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[OpenOCD-devel] [PATCH]: 4a80af9 Implement CRC32 algorithm for RISC-V.
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From: <ge...@op...> - 2021-03-03 20:49:11
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This is an automated email from Gerrit. Tim Newsome (ti...@si...) just uploaded a new patch set to Gerrit, which you can find at http://openocd.zylin.com/6076 -- gerrit commit 4a80af9721bab45a3f6e38b0d131db3b76937053 Author: Tim Newsome <ti...@si...> Date: Wed Mar 3 12:41:03 2021 -0800 Implement CRC32 algorithm for RISC-V. Signed-off-by: Tim Newsome <ti...@si...> Change-Id: Id437f78e74e3d837ff203f84c4eeb996bfad9a01 diff --git a/contrib/loaders/checksum/Makefile b/contrib/loaders/checksum/Makefile index b9f59b8..623e425 100644 --- a/contrib/loaders/checksum/Makefile +++ b/contrib/loaders/checksum/Makefile @@ -6,25 +6,41 @@ ARM_OBJCOPY ?= $(ARM_CROSS_COMPILE)objcopy ARM_AFLAGS = -EL +RISCV_CROSS_COMPILE ?= riscv64-unknown-elf- +RISCV_CC ?= $(RISCV_CROSS_COMPILE)gcc +RISCV_OBJCOPY ?= $(RISCV_CROSS_COMPILE)objcopy +RISCV32_CFLAGS = -march=rv32e -mabi=ilp32e -nostdlib -nostartfiles -Os -fPIC +RISCV64_CFLAGS = -march=rv64i -mabi=lp64 -nostdlib -nostartfiles -Os -fPIC + +all: arm riscv + arm: armv4_5_crc.inc armv7m_crc.inc +riscv: riscv32_crc.inc riscv64_crc.inc + armv4_5_%.elf: armv4_5_%.s $(ARM_AS) $(ARM_AFLAGS) $< -o $@ armv4_5_%.bin: armv4_5_%.elf $(ARM_OBJCOPY) -Obinary $< $@ -armv4_5_%.inc: armv4_5_%.bin - $(BIN2C) < $< > $@ - armv7m_%.elf: armv7m_%.s $(ARM_AS) $(ARM_AFLAGS) $< -o $@ armv7m_%.bin: armv7m_%.elf $(ARM_OBJCOPY) -Obinary $< $@ -armv7m_%.inc: armv7m_%.bin +%.inc: %.bin $(BIN2C) < $< > $@ +riscv32_%.elf: riscv_%.c + $(RISCV_CC) $(RISCV32_CFLAGS) $< -o $@ + +riscv64_%.elf: riscv_%.c + $(RISCV_CC) $(RISCV64_CFLAGS) $< -o $@ + +riscv%.bin: riscv%.elf + $(RISCV_OBJCOPY) -Obinary $< $@ + clean: -rm -f *.elf *.bin *.inc diff --git a/contrib/loaders/checksum/riscv32_crc.inc b/contrib/loaders/checksum/riscv32_crc.inc new file mode 100644 index 0000000..d6566d2 --- /dev/null +++ b/contrib/loaders/checksum/riscv32_crc.inc @@ -0,0 +1,70 @@ +/* Autogenerated with ../../../src/helper/bin2char.sh */ +0xb3,0x05,0xb5,0x00,0x93,0x07,0xf0,0xff,0x17,0x07,0x00,0x00,0x13,0x07,0x47,0x04, +0x63,0x1a,0xb5,0x00,0x13,0x85,0x07,0x00,0x73,0x00,0x10,0x00,0x13,0x85,0x07,0x00, +0x67,0x80,0x00,0x00,0x03,0x46,0x05,0x00,0x93,0x96,0x87,0x00,0x93,0xd7,0x87,0x01, +0xb3,0xc7,0xc7,0x00,0x93,0x97,0x27,0x00,0xb3,0x07,0xf7,0x00,0x83,0xa7,0x07,0x00, 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+0xaf,0xf0,0x23,0xea,0x18,0xed,0xe2,0xee,0x1d,0xbd,0xa5,0xf0,0xaa,0xa0,0x64,0xf4, +0x73,0x86,0x27,0xf9,0xc4,0x9b,0xe6,0xfd,0x09,0xfd,0xb8,0x89,0xbe,0xe0,0x79,0x8d, +0x67,0xc6,0x3a,0x80,0xd0,0xdb,0xfb,0x84,0xd5,0x8b,0xbc,0x9a,0x62,0x96,0x7d,0x9e, +0xbb,0xb0,0x3e,0x93,0x0c,0xad,0xff,0x97,0xb1,0x10,0xb0,0xaf,0x06,0x0d,0x71,0xab, +0xdf,0x2b,0x32,0xa6,0x68,0x36,0xf3,0xa2,0x6d,0x66,0xb4,0xbc,0xda,0x7b,0x75,0xb8, +0x03,0x5d,0x36,0xb5,0xb4,0x40,0xf7,0xb1, diff --git a/contrib/loaders/checksum/riscv_crc.c b/contrib/loaders/checksum/riscv_crc.c new file mode 100644 index 0000000..b7e86c1 --- /dev/null +++ b/contrib/loaders/checksum/riscv_crc.c @@ -0,0 +1,135 @@ +/* Copied from https://github.com/gcc-mirror/gcc/blob/master/libiberty/crc32.c + * and then tweaked a little. */ + +/* This table was generated by the following program. + #include <stdio.h> + int + main () + { + unsigned int i, j; + unsigned int c; + int table[256]; + for (i = 0; i < 256; i++) + { + for (c = i << 24, j = 8; j > 0; --j) + c = c & 0x80000000 ? (c << 1) ^ 0x04c11db7 : (c << 1); + table[i] = c; + } + printf ("static const unsigned int crc32_table[] =\n{\n"); + for (i = 0; i < 256; i += 4) + { + printf (" 0x%08x, 0x%08x, 0x%08x, 0x%08x", + table[i + 0], table[i + 1], table[i + 2], table[i + 3]); + if (i + 4 < 256) + putchar (','); + putchar ('\n'); + } + printf ("};\n"); + return 0; + } + For more information on CRC, see, e.g., + http://www.ross.net/crc/download/crc_v3.txt. */ + +static const unsigned int crc32_table[] = { + 0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, + 0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005, + 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61, + 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, + 0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, + 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75, + 0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, + 0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd, + 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039, + 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, + 0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81, + 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d, + 0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, + 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95, + 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, + 0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, + 0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae, + 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072, + 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, + 0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca, + 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde, + 0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, + 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066, + 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba, + 0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, + 0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692, + 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6, + 0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, + 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e, + 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2, + 0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, + 0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a, + 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637, + 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, + 0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, + 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53, + 0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, + 0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b, + 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff, + 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, + 0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, + 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b, + 0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, + 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3, + 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, + 0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, + 0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f, + 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3, + 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, + 0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c, + 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8, + 0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, + 0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30, + 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec, + 0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, + 0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654, + 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0, + 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, + 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18, + 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4, + 0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, + 0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c, + 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668, + 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4 +}; + +/* +@deftypefn Extension {unsigned int} crc32 (const unsigned char *@var{buf}, @ + int @var{len}, unsigned int @var{init}) +Compute the 32-bit CRC of @var{buf} which has length @var{len}. The +starting value is 0xffffffff. +This is used by the @command{gdb} remote protocol for the @samp{qCRC} +command. +This CRC can be specified as: + Width : 32 + Poly : 0x04c11db7 + Init : 0xffffffff + RefIn : false + RefOut : false + XorOut : 0 +This differs from the "standard" CRC-32 algorithm in that the values +are not reflected, and there is no final XOR value. These differences +make it easy to compose the values of multiple blocks. +@end deftypefn +*/ + +#include <stdint.h> + +unsigned int +xcrc32(const unsigned char *buf, int len) +{ + uint32_t crc = 0xffffffff; + while (len--) { + crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ *buf) & 255]; + buf++; + } + asm("mv a0, %0;" + "ebreak;" + : + : "r"(crc)); + return crc; +} diff --git a/src/target/image.c b/src/target/image.c index 20c6d77..fd5eff8 100644 --- a/src/target/image.c +++ b/src/target/image.c @@ -1052,7 +1052,7 @@ int image_calculate_checksum(const uint8_t *buffer, uint32_t nbytes, uint32_t *c keep_alive(); } - LOG_DEBUG("Calculating checksum done"); + LOG_DEBUG("Calculating checksum done; checksum=0x%x", crc); *checksum = crc; return ERROR_OK; diff --git a/src/target/riscv/riscv.c b/src/target/riscv/riscv.c index c26e635..2f720e3 100644 --- a/src/target/riscv/riscv.c +++ b/src/target/riscv/riscv.c @@ -1853,7 +1853,86 @@ static int riscv_checksum_memory(struct target *target, target_addr_t address, uint32_t count, uint32_t *checksum) { - return ERROR_FAIL; + struct working_area *crc_algorithm; + struct reg_param reg_params[2]; + int retval; + + LOG_DEBUG("address=0x%" TARGET_PRIxADDR "; count=0x%x", address, count); + + static const uint8_t riscv32_crc_code[] = { +#include "../../contrib/loaders/checksum/riscv32_crc.inc" + }; + static const uint8_t riscv64_crc_code[] = { +#include "../../contrib/loaders/checksum/riscv64_crc.inc" + }; + + static const uint8_t *crc_code; + + int xlen = riscv_xlen(target); + unsigned crc_code_size; + if (xlen == 32) { + crc_code = riscv32_crc_code; + crc_code_size = sizeof(riscv32_crc_code); + } else { + crc_code = riscv64_crc_code; + crc_code_size = sizeof(riscv64_crc_code); + } + + if (count < crc_code_size * 4) { + /* Don't use the algorithm for relatively small buffers. It's faster + * just to read the memory. target_checksum_memory() will take care of + * that if we fail. */ + return ERROR_FAIL; + } + + retval = target_alloc_working_area(target, crc_code_size, &crc_algorithm); + if (retval != ERROR_OK) + return retval; + + if (crc_algorithm->address + crc_algorithm->size > address && + crc_algorithm->address < address + count) { + /* Region to checksum overlaps with the work area we've been assigned. + * Bail. (Would be better to manually checksum what we read there, and + * use the algorithm for the rest.) */ + target_free_working_area(target, crc_algorithm); + return ERROR_FAIL; + } + + retval = target_write_buffer(target, crc_algorithm->address, crc_code_size, + crc_code); + if (retval != ERROR_OK) { + LOG_ERROR("Failed to write code to " TARGET_ADDR_FMT ": %d", + crc_algorithm->address, retval); + target_free_working_area(target, crc_algorithm); + return retval; + } + + init_reg_param(®_params[0], "a0", xlen, PARAM_IN_OUT); + init_reg_param(®_params[1], "a1", xlen, PARAM_OUT); + buf_set_u64(reg_params[0].value, 0, xlen, address); + buf_set_u64(reg_params[1].value, 0, xlen, count); + + /* 20 second timeout/megabyte */ + int timeout = 20000 * (1 + (count / (1024 * 1024))); + + retval = target_run_algorithm(target, 0, NULL, 2, reg_params, + crc_algorithm->address, + 0, /* Leave exit point unspecified because we don't know. */ + timeout, NULL); + + if (retval == ERROR_OK) + *checksum = buf_get_u32(reg_params[0].value, 0, 32); + else + LOG_ERROR("error executing RISC-V CRC algorithm"); + + destroy_reg_param(®_params[0]); + destroy_reg_param(®_params[1]); + + target_free_working_area(target, crc_algorithm); + + LOG_DEBUG("checksum=0x%x, result=%d", *checksum, retval); + + return retval; } /*** OpenOCD Helper Functions ***/ -- |
