_airport_reset(int bus, int slot, int func)
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pmcsr = read_pci_config_16(bus, slot, func, BCM4331_PM_CAP + PCI_PM_CTRL);
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if ((pmcsr & PCI_PM_CTRL_STATE_MASK) != PCI_D0) {
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dev_err("Cannot power up Apple AirPort card\n");
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pr_err("pci 0000:%02x:%02x.%d: Cannot power up Apple AirPort card\n",
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bus, slot, func);
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||||
return;
|
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}
|
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}
|
||||
|
|
@ -628,7 +627,8 @@ static void __init apple_airport_reset(int bus, int slot, int func)
|
|||
|
||||
mmio = early_ioremap(addr, BCM4331_MMIO_SIZE);
|
||||
if (!mmio) {
|
||||
dev_err("Cannot iomap Apple AirPort card\n");
|
||||
pr_err("pci 0000:%02x:%02x.%d: Cannot iomap Apple AirPort card\n",
|
||||
bus, slot, func);
|
||||
return;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -975,8 +975,7 @@ int __init hpet_enable(void)
|
|||
cfg &= ~(HPET_CFG_ENABLE | HPET_CFG_LEGACY);
|
||||
hpet_writel(cfg, HPET_CFG);
|
||||
if (cfg)
|
||||
pr_warn("HPET: Unrecognized bits %#x set in global cfg\n",
|
||||
cfg);
|
||||
pr_warn("Unrecognized bits %#x set in global cfg\n", cfg);
|
||||
|
||||
for (i = 0; i <= last; ++i) {
|
||||
cfg = hpet_readl(HPET_Tn_CFG(i));
|
||||
|
|
@ -988,7 +987,7 @@ int __init hpet_enable(void)
|
|||
| HPET_TN_64BIT_CAP | HPET_TN_32BIT | HPET_TN_ROUTE
|
||||
| HPET_TN_FSB | HPET_TN_FSB_CAP);
|
||||
if (cfg)
|
||||
pr_warn("HPET: Unrecognized bits %#x set in cfg#%u\n",
|
||||
pr_warn("Unrecognized bits %#x set in cfg#%u\n",
|
||||
cfg, i);
|
||||
}
|
||||
hpet_print_config();
|
||||
|
|
|
|||
|
|
@ -1083,8 +1083,8 @@ arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs
|
|||
return orig_ret_vaddr;
|
||||
|
||||
if (nleft != rasize) {
|
||||
pr_err("uprobe: return address clobbered: pid=%d, %%sp=%#lx, "
|
||||
"%%ip=%#lx\n", current->pid, regs->sp, regs->ip);
|
||||
pr_err("return address clobbered: pid=%d, %%sp=%#lx, %%ip=%#lx\n",
|
||||
current->pid, regs->sp, regs->ip);
|
||||
|
||||
force_sig_info(SIGSEGV, SEND_SIG_FORCED, current);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -136,13 +136,13 @@ static int __init numa_add_memblk_to(int nid, u64 start, u64 end,
|
|||
|
||||
/* whine about and ignore invalid blks */
|
||||
if (start > end || nid < 0 || nid >= MAX_NUMNODES) {
|
||||
pr_warning("NUMA: Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
|
||||
pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
|
||||
nid, start, end - 1);
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (mi->nr_blks >= NR_NODE_MEMBLKS) {
|
||||
pr_err("NUMA: too many memblk ranges\n");
|
||||
pr_err("too many memblk ranges\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
|
|
@ -267,12 +267,12 @@ int __init numa_cleanup_meminfo(struct numa_meminfo *mi)
|
|||
*/
|
||||
if (bi->end > bj->start && bi->start < bj->end) {
|
||||
if (bi->nid != bj->nid) {
|
||||
pr_err("NUMA: node %d [mem %#010Lx-%#010Lx] overlaps with node %d [mem %#010Lx-%#010Lx]\n",
|
||||
pr_err("node %d [mem %#010Lx-%#010Lx] overlaps with node %d [mem %#010Lx-%#010Lx]\n",
|
||||
bi->nid, bi->start, bi->end - 1,
|
||||
bj->nid, bj->start, bj->end - 1);
|
||||
return -EINVAL;
|
||||
}
|
||||
pr_warning("NUMA: Warning: node %d [mem %#010Lx-%#010Lx] overlaps with itself [mem %#010Lx-%#010Lx]\n",
|
||||
pr_warn("Warning: node %d [mem %#010Lx-%#010Lx] overlaps with itself [mem %#010Lx-%#010Lx]\n",
|
||||
