diff options
Diffstat (limited to '')
| -rw-r--r-- | src/liblzma/api/lzma/bcj.h | 35 | ||||
| -rw-r--r-- | src/liblzma/common/filter_common.c | 9 | ||||
| -rw-r--r-- | src/liblzma/common/filter_decoder.c | 8 | ||||
| -rw-r--r-- | src/liblzma/common/filter_encoder.c | 11 | ||||
| -rw-r--r-- | src/liblzma/simple/Makefile.inc | 4 | ||||
| -rw-r--r-- | src/liblzma/simple/arm64.c | 227 | ||||
| -rw-r--r-- | src/liblzma/simple/simple_coder.h | 9 | ||||
| -rw-r--r-- | src/liblzma/simple/simple_decoder.h | 4 | ||||
| -rw-r--r-- | src/liblzma/simple/simple_encoder.h | 2 |
9 files changed, 308 insertions, 1 deletions
diff --git a/src/liblzma/api/lzma/bcj.h b/src/liblzma/api/lzma/bcj.h index 8e37538a..ba6cacb9 100644 --- a/src/liblzma/api/lzma/bcj.h +++ b/src/liblzma/api/lzma/bcj.h @@ -49,9 +49,16 @@ * Filter for SPARC binaries. */ +#define LZMA_FILTER_ARM64 LZMA_VLI_C(0x3FDB87B33B27000B) + /**< + * Filter for ARM64 binaries. + * + * \note Unlike the older filters above, this doesn't + * support any options (must be NULL). + */ /** - * \brief Options for BCJ filters + * \brief Options for BCJ filters (except ARM64) * * The BCJ filters never change the size of the data. Specifying options * for them is optional: if pointer to options is NULL, default value is @@ -88,3 +95,29 @@ typedef struct { uint32_t start_offset; } lzma_options_bcj; + +/** + * \brief Options for the ARM64 filter + * + * This filter never changes the size of the data. + * Specifying options is mandatory. + */ +typedef struct { + /** + * \brief How wide range of relative addresses are converted + * + * The ARM64 BL instruction has 26-bit immediate field that encodes + * a relative address as a multiple of four bytes, so the effective + * range is 2^28 bytes (+/-128 MiB). + * + * If width is 28 bits (LZMA_ARM64_WIDTH_MAX), then all BL + * instructions will be converted. This has a downside of some + * false matches that make compression worse. The best value + * depends on the input file and the differences can be significant; + * with large executables the maximum value is sometimes the best. + */ + uint32_t width; +# define LZMA_ARM64_WIDTH_MIN 18 +# define LZMA_ARM64_WIDTH_MAX 28 +# define LZMA_ARM64_WIDTH_DEFAULT 26 +} lzma_options_arm64; diff --git a/src/liblzma/common/filter_common.c b/src/liblzma/common/filter_common.c index 590be730..52401aa9 100644 --- a/src/liblzma/common/filter_common.c +++ b/src/liblzma/common/filter_common.c @@ -97,6 +97,15 @@ static const struct { .changes_size = false, }, #endif +#if defined(HAVE_ENCODER_ARM64) || defined(HAVE_DECODER_ARM64) + { + .id = LZMA_FILTER_ARM64, + .options_size = sizeof(lzma_options_arm64), + .non_last_ok = true, + .last_ok = false, + .changes_size = false, + }, +#endif #if defined(HAVE_ENCODER_SPARC) || defined(HAVE_DECODER_SPARC) { .id = LZMA_FILTER_SPARC, diff --git a/src/liblzma/common/filter_decoder.c b/src/liblzma/common/filter_decoder.c index c75b0a89..37af0cc2 100644 --- a/src/liblzma/common/filter_decoder.c +++ b/src/liblzma/common/filter_decoder.c @@ -99,6 +99,14 @@ static const lzma_filter_decoder decoders[] = { .props_decode = &lzma_simple_props_decode, }, #endif +#ifdef HAVE_DECODER_ARM64 + { + .id = LZMA_FILTER_ARM64, + .init = &lzma_simple_arm64_decoder_init, + .memusage = NULL, + .props_decode = &lzma_arm64_props_decode, + }, +#endif #ifdef HAVE_DECODER_SPARC { .id = LZMA_FILTER_SPARC, diff --git a/src/liblzma/common/filter_encoder.c b/src/liblzma/common/filter_encoder.c index c5d8f397..ec9e969d 100644 --- a/src/liblzma/common/filter_encoder.c +++ b/src/liblzma/common/filter_encoder.c @@ -126,6 +126,17 @@ static const lzma_filter_encoder encoders[] = { .props_encode = &lzma_simple_props_encode, }, #endif +#ifdef HAVE_ENCODER_ARM64 + { + .id = LZMA_FILTER_ARM64, + .init = &lzma_simple_arm64_encoder_init, + .memusage = NULL, + .block_size = NULL, + .props_size_get = NULL, + .props_size_fixed = 1, + .props_encode = &lzma_arm64_props_encode, + }, +#endif #ifdef HAVE_ENCODER_SPARC { .id = LZMA_FILTER_SPARC, diff --git a/src/liblzma/simple/Makefile.inc b/src/liblzma/simple/Makefile.inc index 8a5e2d7f..dc092f95 100644 --- a/src/liblzma/simple/Makefile.inc +++ b/src/liblzma/simple/Makefile.inc @@ -42,6 +42,10 @@ if COND_FILTER_ARMTHUMB liblzma_la_SOURCES += simple/armthumb.c endif +if COND_FILTER_ARM64 +liblzma_la_SOURCES += simple/arm64.c +endif + if COND_FILTER_SPARC liblzma_la_SOURCES += simple/sparc.c endif diff --git a/src/liblzma/simple/arm64.c b/src/liblzma/simple/arm64.c new file mode 100644 index 00000000..911e30c1 --- /dev/null +++ b/src/liblzma/simple/arm64.c @@ -0,0 +1,227 @@ +/////////////////////////////////////////////////////////////////////////////// +// +/// \file arm64.c +/// \brief Filter for ARM64 binaries +/// +// Authors: Lasse Collin +// Jia Tan +// +// This file has been put into the public domain. +// You can do whatever you want with this file. +// +/////////////////////////////////////////////////////////////////////////////// + +#include "simple_private.h" + +#ifdef HAVE_ENCODER_ARM64 +# include "simple_encoder.h" +#endif + +#ifdef HAVE_DECODER_ARM64 +# include "simple_decoder.h" +#endif + + +// In ARM64, there are two main branch instructions. +// bl - branch and link: Calls a function and stores the return address. +// b - branch: Jumps to a location, but does not store a return address. +// +// After some benchmarking, it was determined that only the bl instruction +// is beneficial for compression. A majority of the jumps for the b +// instruction are very small (+/- 0xFF). These are typical for loops +// and if-statements. Encoding them to their absolute address reduces +// redundancy since many of the small relative jump values are repeated, +// but very few of the absolute addresses are. +// +// Thus, only the bl instruction will be encoded and decoded. +// The bl instruction is 32 bits in size. The highest 6 bits contain +// the opcode (10 0101 == 0x25) and the remaining 26 bits are +// the immediate value. The immediate is a signed integer that +// encodes the target address as a multiple of four bytes so +// the range is +/-128 MiB. + +// The 6-bit op code for the bl instruction in ARM64 +#define ARM64_BL_OPCODE 0x25 + +// Once the 26-bit immediate is multiple by four, the address is 28 bits +// with the two lowest bits being zero. This mask is used to clear the +// unwanted bits. +#define ADDR28_MASK 0x0FFFFFFCU + + +typedef struct { + uint32_t sign_bit; + uint32_t sign_mask; +} lzma_simple_arm64; + + +static size_t +arm64_code(void *simple_ptr, uint32_t now_pos, bool is_encoder, + uint8_t *buffer, size_t size) +{ + const lzma_simple_arm64 *simple = simple_ptr; + const uint32_t sign_bit = simple->sign_bit; + const uint32_t sign_mask = simple->sign_mask; + + size_t i; + for (i = 0; i + 4 <= size; i += 4) { + if ((buffer[i + 3] >> 2) == ARM64_BL_OPCODE) { + // Get the relative 28-bit address from + // the 26-bit immediate. + uint32_t src = read32le(buffer + i); + src <<= 2; + src &= ADDR28_MASK; + + if ((src & sign_mask) != 0 + && (src & sign_mask) != sign_mask) + continue; + + // Some files like static libraries or Linux kernel + // modules have the immediate value filled with + // zeros. Converting these placeholder values would + // make compression worse so don't touch them. + if (src == 0) + continue; + + const uint32_t pc = now_pos + (uint32_t)(i); + + uint32_t dest; + if (is_encoder) + dest = pc + src; + else + dest = src - pc; + + dest &= ADDR28_MASK; + + // Sign-extend negative values or unset sign bits + // from positive values. + if (dest & sign_bit) + dest |= sign_mask; + else + dest &= ~sign_mask; + + assert((dest & sign_mask) == 0 + || (dest & sign_mask) == sign_mask); + + // Since also the decoder will ignore src values + // of 0, we must ensure that nothing is ever encoded + // to 0. This is achieved by encoding such values + // as pc instead. When decoding, pc will be first + // converted to 0 which we will catch here and fix. + if (dest == 0) { + // We cannot get here if pc is zero because + // then src would need to be zero too but we + // already ensured that src != 0. + assert((pc & ADDR28_MASK) != 0); + dest = is_encoder ? pc : 0U - pc; + dest &= ADDR28_MASK; + + if (dest & sign_bit) + dest |= sign_mask; + else + dest &= ~sign_mask; + } + + assert((dest & sign_mask) == 0 + || (dest & sign_mask) == sign_mask); + assert((dest & ~ADDR28_MASK) == 0); + + // Construct and store the modified 32-bit instruction. + dest >>= 2; + dest |= (uint32_t)ARM64_BL_OPCODE << 26; + write32le(buffer + i, dest); + } + } + + return i; +} + + +#ifdef HAVE_ENCODER_ARM64 +extern lzma_ret +lzma_arm64_props_encode(const void *options, uint8_t *out) +{ + const lzma_options_arm64 *const opt = options; + + if (opt->width < LZMA_ARM64_WIDTH_MIN + || opt->width > LZMA_ARM64_WIDTH_MAX) + return LZMA_OPTIONS_ERROR; + + out[0] = (uint8_t)(opt->width - LZMA_ARM64_WIDTH_MIN); + return LZMA_OK; +} +#endif + + +#ifdef HAVE_DECODER_ARM64 +extern lzma_ret +lzma_arm64_props_decode(void **options, const lzma_allocator *allocator, + const uint8_t *props, size_t props_size) +{ + if (props_size != 1) + return LZMA_OPTIONS_ERROR; + + if (props[0] > LZMA_ARM64_WIDTH_MAX - LZMA_ARM64_WIDTH_MIN) + return LZMA_OPTIONS_ERROR; + + lzma_options_arm64 *opt = lzma_alloc(sizeof(lzma_options_arm64), + allocator); + if (opt == NULL) + return LZMA_MEM_ERROR; + + opt->width = props[0] + LZMA_ARM64_WIDTH_MIN; + *options = opt; + return LZMA_OK; + +} +#endif + + +static lzma_ret +arm64_coder_init(lzma_next_coder *next, const lzma_allocator *allocator, + const lzma_filter_info *filters, bool is_encoder) +{ + if (filters[0].options == NULL) + return LZMA_PROG_ERROR; + + const lzma_options_arm64 *opt = filters[0].options; + if (opt->width < LZMA_ARM64_WIDTH_MIN + || opt->width > LZMA_ARM64_WIDTH_MAX) + return LZMA_OPTIONS_ERROR; + + const lzma_ret ret = lzma_simple_coder_init(next, allocator, filters, + &arm64_code, sizeof(lzma_simple_arm64), 4, 4, + is_encoder, false); + + if (ret == LZMA_OK) { + lzma_simple_coder *coder = next->coder; + lzma_simple_arm64 *simple = coder->simple; + + simple->sign_bit = UINT32_C(1) << (opt->width - 1); + simple->sign_mask = (UINT32_C(1) << 28) - simple->sign_bit; + } + + return ret; +} + + +#ifdef HAVE_ENCODER_ARM64 +extern lzma_ret +lzma_simple_arm64_encoder_init(lzma_next_coder *next, + const lzma_allocator *allocator, + const lzma_filter_info *filters) +{ + return arm64_coder_init(next, allocator, filters, true); +} +#endif + + +#ifdef HAVE_DECODER_ARM64 +extern lzma_ret +lzma_simple_arm64_decoder_init(lzma_next_coder *next, + const lzma_allocator *allocator, + const lzma_filter_info *filters) +{ + return arm64_coder_init(next, allocator, filters, false); +} +#endif diff --git a/src/liblzma/simple/simple_coder.h b/src/liblzma/simple/simple_coder.h index 19c2ee03..668a5092 100644 --- a/src/liblzma/simple/simple_coder.h +++ b/src/liblzma/simple/simple_coder.h @@ -61,6 +61,15 @@ extern lzma_ret lzma_simple_armthumb_decoder_init(lzma_next_coder *next, const lzma_filter_info *filters); +extern lzma_ret lzma_simple_arm64_encoder_init(lzma_next_coder *next, + const lzma_allocator *allocator, + const lzma_filter_info *filters); + +extern lzma_ret lzma_simple_arm64_decoder_init(lzma_next_coder *next, + const lzma_allocator *allocator, + const lzma_filter_info *filters); + + extern lzma_ret lzma_simple_sparc_encoder_init(lzma_next_coder *next, const lzma_allocator *allocator, const lzma_filter_info *filters); diff --git a/src/liblzma/simple/simple_decoder.h b/src/liblzma/simple/simple_decoder.h index bed8d37a..188d8370 100644 --- a/src/liblzma/simple/simple_decoder.h +++ b/src/liblzma/simple/simple_decoder.h @@ -19,4 +19,8 @@ extern lzma_ret lzma_simple_props_decode( void **options, const lzma_allocator *allocator, const uint8_t *props, size_t props_size); +extern lzma_ret lzma_arm64_props_decode( + void **options, const lzma_allocator *allocator, + const uint8_t *props, size_t props_size); + #endif diff --git a/src/liblzma/simple/simple_encoder.h b/src/liblzma/simple/simple_encoder.h index 1cee4823..10828f8f 100644 --- a/src/liblzma/simple/simple_encoder.h +++ b/src/liblzma/simple/simple_encoder.h @@ -20,4 +20,6 @@ extern lzma_ret lzma_simple_props_size(uint32_t *size, const void *options); extern lzma_ret lzma_simple_props_encode(const void *options, uint8_t *out); +extern lzma_ret lzma_arm64_props_encode(const void *options, uint8_t *out); + #endif |