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annotate toolchain/binutils-patches/elf32-arm.patch @ 1014:961efadd530a default tip

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fc-shell TCH DL handler: add support for CSD modes TCH DL capture mechanism in FC Tourmaline firmware has been extended to support CSD modes in addition to speech - add the necessary support on the host tools side. It needs to be noted that this mechanism in its present state does NOT provide the debug utility value that was sought: as we learned only after the code was implemented, TI's DSP has a misfeature in that the buffer we are reading (a_dd_0[]) is zeroed out when the IDS block is enabled, i.e., we are reading all zeros and not the real DL bits we were after. But since the code has already been written, we are keeping it - perhaps we can do some tests with IDS disabled.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 26 Nov 2024 06:27:43 +0000
parents e7502631a0f9
children
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1 # The present patch to the ARM ELF linking code in binutils (made against
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2 # binutils-2.21.1a) is a hack that affects the generation of Thumb->ARM
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3 # call veneers. The binutils linker can make these veneers in two forms:
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4 #
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5 # "Short" "Long"
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6 # (16-bit) bx pc (16-bit) bx pc
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7 # (16-bit) nop (16-bit) nop
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8 # (32-bit) b dest (32-bit) ldr pc, [pc, #-4]
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9 # (32-bit) .long target
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10 #
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11 # For code that's going to run on the Calypso ARM7 processor, the
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12 # "short" form is the one we want: because of the way the address space
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13 # is laid out, the range of an ARM branch instruction will always be
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14 # sufficient for us, whereas the long version is more costly in terms
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15 # of the number of cycles required, especially when executing from
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16 # external memory.
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17 #
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18 # Unfortunately, the code which decides between these two forms
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19 # (located in the arm_type_of_stub() function in bfd/elf32-arm.c)
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20 # is broken. The original code (which you can see below in the
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21 # "before" part of the patch hunk) exhibits two problems:
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22 #
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23 # 1. The distance that matters here is not from the original
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24 # call point to the destination, but from the stub to
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25 # the destination - and in this function we don't know
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26 # where the stub will end up.
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27 #
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28 # 2. Because it's an ARM branch, the limits should be
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29 # ARM_MAX_[BF]WD_BRANCH_OFFSET, not the THM_ ones.
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30 #
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31 # The 2nd problem would be trivial to fix, but the 1st one
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32 # much less so: this function doesn't know where the stub
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33 # will end up, and considering that for the present purpose
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34 # of the FreeCalypso project always emitting the "short"
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35 # version would be perfect, there is no justification for
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36 # expending the time and effort to restructure the linker
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37 # to do the proper relaxation for the case at hand.
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38 #
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39 # Therefore, the patch we apply is a hack: we simply force the
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40 # use of the "short" form unconditionally.
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41
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42 *** elf32-arm.c Wed May 11 07:29:12 2011
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43 --- elf32-arm-patched.c Mon Aug 19 03:24:38 2013
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44 ***************
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45 *** 3203,3211 ****
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46 : arm_stub_long_branch_v4t_thumb_arm);
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47
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48 /* Handle v4t short branches. */
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49 ! if ((stub_type == arm_stub_long_branch_v4t_thumb_arm)
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50 ! && (branch_offset <= THM_MAX_FWD_BRANCH_OFFSET)
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51 ! && (branch_offset >= THM_MAX_BWD_BRANCH_OFFSET))
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52 stub_type = arm_stub_short_branch_v4t_thumb_arm;
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53 }
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54 }
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55 --- 3203,3209 ----
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56 : arm_stub_long_branch_v4t_thumb_arm);
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57
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58 /* Handle v4t short branches. */
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59 ! if (stub_type == arm_stub_long_branch_v4t_thumb_arm)
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60 stub_type = arm_stub_short_branch_v4t_thumb_arm;
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61 }
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62 }