bi->nid, bi->start, bi->end - 1,
|
||||
bj->start, bj->end - 1);
|
||||
}
|
||||
|
|
@ -364,7 +364,7 @@ static int __init numa_alloc_distance(void)
|
|||
phys = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
|
||||
size, PAGE_SIZE);
|
||||
if (!phys) {
|
||||
pr_warning("NUMA: Warning: can't allocate distance table!\n");
|
||||
pr_warn("Warning: can't allocate distance table!\n");
|
||||
/* don't retry until explicitly reset */
|
||||
numa_distance = (void *)1LU;
|
||||
return -ENOMEM;
|
||||
|
|
@ -410,14 +410,14 @@ void __init numa_set_distance(int from, int to, int distance)
|
|||
|
||||
if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
|
||||
from < 0 || to < 0) {
|
||||
pr_warn_once("NUMA: Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
|
||||
pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
|
||||
from, to, distance);
|
||||
return;
|
||||
}
|
||||
|
||||
if ((u8)distance != distance ||
|
||||
(from == to && distance != LOCAL_DISTANCE)) {
|
||||
pr_warn_once("NUMA: Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
|
||||
pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
|
||||
from, to, distance);
|
||||
return;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,4 +1,5 @@
|
|||
/* bpf_jit_comp.c : BPF JIT compiler
|
||||
/*
|
||||
* bpf_jit_comp.c: BPF JIT compiler
|
||||
*
|
||||
* Copyright (C) 2011-2013 Eric Dumazet (eric.dumazet@gmail.com)
|
||||
* Internal BPF Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
|
||||
|
|
@ -17,7 +18,7 @@
|
|||
#include <asm/nospec-branch.h>
|
||||
|
||||
/*
|
||||
* assembly code in arch/x86/net/bpf_jit.S
|
||||
* Assembly code in arch/x86/net/bpf_jit.S
|
||||
*/
|
||||
extern u8 sk_load_word[], sk_load_half[], sk_load_byte[];
|
||||
extern u8 sk_load_word_positive_offset[], sk_load_half_positive_offset[];
|
||||
|
|
@ -45,6 +46,7 @@ static u8 *emit_code(u8 *ptr, u32 bytes, unsigned int len)
|
|||
#define EMIT2(b1, b2) EMIT((b1) + ((b2) << 8), 2)
|
||||
#define EMIT3(b1, b2, b3) EMIT((b1) + ((b2) << 8) + ((b3) << 16), 3)
|
||||
#define EMIT4(b1, b2, b3, b4) EMIT((b1) + ((b2) << 8) + ((b3) << 16) + ((b4) << 24), 4)
|
||||
|
||||
#define EMIT1_off32(b1, off) \
|
||||
do { EMIT1(b1); EMIT(off, 4); } while (0)
|
||||
#define EMIT2_off32(b1, b2, off) \
|
||||
|
|
@ -71,7 +73,8 @@ static bool is_uimm32(u64 value)
|
|||
|
||||
/* mov dst, src */
|
||||
#define EMIT_mov(DST, SRC) \
|
||||
do {if (DST != SRC) \
|
||||
do { \
|
||||
if (DST != SRC) \
|
||||
EMIT3(add_2mod(0x48, DST, SRC), 0x89, add_2reg(0xC0, DST, SRC)); \
|
||||
} while (0)
|
||||
|
||||
|
|
@ -89,7 +92,8 @@ static int bpf_size_to_x86_bytes(int bpf_size)
|
|||
return 0;
|
||||
}
|
||||
|
||||
/* list of x86 cond jumps opcodes (. + s8)
|
||||
/*
|
||||
* List of x86 cond jumps opcodes (. + s8)
|
||||
* Add 0x10 (and an extra 0x0f) to generate far jumps (. + s32)
|
||||
*/
|
||||
#define X86_JB 0x72
|
||||
|
|
@ -106,35 +110,37 @@ static int bpf_size_to_x86_bytes(int bpf_size)
|
|||
#define CHOOSE_LOAD_FUNC(K, func) \
|
||||
((int)K < 0 ? ((int)K >= SKF_LL_OFF ? func##_negative_offset : func) : func##_positive_offset)
|
||||
|
||||
/* pick a register outside of BPF range for JIT internal work */
|
||||
/* Pick a register outside of BPF range for JIT internal work */
|
||||
#define AUX_REG (MAX_BPF_JIT_REG + 1)
|
||||
|
||||
/* The following table maps BPF registers to x64 registers.
|
||||
/*
|
||||
* The following table maps BPF registers to x86-64 registers.
|
||||
*
|
||||
* x64 register r12 is unused, since if used as base address
|
||||
* x86-64 register R12 is unused, since if used as base address
|
||||
* register in load/store instructions, it always needs an
|
||||
* extra byte of encoding and is callee saved.
