From a143b0045ca8a7024a8515b5dda3ceab5f832e83 Mon Sep 17 00:00:00 2001 From: Andrew Burgess Date: Sun, 31 Jan 2016 00:41:12 +0000 Subject: [PATCH] opcodes/cgen: Rework calculation of shift when inserting fields The calculation of the shift amount, used to insert fields into the instruction buffer, is not correct when the following conditions are all true: - CGEN_INT_INSN_P is defined, and true. - CGEN_INSN_LSB0_P is true - Total instruction length is greater than the length of a single instruction word (the instruction is made of multiple words) - The word offset is non-zero (the field is outside the first word) When the above conditions are all true, the calculated shift fails to take account of the total instruction length. After this commit the calculation of the shift amount is split into two parts, first we calculate the shift required to get to BIT0 of the word in which the field lives, then we calculate the shift required to place the field within the instruction word. The change in this commit only effects the CGEN_INT_INSN_P defined true case, but changes the code for both CGEN_INSN_LSB0_P true, and false. In the case of CGEN_INSN_LSB0_P being false, the code used to say: shift = total_length - (word_offset + start + length); Now it says: shift_to_word = total_length - (word_offset + word_length); shift_within_word = word_length - start - length; shift = shift_to_word + shift_within_word; From which we can see that in all cases the computed shift value should be unchanged. In the case of CGEN_INSN_LSB0_P being true, the code used to say: shift = (word_offset + start + 1) - length; Now it says: shift_to_word = total_length - (word_offset + word_length); shift_within_word = start + 1 - length; shift = shift_to_word + shift_within_word; In the case where 'total_length == word_length' AND 'word_offset == 0' (which indicates an instruction of a single word), we see that the computed shift value will be unchanged. However, when the total_length and word_length are different, and the word_offset is non-zero then the computed shift value will be different (and correct). opcodes/ChangeLog: * cgen-ibld.in (insert_normal): Rework calculation of shift. * epiphany-ibld.c: Regenerate. * fr30-ibld.c: Regenerate. * frv-ibld.c: Regenerate. * ip2k-ibld.c: Regenerate. * iq2000-ibld.c: Regenerate. * lm32-ibld.c: Regenerate. * m32c-ibld.c: Regenerate. * m32r-ibld.c: Regenerate. * mep-ibld.c: Regenerate. * mt-ibld.c: Regenerate. * or1k-ibld.c: Regenerate. * xc16x-ibld.c: Regenerate. * xstormy16-ibld.c: Regenerate. --- opcodes/ChangeLog | 17 +++++++++++++++++ opcodes/cgen-ibld.in | 13 ++++++++++--- opcodes/epiphany-ibld.c | 13 ++++++++++--- opcodes/fr30-ibld.c | 13 ++++++++++--- opcodes/frv-ibld.c | 13 ++++++++++--- opcodes/ip2k-ibld.c | 13 ++++++++++--- opcodes/iq2000-ibld.c | 13 ++++++++++--- opcodes/lm32-ibld.c | 13 ++++++++++--- opcodes/m32c-ibld.c | 13 ++++++++++--- opcodes/m32r-ibld.c | 13 ++++++++++--- opcodes/mep-ibld.c | 13 ++++++++++--- opcodes/mt-ibld.c | 13 ++++++++++--- opcodes/or1k-ibld.c | 13 ++++++++++--- opcodes/xc16x-ibld.c | 13 ++++++++++--- opcodes/xstormy16-ibld.c | 13 ++++++++++--- 15 files changed, 157 insertions(+), 42 deletions(-) diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog index da14049635..83cbe6fd2e 100644 --- a/opcodes/ChangeLog +++ b/opcodes/ChangeLog @@ -1,3 +1,20 @@ +2016-02-02 Andrew Burgess + + * cgen-ibld.in (insert_normal): Rework calculation of shift. + * epiphany-ibld.c: Regenerate. + * fr30-ibld.c: Regenerate. + * frv-ibld.c: Regenerate. + * ip2k-ibld.c: Regenerate. + * iq2000-ibld.c: Regenerate. + * lm32-ibld.c: Regenerate. + * m32c-ibld.c: Regenerate. + * m32r-ibld.c: Regenerate. + * mep-ibld.c: Regenerate. + * mt-ibld.c: Regenerate. + * or1k-ibld.c: Regenerate. + * xc16x-ibld.c: Regenerate. + * xstormy16-ibld.c: Regenerate. + 2016-02-02 Andrew Burgess * epiphany-dis.c: Regenerated from latest cpu files. diff --git a/opcodes/cgen-ibld.in b/opcodes/cgen-ibld.in index 4730ff4ff6..cd6fffa5ae 100644 --- a/opcodes/cgen-ibld.in +++ b/opcodes/cgen-ibld.in @@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd, #if CGEN_INT_INSN_P { - int shift; + int shift_within_word, shift_to_word, shift; + /* How to shift the value to BIT0 of the word. */ + shift_to_word = total_length - (word_offset + word_length); + + /* How to shift the value to the field within the word. */ if (CGEN_INSN_LSB0_P) - shift = (word_offset + start + 1) - length; + shift_within_word = start + 1 - length; else - shift = total_length - (word_offset + start + length); + shift_within_word = word_length - start - length; + + /* The total SHIFT, then mask in the value. */ + shift = shift_to_word + shift_within_word; *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); } diff --git a/opcodes/epiphany-ibld.c b/opcodes/epiphany-ibld.c index c412169f4a..f978d4682f 100644 --- a/opcodes/epiphany-ibld.c +++ b/opcodes/epiphany-ibld.c @@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd, #if CGEN_INT_INSN_P { - int shift; + int shift_within_word, shift_to_word, shift; + /* How to shift the value to BIT0 of the word. */ + shift_to_word = total_length - (word_offset + word_length); + + /* How to shift the value to the field within the word. */ if (CGEN_INSN_LSB0_P) - shift = (word_offset + start + 1) - length; + shift_within_word = start + 1 - length; else - shift = total_length - (word_offset + start + length); + shift_within_word = word_length - start - length; + + /* The total SHIFT, then mask in the value. */ + shift = shift_to_word + shift_within_word; *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); } diff --git a/opcodes/fr30-ibld.c b/opcodes/fr30-ibld.c index 12b17335ba..1293e73ba2 100644 --- a/opcodes/fr30-ibld.c +++ b/opcodes/fr30-ibld.c @@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd, #if CGEN_INT_INSN_P { - int shift; + int shift_within_word, shift_to_word, shift; + /* How to shift the value to BIT0 of the word. */ + shift_to_word = total_length - (word_offset + word_length); + + /* How to shift the value to the field within the word. */ if (CGEN_INSN_LSB0_P) - shift = (word_offset + start + 1) - length; + shift_within_word = start + 1 - length; else - shift = total_length - (word_offset + start + length); + shift_within_word = word_length - start - length; + + /* The total SHIFT, then mask in the value. */ + shift = shift_to_word + shift_within_word; *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); } diff --git a/opcodes/frv-ibld.c b/opcodes/frv-ibld.c index bbcec67b3e..dba36aa604 100644 --- a/opcodes/frv-ibld.c +++ b/opcodes/frv-ibld.c @@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd, #if CGEN_INT_INSN_P { - int shift; + int shift_within_word, shift_to_word, shift; + /* How to shift the value to BIT0 of the word. */ + shift_to_word = total_length - (word_offset + word_length); + + /* How to shift the value to the field within the word. */ if (CGEN_INSN_LSB0_P) - shift = (word_offset + start + 1) - length; + shift_within_word = start + 1 - length; else - shift = total_length - (word_offset + start + length); + shift_within_word = word_length - start - length; + + /* The total SHIFT, then mask in the value. */ + shift = shift_to_word + shift_within_word; *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); } diff --git a/opcodes/ip2k-ibld.c b/opcodes/ip2k-ibld.c index a46e34d7be..fa6a736b06 100644 --- a/opcodes/ip2k-ibld.c +++ b/opcodes/ip2k-ibld.c @@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd, #if CGEN_INT_INSN_P { - int shift; + int shift_within_word, shift_to_word, shift; + /* How to shift the value to BIT0 of the word. */ + shift_to_word = total_length - (word_offset + word_length); + + /* How to shift the value to the field within the word. */ if (CGEN_INSN_LSB0_P) - shift = (word_offset + start + 1) - length; + shift_within_word = start + 1 - length; else - shift = total_length - (word_offset + start + length); + shift_within_word = word_length - start - length; + + /* The total SHIFT, then mask in the value. */ + shift = shift_to_word + shift_within_word; *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); } diff --git a/opcodes/iq2000-ibld.c b/opcodes/iq2000-ibld.c index 74aa4da16a..96faa3847a 100644 --- a/opcodes/iq2000-ibld.c +++ b/opcodes/iq2000-ibld.c @@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd, #if CGEN_INT_INSN_P { - int shift; + int shift_within_word, shift_to_word, shift; + /* How to shift the value to BIT0 of the word. */ + shift_to_word = total_length - (word_offset + word_length); + + /* How to shift the value to the field within the word. */ if (CGEN_INSN_LSB0_P) - shift = (word_offset + start + 1) - length; + shift_within_word = start + 1 - length; else - shift = total_length - (word_offset + start + length); + shift_within_word = word_length - start - length; + + /* The total SHIFT, then mask in the value. */ + shift = shift_to_word + shift_within_word; *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); } diff --git a/opcodes/lm32-ibld.c b/opcodes/lm32-ibld.c index 6a923c7a2f..784acc02be 100644 --- a/opcodes/lm32-ibld.c +++ b/opcodes/lm32-ibld.c @@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd, #if CGEN_INT_INSN_P { - int shift; + int shift_within_word, shift_to_word, shift; + /* How to shift the value to BIT0 of the word. */ + shift_to_word = total_length - (word_offset + word_length); + + /* How to shift the value to the field within the word. */ if (CGEN_INSN_LSB0_P) - shift = (word_offset + start + 1) - length; + shift_within_word = start + 1 - length; else - shift = total_length - (word_offset + start + length); + shift_within_word = word_length - start - length; + + /* The total SHIFT, then mask in the value. */ + shift = shift_to_word + shift_within_word; *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); } diff --git a/opcodes/m32c-ibld.c b/opcodes/m32c-ibld.c index b93de263f6..7066bbf2ae 100644 --- a/opcodes/m32c-ibld.c +++ b/opcodes/m32c-ibld.c @@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd, #if CGEN_INT_INSN_P { - int shift; + int shift_within_word, shift_to_word, shift; + /* How to shift the value to BIT0 of the word. */ + shift_to_word = total_length - (word_offset + word_length); + + /* How to shift the value to the field within the word. */ if (CGEN_INSN_LSB0_P) - shift = (word_offset + start + 1) - length; + shift_within_word = start + 1 - length; else - shift = total_length - (word_offset + start + length); + shift_within_word = word_length - start - length; + + /* The total SHIFT, then mask in the value. */ + shift = shift_to_word + shift_within_word; *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); } diff --git a/opcodes/m32r-ibld.c b/opcodes/m32r-ibld.c index a1bbcef8bc..2b9e93a901 100644 --- a/opcodes/m32r-ibld.c +++ b/opcodes/m32r-ibld.c @@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd, #if CGEN_INT_INSN_P { - int shift; + int shift_within_word, shift_to_word, shift; + /* How to shift the value to BIT0 of the word. */ + shift_to_word = total_length - (word_offset + word_length); + + /* How to shift the value to the field within the word. */ if (CGEN_INSN_LSB0_P) - shift = (word_offset + start + 1) - length; + shift_within_word = start + 1 - length; else - shift = total_length - (word_offset + start + length); + shift_within_word = word_length - start - length; + + /* The total SHIFT, then mask in the value. */ + shift = shift_to_word + shift_within_word; *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); } diff --git a/opcodes/mep-ibld.c b/opcodes/mep-ibld.c index d1e33fa730..0faf9481d9 100644 --- a/opcodes/mep-ibld.c +++ b/opcodes/mep-ibld.c @@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd, #if CGEN_INT_INSN_P { - int shift; + int shift_within_word, shift_to_word, shift; + /* How