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/*
 * arch/arm/probes/decode-arm.h
 *
 * Copyright 2013 Linaro Ltd.
 * Written by: David A. Long
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#ifndef _ARM_KERNEL_PROBES_ARM_H
#define  _ARM_KERNEL_PROBES_ARM_H

#include "decode.h"

enum probes_arm_action {
	PROBES_PRELOAD_IMM,
	PROBES_PRELOAD_REG,
	PROBES_BRANCH_IMM,
	PROBES_BRANCH_REG,
	PROBES_MRS,
	PROBES_CLZ,
	PROBES_SATURATING_ARITHMETIC,
	PROBES_MUL1,
	PROBES_MUL2,
	PROBES_SWP,
	PROBES_LDRSTRD,
	PROBES_LOAD,
	PROBES_STORE,
	PROBES_LOAD_EXTRA,
	PROBES_STORE_EXTRA,
	PROBES_MOV_IP_SP,
	PROBES_DATA_PROCESSING_REG,
	PROBES_DATA_PROCESSING_IMM,
	PROBES_MOV_HALFWORD,
	PROBES_SEV,
	PROBES_WFE,
	PROBES_SATURATE,
	PROBES_REV,
	PROBES_MMI,
	PROBES_PACK,
	PROBES_EXTEND,
	PROBES_EXTEND_ADD,
	PROBES_MUL_ADD_LONG,
	PROBES_MUL_ADD,
	PROBES_BITFIELD,
	PROBES_BRANCH,
	PROBES_LDMSTM,
	NUM_PROBES_ARM_ACTIONS
};

void __kprobes simulate_bbl(probes_opcode_t opcode,
	struct arch_probes_insn *asi, struct pt_regs *regs);
void __kprobes simulate_blx1(probes_opcode_t opcode,
	struct arch_probes_insn *asi, struct pt_regs *regs);
void __kprobes simulate_blx2bx(probes_opcode_t opcode,
	struct arch_probes_insn *asi, struct pt_regs *regs);
void __kprobes simulate_mrs(probes_opcode_t opcode,
	struct arch_probes_insn *asi, struct pt_regs *regs);
void __kprobes simulate_mov_ipsp(probes_opcode_t opcode,
	struct arch_probes_insn *asi, struct pt_regs *regs);

extern const union decode_item probes_decode_arm_table[];

enum probes_insn arm_probes_decode_insn(probes_opcode_t,
		struct arch_probes_insn *, bool emulate,
		const union decode_action *actions,
		const struct decode_checker *checkers[]);