|
||||
*
|
||||
* r9 caches skb->len - skb->data_len
|
||||
* r10 caches skb->data, and used for blinding (if enabled)
|
||||
* R9 caches skb->len - skb->data_len
|
||||
* R10 caches skb->data, and used for blinding (if enabled)
|
||||
*/
|
||||
static const int reg2hex[] = {
|
||||
[BPF_REG_0] = 0, /* rax */
|
||||
[BPF_REG_1] = 7, /* rdi */
|
||||
[BPF_REG_2] = 6, /* rsi */
|
||||
[BPF_REG_3] = 2, /* rdx */
|
||||
[BPF_REG_4] = 1, /* rcx */
|
||||
[BPF_REG_5] = 0, /* r8 */
|
||||
[BPF_REG_6] = 3, /* rbx callee saved */
|
||||
[BPF_REG_7] = 5, /* r13 callee saved */
|
||||
[BPF_REG_8] = 6, /* r14 callee saved */
|
||||
[BPF_REG_9] = 7, /* r15 callee saved */
|
||||
[BPF_REG_FP] = 5, /* rbp readonly */
|
||||
[BPF_REG_AX] = 2, /* r10 temp register */
|
||||
[AUX_REG] = 3, /* r11 temp register */
|
||||
[BPF_REG_0] = 0, /* RAX */
|
||||
[BPF_REG_1] = 7, /* RDI */
|
||||
[BPF_REG_2] = 6, /* RSI */
|
||||
[BPF_REG_3] = 2, /* RDX */
|
||||
[BPF_REG_4] = 1, /* RCX */
|
||||
[BPF_REG_5] = 0, /* R8 */
|
||||
[BPF_REG_6] = 3, /* RBX callee saved */
|
||||
[BPF_REG_7] = 5, /* R13 callee saved */
|
||||
[BPF_REG_8] = 6, /* R14 callee saved */
|
||||
[BPF_REG_9] = 7, /* R15 callee saved */
|
||||
[BPF_REG_FP] = 5, /* RBP readonly */
|
||||
[BPF_REG_AX] = 2, /* R10 temp register */
|
||||
[AUX_REG] = 3, /* R11 temp register */
|
||||
};
|
||||
|
||||
/* is_ereg() == true if BPF register 'reg' maps to x64 r8..r15
|
||||
/*
|
||||
* is_ereg() == true if BPF register 'reg' maps to x86-64 r8..r15
|
||||
* which need extra byte of encoding.
|
||||
* rax,rcx,...,rbp have simpler encoding
|
||||
*/
|
||||
|
|
@ -153,7 +159,7 @@ static bool is_axreg(u32 reg)
|
|||
return reg == BPF_REG_0;
|
||||
}
|
||||
|
||||
/* add modifiers if 'reg' maps to x64 registers r8..r15 */
|
||||
/* Add modifiers if 'reg' maps to x86-64 registers R8..R15 */
|
||||
static u8 add_1mod(u8 byte, u32 reg)
|
||||
{
|
||||
if (is_ereg(reg))
|
||||
|
|
@ -170,13 +176,13 @@ static u8 add_2mod(u8 byte, u32 r1, u32 r2)
|
|||
return byte;
|
||||
}
|
||||
|
||||
/* encode 'dst_reg' register into x64 opcode 'byte' */
|
||||
/* Encode 'dst_reg' register into x86-64 opcode 'byte' */
|
||||
static u8 add_1reg(u8 byte, u32 dst_reg)
|
||||
{
|
||||
return byte + reg2hex[dst_reg];
|
||||
}
|
||||
|
||||
/* encode 'dst_reg' and 'src_reg' registers into x64 opcode 'byte' */
|
||||
/* Encode 'dst_reg' and 'src_reg' registers into x86-64 opcode 'byte' */
|
||||
static u8 add_2reg(u8 byte, u32 dst_reg, u32 src_reg)
|
||||
{
|
||||
return byte + reg2hex[dst_reg] + (reg2hex[src_reg] << 3);
|
||||
|
|
@ -184,27 +190,28 @@ static u8 add_2reg(u8 byte, u32 dst_reg, u32 src_reg)
|
|||
|
||||
static void jit_fill_hole(void *area, unsigned int size)
|
||||
{
|
||||
/* fill whole space with int3 instructions */
|
||||
/* Fill whole space with INT3 instructions */
|
||||
memset(area, 0xcc, size);
|
||||
}
|
||||
|
||||
struct jit_context {
|
||||
int cleanup_addr; /* epilogue code offset */
|
||||
int cleanup_addr; /* Epilogue code offset */
|
||||
bool seen_ld_abs;
|
||||
bool seen_ax_reg;
|
||||
};
|
||||
|
||||
/* maximum number of bytes emitted while JITing one eBPF insn */
|
||||
/* Maximum number of bytes emitted while JITing one eBPF insn */
|
||||
#define BPF_MAX_INSN_SIZE 128
|
||||
#define BPF_INSN_SAFETY 64
|
||||
|
||||
#define AUX_STACK_SPACE \
|
||||
(32 /* space for rbx, r13, r14, r15 */ + \
|
||||
8 /* space for skb_copy_bits() buffer */)
|
||||
(32 /* Space for RBX, R13, R14, R15 */ + \
|
||||
8 /* Space for skb_copy_bits() buffer */)
|
||||
|
||||
#define PROLOGUE_SIZE 37
|
||||
|
||||
/* emit x64 prologue code for BPF program and check it's size.