to shift the value to BIT0 of the word. */ + shift_to_word = total_length - (word_offset + word_length); + + /* How to shift the value to the field within the word. */ if (CGEN_INSN_LSB0_P) - shift = (word_offset + start + 1) - length; + shift_within_word = start + 1 - length; else - shift = total_length - (word_offset + start + length); + shift_within_word = word_length - start - length; + + /* The total SHIFT, then mask in the value. */ + shift = shift_to_word + shift_within_word; *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); } diff --git a/opcodes/mt-ibld.c b/opcodes/mt-ibld.c index ffc7910d6e..c678e99695 100644 --- a/opcodes/mt-ibld.c +++ b/opcodes/mt-ibld.c @@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd, #if CGEN_INT_INSN_P { - int shift; + int shift_within_word, shift_to_word, shift; + /* How to shift the value to BIT0 of the word. */ + shift_to_word = total_length - (word_offset + word_length); + + /* How to shift the value to the field within the word. */ if (CGEN_INSN_LSB0_P) - shift = (word_offset + start + 1) - length; + shift_within_word = start + 1 - length; else - shift = total_length - (word_offset + start + length); + shift_within_word = word_length - start - length; + + /* The total SHIFT, then mask in the value. */ + shift = shift_to_word + shift_within_word; *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); } diff --git a/opcodes/or1k-ibld.c b/opcodes/or1k-ibld.c index 040bd00bac..b934ce1b9f 100644 --- a/opcodes/or1k-ibld.c +++ b/opcodes/or1k-ibld.c @@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd, #if CGEN_INT_INSN_P { - int shift; + int shift_within_word, shift_to_word, shift; + /* How to shift the value to BIT0 of the word. */ + shift_to_word = total_length - (word_offset + word_length); + + /* How to shift the value to the field within the word. */ if (CGEN_INSN_LSB0_P) - shift = (word_offset + start + 1) - length; + shift_within_word = start + 1 - length; else - shift = total_length - (word_offset + start + length); + shift_within_word = word_length - start - length; + + /* The total SHIFT, then mask in the value. */ + shift = shift_to_word + shift_within_word; *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); } diff --git a/opcodes/xc16x-ibld.c b/opcodes/xc16x-ibld.c index 3deb3b0241..43c7a160e2 100644 --- a/opcodes/xc16x-ibld.c +++ b/opcodes/xc16x-ibld.c @@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd, #if CGEN_INT_INSN_P { - int shift; + int shift_within_word, shift_to_word, shift; + /* How to shift the value to BIT0 of the word. */ + shift_to_word = total_length - (word_offset + word_length); + + /* How to shift the value to the field within the word. */ if (CGEN_INSN_LSB0_P) - shift = (word_offset + start + 1) - length; + shift_within_word = start + 1 - length; else - shift = total_length - (word_offset + start + length); + shift_within_word = word_length - start - length; + + /* The total SHIFT, then mask in the value. */ + shift = shift_to_word + shift_within_word; *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); } diff --git a/opcodes/xstormy16-ibld.c b/opcodes/xstormy16-ibld.c index 4d963945c8..2d05229ba6 100644 --- a/opcodes/xstormy16-ibld.c +++ b/opcodes/xstormy16-ibld.c @@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd, #if CGEN_INT_INSN_P { - int shift; + int shift_within_word, shift_to_word, shift; + /* How to shift the value to BIT0 of the word. */ + shift_to_word = total_length - (word_offset + word_length); + + /* How to shift the value to the field within the word. */ if (CGEN_INSN_LSB0_P) - shift = (word_offset + start + 1) - length; + shift_within_word = start + 1 - length; else - shift = total_length - (word_offset + start + length); + shift_within_word = word_length - start - length; + + /* The total SHIFT, then mask in the value. */ + shift = shift_to_word + shift_within_word; *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); }