#endif
ange *gtt = container_of(obj, struct gtt_range, gem); /* Remove the list map if one is present */ drm_gem_free_mmap_offset(obj); drm_gem_object_release(obj); /* This must occur last as it frees up the memory of the GEM object */ psb_gtt_free_range(obj->dev, gtt); } int psb_gem_get_aperture(struct drm_device *dev, void *data, struct drm_file *file) { return -EINVAL; } /** * psb_gem_dumb_map_gtt - buffer mapping for dumb interface * @file: our drm client file * @dev: drm device * @handle: GEM handle to the object (from dumb_create) * * Do the necessary setup to allow the mapping of the frame buffer * into user memory. We don't have to do much here at the moment. */ int psb_gem_dumb_map_gtt(struct drm_file *file, struct drm_device *dev, uint32_t handle, uint64_t *offset) { int ret = 0; struct drm_gem_object *obj; mutex_lock(&dev->struct_mutex); /* GEM does all our handle to object mapping */ obj = drm_gem_object_lookup(dev, file, handle); if (obj == NULL) { ret = -ENOENT; goto unlock; } /* What validation is needed here ? */ /* Make it mmapable */ ret = drm_gem_create_mmap_offset(obj); if (ret) goto out; *offset = drm_vma_node_offset_addr(&obj->vma_node); out: drm_gem_object_unreference(obj); unlock: mutex_unlock(&dev->struct_mutex); return ret; } /** * psb_gem_create - create a mappable object * @file: the DRM file of the client * @dev: our device * @size: the size requested * @handlep: returned handle (opaque number) * * Create a GEM object, fill in the boilerplate and attach a handle to * it so that userspace can speak about it. This does the core work * for the various methods that do/will create GEM objects for things */ int psb_gem_create(struct drm_file *file, struct drm_device *dev, u64 size, u32 *handlep, int stolen, u32 align) { struct gtt_range *r; int ret; u32 handle; size = roundup(size, PAGE_SIZE); /* Allocate our object - for now a direct gtt range which is not stolen memory backed */ r = psb_gtt_alloc_range(dev, size, "gem", 0, PAGE_SIZE); if (r == NULL) { dev_err(dev->dev, "no memory for %lld byte GEM object\n", size); return -ENOSPC; } /* Initialize the extra goodies GEM needs to do all the hard work */ if (drm_gem_object_init(dev, &r->gem, size) != 0) { psb_gtt_free_range(dev, r); /* GEM doesn't give an error code so use -ENOMEM */ dev_err(dev->dev, "GEM init failed for %lld\n", size); return -ENOMEM; } /* Limit the object to 32bit mappings */ mapping_set_gfp_mask(r->gem.filp->f_mapping, GFP_KERNEL | __GFP_DMA32); /* Give the object a handle so we can carry it more easily */ ret = drm_gem_handle_create(file, &r->gem, &handle); if (ret) { dev_err(dev->dev, "GEM handle failed for %p, %lld\n", &r->gem, size); drm_gem_object_release(&r->gem); psb_gtt_free_range(dev, r); return ret; } /* We have the initial and handle reference but need only one now */ drm_gem_object_unreference_unlocked(&r->gem); *handlep = handle; return 0; } /** * psb_gem_dumb_create - create a dumb buffer * @drm_file: our client file * @dev: our device * @args: the requested arguments copied from userspace * * Allocate a buffer suitable for use for a frame buffer of the * form described by user space. Give userspace a handle by which * to reference it. */ int psb_gem_dumb_create(struct drm_file *file, struct drm_device *dev, struct drm_mode_create_dumb *args) { args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64); args->size = args->pitch * args->height; return psb_gem_create(file, dev, args->size, &args->handle, 0, PAGE_SIZE); } /** * psb_gem_fault - pagefault handler for GEM objects * @vma: the VMA of the GEM object * @vmf: fault detail * * Invoked when a fault occurs on an mmap of a GEM managed area. GEM * does most of the work for us including the actual map/unmap calls * but we need to do the actual page work. * * This code eventually needs to handle faulting objects in and out * of the GTT and repacking it when we run out of space. We can put * that off for now and for our simple uses * * The VMA was set up by GEM. In doing so it also ensured that the * vma->vm_private_data points to the GEM object that is backing this * mapping. */ int psb_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { struct drm_gem_object *obj; struct gtt_range *r; int ret; unsigned long pfn; pgoff_t page_offset; struct drm_device *dev; struct drm_psb_private *dev_priv; obj = vma->vm_private_data; /* GEM object */ dev = obj->dev; dev_priv = dev->dev_private; r = container_of(obj, struct gtt_range, gem); /* Get the gtt range */ /* Make sure we don't parallel update on a fault, nor move or remove something from beneath our feet */ mutex_lock(&dev->struct_mutex); /* For now the mmap pins the object and it stays pinned. As things stand that will do us no harm */ if (r->mmapping == 0) { ret = psb_gtt_pin(r); if (ret < 0) { dev_err(dev->dev, "gma500: pin failed: %d\n", ret); goto fail; } r->mmapping = 1; } /* Page relative to the VMA start - we must calculate this ourselves because vmf->pgoff is the fake GEM offset */ page_offset = ((unsigned long) vmf->virtual_address - vma->vm_start) >> PAGE_SHIFT; /* CPU view of the page, don't go via the GART for CPU writes */ if (r->stolen) pfn = (dev_priv->stolen_base + r->offset) >> PAGE_SHIFT; else pfn = page_to_pfn(r->pages[page_offset]); ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn); fail: mutex_unlock(&dev->struct_mutex); switch (ret) { case 0: case -ERESTARTSYS: case -EINTR: return VM_FAULT_NOPAGE; case -ENOMEM: return VM_FAULT_OOM; default: return VM_FAULT_SIGBUS; } }