|
||||
/*
|
||||
* Emit x86-64 prologue code for BPF program and check its size.
|
||||
* bpf_tail_call helper will skip it while jumping into another program
|
||||
*/
|
||||
static void emit_prologue(u8 **pprog, u32 stack_depth, bool ebpf_from_cbpf)
|
||||
|
|
@ -212,8 +219,11 @@ static void emit_prologue(u8 **pprog, u32 stack_depth, bool ebpf_from_cbpf)
|
|||
u8 *prog = *pprog;
|
||||
int cnt = 0;
|
||||
|
||||
EMIT1(0x55); /* push rbp */
|
||||
EMIT3(0x48, 0x89, 0xE5); /* mov rbp,rsp */
|
||||
/* push rbp */
|
||||
EMIT1(0x55);
|
||||
|
||||
/* mov rbp,rsp */
|
||||
EMIT3(0x48, 0x89, 0xE5);
|
||||
|
||||
/* sub rsp, rounded_stack_depth + AUX_STACK_SPACE */
|
||||
EMIT3_off32(0x48, 0x81, 0xEC,
|
||||
|
|
@ -222,14 +232,15 @@ static void emit_prologue(u8 **pprog, u32 stack_depth, bool ebpf_from_cbpf)
|
|||
/* sub rbp, AUX_STACK_SPACE */
|
||||
EMIT4(0x48, 0x83, 0xED, AUX_STACK_SPACE);
|
||||
|
||||
/* all classic BPF filters use R6(rbx) save it */
|
||||
/* All classic BPF filters use R6(rbx) save it */
|
||||
|
||||
/* mov qword ptr [rbp+0],rbx */
|
||||
EMIT4(0x48, 0x89, 0x5D, 0);
|
||||
|
||||
/* bpf_convert_filter() maps classic BPF register X to R7 and uses R8
|
||||
* as temporary, so all tcpdump filters need to spill/fill R7(r13) and
|
||||
* R8(r14). R9(r15) spill could be made conditional, but there is only
|
||||
/*
|
||||
* bpf_convert_filter() maps classic BPF register X to R7 and uses R8
|
||||
* as temporary, so all tcpdump filters need to spill/fill R7(R13) and
|
||||
* R8(R14). R9(R15) spill could be made conditional, but there is only
|
||||
* one 'bpf_error' return path out of helper functions inside bpf_jit.S
|
||||
* The overhead of extra spill is negligible for any filter other
|
||||
* than synthetic ones. Therefore not worth adding complexity.
|
||||
|
|
@ -243,9 +254,10 @@ static void emit_prologue(u8 **pprog, u32 stack_depth, bool ebpf_from_cbpf)
|
|||
EMIT4(0x4C, 0x89, 0x7D, 24);
|
||||
|
||||
if (!ebpf_from_cbpf) {
|
||||
/* Clear the tail call counter (tail_call_cnt): for eBPF tail
|
||||
/*
|
||||
* Clear the tail call counter (tail_call_cnt): for eBPF tail
|
||||
* calls we need to reset the counter to 0. It's done in two
|
||||
* instructions, resetting rax register to 0, and moving it
|
||||
* instructions, resetting RAX register to 0, and moving it
|
||||
* to the counter location.
|
||||
*/
|
||||
|
||||
|
|
@ -260,7 +272,9 @@ static void emit_prologue(u8 **pprog, u32 stack_depth, bool ebpf_from_cbpf)
|
|||
*pprog = prog;
|
||||
}
|
||||
|
||||
/* generate the following code:
|
||||
/*
|
||||
* Generate the following code:
|
||||
*
|
||||
* ... bpf_tail_call(void *ctx, struct bpf_array *array, u64 index) ...
|
||||
* if (index >= array->map.max_entries)
|
||||
* goto out;
|
||||
|
|
@ -278,22 +292,25 @@ static void emit_bpf_tail_call(u8 **pprog)
|
|||
int label1, label2, label3;
|
||||
int cnt = 0;
|
||||
|
||||
/* rdi - pointer to ctx
|
||||
/*
|
||||
* rdi - pointer to ctx
|
||||
* rsi - pointer to bpf_array
|
||||
* rdx - index in bpf_array
|
||||
*/
|
||||
|
||||
/* if (index >= array->map.max_entries)
|
||||
/*
|
||||
* if (index >= array->map.max_entries)
|
||||
* goto out;
|
||||
*/
|
||||
EMIT2(0x89, 0xD2); /* mov edx, edx */
|
||||
EMIT3(0x39, 0x56, /* cmp dword ptr [rsi + 16], edx */
|
||||
offsetof(struct bpf_array, map.max_entries));
|
||||
#define OFFSET1 (41 + RETPOLINE_RAX_BPF_JIT_SIZE) /* number of bytes to jump */
|
||||
#define OFFSET1 (41 + RETPOLINE_RAX_BPF_JIT_SIZE) /* Number of bytes to jump */
|
||||
EMIT2(X86_JBE, OFFSET1); /* jbe out */
|
||||
label1 = cnt;
|
||||
|
||||
/* if (tail_call_cnt > MAX_TAIL_CALL_CNT)
|
||||
/*
|
||||
* if (tail_call_cnt > MAX_TAIL_CALL_CNT)
|
||||
* goto out;
|
||||
*/
|
||||
EMIT2_off32(0x8B, 0x85, 36); /* mov eax, dword ptr [rbp + 36] */
|
||||
|
|
@ -308,7 +325,8 @@ static void emit_bpf_tail_call(u8 **pprog)
|
|||
EMIT4_off32(0x48, 0x8B, 0x84, 0xD6, /* mov rax, [rsi + rdx * 8 + offsetof(...)] */
|
||||
offsetof(struct bpf_array, ptrs));
|
||||
|
||||
/* if (prog == NULL)
|
||||
/*
|
||||
* if (prog == NULL)
|
||||
* goto out;
|
||||
*/
|
||||
EMIT3(0x48, 0x85, 0xC0); /* test rax,rax */
|
||||
|
|
@ -321,7 +339,8 @@ static void emit_bpf_tail_call(u8 **pprog)
|
|||
offsetof(struct bpf_prog, bpf_func));
|
||||
EMIT4(0x48, 0x83, 0xC0, PROLOGUE_SIZE); /* add rax, prologue_size */
|
||||
|
||||
/* now we're ready to jump into next BPF program
|
||||
/*
|
||||
* Wow we're ready to jump into next BPF program
|
||||
* rdi == ctx (1st arg)
|
||||
* rax == prog->bpf_func + prologue_size
|
||||
*/
|
||||
|
|
@ -340,7 +359,8 @@ static void emit_load_skb_data_hlen(u8 **pprog)
|
|||
u8 *prog = *pprog;
|
||||
int cnt = 0;
|
||||
|
||||
/* r9d = skb->len - skb->data_len (headlen)
|
||||
/*
|
||||
* r9d = skb->len - skb->data_len (headlen)
|
||||
* r10 = skb->data
|
||||
*/
|
||||
/* mov %r9d, off32(%rdi) */
|
||||
|
|
@ -361,7 +381,8 @@ static void emit_mov_imm32(u8 **pprog, bool sign_propagate,
|
|||
u8 b1, b2, b3;
|
||||
int cnt = 0;
|
||||
|
||||
/* optimization: if imm32 is positive, use 'mov %eax, imm32'
|
||||
/*
|
||||
* Optimization: if imm32 is positive, use 'mov %eax, imm32'
|
||||
* (which zero-extends imm32) to save 2 bytes.
|
||||
*/
|
||||
if (sign_propagate && (s32)imm32 < 0) {
|
||||
|
|
@ -373,7 +394,8 @@ static void emit_mov_imm32(u8 **pprog, bool sign_propagate,
|
|||
goto done;
|
||||
}
|
||||
|
||||
/* optimization: if imm32 is zero, use 'xor %eax, %eax'
|
||||
/*
|
||||
* Optimization: if imm32 is zero, use 'xor %eax, %eax'
|
||||
* to save 3 bytes.
|
||||
*/
|
||||
if (imm32 == 0) {
|
||||
|
|
@ -400,7 +422,8 @@ static void emit_mov_imm64(u8 **pprog, u32 dst_reg,
|
|||
int cnt = 0;
|
||||
|
||||
if (is_uimm32(((u64)imm32_hi << 32) | (u32)imm32_lo)) {
|
||||
/* For emitting plain u32, where sign bit must not be
|
||||
/*
|
||||
* For emitting plain u32, where sign bit must not be
|
||||
* propagated LLVM tends to load imm64 over mov32
|
||||
* directly, so save couple of bytes by just doing
|
||||
* 'mov %eax, imm32' instead.
|
||||
|
|
@ -525,7 +548,8 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
|
|||
else if (is_ereg(dst_reg))
|
||||
EMIT1(add_1mod(0x40, dst_reg));
|
||||
|
||||
/* b3 holds 'normal' opcode, b2 short form only valid
|
||||
/*
|
||||
* b3 holds 'normal' opcode, b2 short form only valid
|
||||
* in case dst is eax/rax.
|
||||
*/
|
||||
switch (BPF_OP(insn->code)) {
|
||||
|
|
@ -593,7 +617,8 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
|
|||
/* mov rax, dst_reg */
|
||||
EMIT_mov(BPF_REG_0, dst_reg);
|
||||
|
||||
/* xor edx, edx
|
||||
/*
|
||||
* xor edx, edx
|
||||
* equivalent to 'xor rdx, rdx', but one byte less
|
||||
*/
|
||||
EMIT2(0x31, 0xd2);
|
||||
|
|
@ -655,7 +680,7 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
|
|||
}
|
||||
break;
|
||||
}
|
||||
/* shifts */
|
||||
/* Shifts */
|
||||
case BPF_ALU | BPF_LSH | BPF_K:
|
||||
case BPF_ALU | BPF_RSH | BPF_K:
|
||||
case BPF_ALU | BPF_ARSH | BPF_K:
|
||||
|
|
@ -686,7 +711,7 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
|
|||
case BPF_ALU64 | BPF_RSH | BPF_X:
|
||||
case BPF_ALU64 | BPF_ARSH | BPF_X:
|
||||
|
||||
/* check for bad case when dst_reg == rcx */
|
||||
/* Check for bad case when dst_reg == rcx */
|
||||
if (dst_reg == BPF_REG_4) {
|
||||
/* mov r11, dst_reg */
|
||||
EMIT_mov(AUX_REG, dst_reg);
|
||||
|
|
@ -724,13 +749,13 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
|
|||
case BPF_ALU | BPF_END | BPF_FROM_BE:
|
||||
switch (imm32) {
|
||||
case 16:
|
||||
/* emit 'ror %ax, 8' to swap lower 2 bytes */
|
||||
/* Emit 'ror %ax, 8' to swap lower 2 bytes */
|
||||
EMIT1(0x66);
|
||||
if (is_ereg(dst_reg))
|
||||
EMIT1(0x41);
|
||||
EMIT3(0xC1, add_1reg(0xC8, dst_reg), 8);
|
||||
|
||||
/* emit 'movzwl eax, ax' */
|
||||
/* Emit 'movzwl eax, ax' */
|
||||
if (is_ereg(dst_reg))
|
||||
EMIT3(0x45, 0x0F, 0xB7);
|
||||
else
|
||||
|
|
@ -738,7 +763,7 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
|
|||
EMIT1(add_2reg(0xC0, dst_reg, dst_reg));
|
||||
break;
|
||||
case 32:
|
||||
/* emit 'bswap eax' to swap lower 4 bytes */
|
||||
/* Emit 'bswap eax' to swap lower 4 bytes */
|
||||
if (is_ereg(dst_reg))
|
||||
EMIT2(0x41, 0x0F);
|
||||
else
|
||||
|
|
@ -746,7 +771,7 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
|
|||
EMIT1(add_1reg(0xC8, dst_reg));
|
||||
break;
|
||||
case 64:
|
||||
/* emit 'bswap rax' to swap 8 bytes */
|
||||
/* Emit 'bswap rax' to swap 8 bytes */
|
||||
EMIT3(add_1mod(0x48, dst_reg), 0x0F,
|
||||
add_1reg(0xC8, dst_reg));
|
||||
break;
|
||||
|
|
@ -756,7 +781,8 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
|
|||
case BPF_ALU | BPF_END | BPF_FROM_LE:
|
||||
switch (imm32) {
|
||||
case 16:
|
||||
/* emit 'movzwl eax, ax' to zero extend 16-bit
|
||||
/*
|
||||
* Emit 'movzwl eax, ax' to zero extend 16-bit
|
||||
* into 64 bit
|
||||
*/
|
||||
if (is_ereg(dst_reg))
|
||||
|
|
@ -766,7 +792,7 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
|
|||
EMIT1(add_2reg(0xC0, dst_reg, dst_reg));
|
||||
break;
|
||||
case 32:
|
||||
/* emit 'mov eax, eax' to clear upper 32-bits */
|
||||
/* Emit 'mov eax, eax' to clear upper 32-bits */
|
||||
if (is_ereg(dst_reg))
|
||||
EMIT1(0x45);
|
||||
EMIT2(0x89, add_2reg(0xC0, dst_reg, dst_reg));
|
||||
|
|
@ -809,9 +835,9 @@ st: if (is_imm8(insn->off))
|
|||
|
||||
/* STX: *(u8*)(dst_reg + off) = src_reg */
|
||||
case BPF_STX | BPF_MEM | BPF_B:
|
||||
/* emit 'mov byte ptr [rax + off], al' */
|
||||
/* Emit 'mov byte ptr [rax + off], al' */
|
||||
if (is_ereg(dst_reg) || is_ereg(src_reg) ||
|
||||
/* have to add extra byte for x86 SIL, DIL regs */
|
||||
/* We have to add extra byte for x86 SIL, DIL regs */
|
||||
src_reg == BPF_REG_1 || src_reg == BPF_REG_2)
|
||||
EMIT2(add_2mod(0x40, dst_reg, src_reg), 0x88);
|
||||
else
|
||||
|
|
@ -840,25 +866,26 @@ stx: if (is_imm8(insn->off))
|
|||
|
||||
/* LDX: dst_reg = *(u8*)(src_reg + off) */
|
||||
case BPF_LDX | BPF_MEM | BPF_B:
|
||||
/* emit 'movzx rax, byte ptr [rax + off]' */
|
||||
/* Emit 'movzx rax, byte ptr [rax + off]' */
|
||||
EMIT3(add_2mod(0x48, src_reg, dst_reg), 0x0F, 0xB6);
|
||||
goto ldx;
|
||||
case BPF_LDX | BPF_MEM | BPF_H:
|
||||
/* emit 'movzx rax, word ptr [rax + off]' */
|
||||
/* Emit 'movzx rax, word ptr [rax + off]' */
|
||||
EMIT3(add_2mod(0x48, src_reg, dst_reg), 0x0F, 0xB7);
|
||||
goto ldx;
|
||||
case BPF_LDX | BPF_MEM | BPF_W:
|
||||
/* emit 'mov eax, dword ptr [rax+0x14]' */
|
||||
/* Emit 'mov eax, dword ptr [rax+0x14]' */
|
||||
if (is_ereg(dst_reg) || is_ereg(src_reg))
|
||||
EMIT2(add_2mod(0x40, src_reg, dst_reg), 0x8B);
|
||||
else
|
||||
EMIT1(0x8B);
|
||||
goto ldx;
|
||||
case BPF_LDX | BPF_MEM | BPF_DW:
|
||||
/* emit 'mov rax, qword ptr [rax+0x14]' */
|
||||
/* Emit 'mov rax, qword ptr [rax+0x14]' */
|
||||
EMIT2(add_2mod(0x48, src_reg, dst_reg), 0x8B);
|
||||
ldx: /* if insn->off == 0 we can save one extra byte, but
|
||||
* special case of x86 r13 which always needs an offset
|
||||
ldx: /*
|
||||
* If insn->off == 0 we can save one extra byte, but
|
||||
* special case of x86 R13 which always needs an offset
|
||||
* is not worth the hassle
|
||||
*/
|
||||
if (is_imm8(insn->off))
|
||||
|
|
@ -870,7 +897,7 @@ stx: if (is_imm8(insn->off))
|
|||
|
||||
/* STX XADD: lock *(u32*)(dst_reg + off) += src_reg */
|
||||
case BPF_STX | BPF_XADD | BPF_W:
|
||||
/* emit 'lock add dword ptr [rax + off], eax' */
|
||||
/* Emit 'lock add dword ptr [rax + off], eax' */
|
||||
if (is_ereg(dst_reg) || is_ereg(src_reg))
|
||||
EMIT3(0xF0, add_2mod(0x40, dst_reg, src_reg), 0x01);
|
||||
else
|
||||
|
|
@ -897,14 +924,15 @@ xadd: if (is_imm8(insn->off))
|
|||
} else {
|
||||
EMIT2(0x41, 0x52); /* push %r10 */
|
||||
EMIT2(0x41, 0x51); /* push %r9 */
|
||||
/* need to adjust jmp offset, since
|
||||
/*
|
||||
* We need to adjust jmp offset, since
|
||||
* pop %r9, pop %r10 take 4 bytes after call insn
|
||||
*/
|
||||
jmp_offset += 4;
|
||||
}
|
||||
}
|
||||
if (!imm32 || !is_simm32(jmp_offset)) {
|
||||
pr_err("unsupported bpf func %d addr %p image %p\n",
|
||||
pr_err("unsupported BPF func %d addr %p image %p\n",
|
||||
imm32, func, image);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
|
@ -970,7 +998,7 @@ xadd: if (is_imm8(insn->off))
|
|||
else
|
||||
EMIT2_off32(0x81, add_1reg(0xF8, dst_reg), imm32);
|
||||
|
||||
emit_cond_jmp: /* convert BPF opcode to x86 */
|
||||
emit_cond_jmp: /* Convert BPF opcode to x86 */
|
||||
switch (BPF_OP(insn->code)) {
|
||||
case BPF_JEQ:
|
||||
jmp_cond = X86_JE;
|
||||
|
|
@ -996,22 +1024,22 @@ xadd: if (is_imm8(insn->off))
|
|||
jmp_cond = X86_JBE;
|
||||
break;
|
||||
case BPF_JSGT:
|
||||
/* signed '>', GT in x86 */
|
||||
/* Signed '>', GT in x86 */
|
||||
jmp_cond = X86_JG;
|
||||
break;
|
||||
case BPF_JSLT:
|
||||
/* signed '<', LT in x86 */
|
||||
/* Signed '<', LT in x86 */
|
||||
jmp_cond = X86_JL;
|
||||
break;
|
||||
case BPF_JSGE:
|
||||
/* signed '>=', GE in x86 */
|
||||
/* Signed '>=', GE in x86 */
|
||||
jmp_cond = X86_JGE;
|
||||
break;
|
||||
case BPF_JSLE:
|
||||
/* signed '<=', LE in x86 */
|
||||
/* Signed '<=', LE in x86 */
|
||||
jmp_cond = X86_JLE;
|
||||
break;
|
||||
default: /* to silence gcc warning */
|
||||
default: /* to silence GCC warning */
|
||||
return -EFAULT;
|
||||
}
|
||||
jmp_offset = addrs[i + insn->off] - addrs[i];
|
||||
|
|
@ -1039,7 +1067,7 @@ xadd: if (is_imm8(insn->off))
|
|||
jmp_offset = addrs[i + insn->off] - addrs[i];
|
||||
|
||||
if (!jmp_offset)
|
||||
/* optimize out nop jumps */
|
||||
/* Optimize out nop jumps */
|
||||
break;
|
||||
emit_jmp:
|
||||
if (is_imm8(jmp_offset)) {
|
||||
|
|
@ -1061,7 +1089,7 @@ xadd: if (is_imm8(insn->off))
|
|||
ctx->seen_ld_abs = seen_ld_abs = true;
|
||||
jmp_offset = func - (image + addrs[i]);
|
||||
if (!func || !is_simm32(jmp_offset)) {
|
||||
pr_err("unsupported bpf func %d addr %p image %p\n",
|
||||
pr_err("unsupported BPF func %d addr %p image %p\n",
|
||||
imm32, func, image);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
|
@ -1080,7 +1108,8 @@ xadd: if (is_imm8(insn->off))
|
|||
EMIT2_off32(0x81, 0xC6, imm32);
|
||||
}
|
||||
}
|
||||
/* skb pointer is in R6 (%rbx), it will be copied into
|
||||
/*
|
||||
* skb pointer is in R6 (%rbx), it will be copied into
|
||||
* %rdi if skb_copy_bits() call is necessary.
|
||||
* sk_load_* helpers also use %r10 and %r9d.
|
||||
* See bpf_jit.S
|
||||
|
|
@ -1111,7 +1140,7 @@ xadd: if (is_imm8(insn->off))
|
|||
goto emit_jmp;
|
||||
}
|
||||
seen_exit = true;
|
||||
/* update cleanup_addr */
|
||||
/* Update cleanup_addr */
|
||||
ctx->cleanup_addr = proglen;
|
||||
/* mov rbx, qword ptr [rbp+0] */
|
||||
EMIT4(0x48, 0x8B, 0x5D, 0);
|
||||
|
|
@ -1129,10 +1158,11 @@ xadd: if (is_imm8(insn->off))
|
|||
break;
|
||||
|
||||
default:
|
||||
/* By design x64 JIT should support all BPF instructions
|
||||
/*
|
||||
* By design x86-64 JIT should support all BPF instructions.
|
||||
* This error will be seen if new instruction was added
|
||||
* to interpreter, but not to JIT
|
||||
* or if there is junk in bpf_prog
|
||||
* to the interpreter, but not to the JIT, or if there is
|
||||
* junk in bpf_prog.
|
||||
*/
|
||||
pr_err("bpf_jit: unknown opcode %02x\n", insn->code);
|
||||
return -EINVAL;
|
||||
|
|
@ -1184,7 +1214,8 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
|
|||
return orig_prog;
|
||||
|
||||
tmp = bpf_jit_blind_constants(prog);
|
||||
/* If blinding was requested and we failed during blinding,
|
||||
/*
|
||||
* If blinding was requested and we failed during blinding,
|
||||
* we must fall back to the interpreter.
|
||||
*/
|
||||
if (IS_ERR(tmp))
|
||||
|
|
@ -1218,8 +1249,9 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
|
|||
goto out_addrs;
|
||||
}
|
||||
|
||||
/* Before first pass, make a rough estimation of addrs[]
|
||||
* each bpf instruction is translated to less than 64 bytes
|
||||
/*
|
||||
* Before first pass, make a rough estimation of addrs[]
|
||||
* each BPF instruction is translated to less than 64 bytes
|
||||
*/
|
||||
for (proglen = 0, i = 0; i < prog->len; i++) {
|
||||
proglen += 64;
|
||||
|
|
@ -1228,10 +1260,11 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
|
|||
ctx.cleanup_addr = proglen;
|
||||
skip_init_addrs:
|
||||
|
||||
/* JITed image shrinks with every pass and the loop iterates
|
||||
* until the image stops shrinking. Very large bpf programs
|
||||
/*
|
||||
* JITed image shrinks with every pass and the loop iterates
|
||||
* until the image stops shrinking. Very large BPF programs
|
||||
* may converge on the last pass. In such case do one more
|
||||
* pass to emit the final image
|
||||
* pass to emit the final image.
|
||||
*/
|
||||
for (pass = 0; pass < 20 || image; pass++) {
|
||||
proglen = do_jit(prog, addrs, image, oldproglen, &ctx);
|
||||
|
|
|
|||
Loading…
Reference in a new issue