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e32831033a
* On S3, the placement of ROM functions is ECO-dependent. Hence, we don't jump into the middle of the longjmp function in ROM on S3 anymore. Instead, the whole longjump function is used in the patch. * Also properly excluded the patch from bootloader build with Makefiles Closes IDF-3391
150 lines
4.5 KiB
ArmAsm
150 lines
4.5 KiB
ArmAsm
/*
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Copyright (c) 2001-2006 by Tensilica Inc.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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This file contains a modified version of the original Xtensa longjmp implementation.
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In this modified version, setting WINDOWSTART = 1 << WINDOWBASE is done inside a critical section.
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This is necessary because after a FreeRTOS context switch in IDF, the values of WINDOWBASE and WINDOWSTART
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are not guaranteed to be the same as before the context switch.
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*/
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#include <xtensa/corebits.h>
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#include <sdkconfig.h>
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/* void longjmp (jmp_buf env, int val) */
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.align 4
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.literal_position
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.global __wrap_longjmp
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.type __wrap_longjmp, @function
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__wrap_longjmp:
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entry sp, 16
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/* Deactivate interrupts in order to modify WINDOWBASE and WINDOWSTART. */
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rsr a7, PS /* to be restored after SPILL_ALL_WINDOWS */
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movi a5, PS_EXCM /* PS_INTLEVEL_MASK */
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or a5, a7, a5 /* get the current INTLEVEL */
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wsr a5, PS
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/* Invalidate all but the current window;
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set WindowStart to (1 << WindowBase). */
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rsr a5, WINDOWBASE
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movi a4, 1
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ssl a5
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sll a4, a4
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wsr a4, WINDOWSTART
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rsync
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/* Activate interrupts again after modifying WINDOWBASE and WINDOWSTART. */
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wsr a7, PS
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#if !CONFIG_IDF_TARGET_ESP32S3
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/*
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If not on S3, replacement of only the first instructions,
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then jump back to original longjmp implementation.
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The jump target is the instrucion
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l32i a0, a2, 64
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of the original code. Hence, the original code's entry instruction and windowstart modification are left
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out.
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*/
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movi a0, __real_longjmp + 20
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jx a0
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.size __wrap_longjmp, . - __wrap_longjmp
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#else /* CONFIG_IDF_TARGET_ESP32S3 */
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/*
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If on S3, we replace the whole function for simplicity. The placement of longjmp in ROM is ECO-dependent
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on S3.
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*/
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/*
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Return to the return address of the setjmp, using the
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window size bits from the setjmp call so that the caller
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will be able to find the return value that we put in a2. */
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l32i a0, a2, 64
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/* Copy the first 4 saved registers from jmp_buf into the save area
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at the current sp so that the values will be restored to registers
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when longjmp returns. */
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addi a7, a1, -16
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l32i a4, a2, 0
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l32i a5, a2, 4
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s32i a4, a7, 0
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s32i a5, a7, 4
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l32i a4, a2, 8
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l32i a5, a2, 12
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s32i a4, a7, 8
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s32i a5, a7, 12
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/* Copy the remaining 0-8 saved registers. */
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extui a7, a0, 30, 2
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blti a7, 2, .Lendlj
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l32i a8, a2, 52
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slli a4, a7, 4
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sub a6, a8, a4
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addi a5, a2, 16
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addi a8, a8, -16 // a8 = end of register overflow area
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.Lljloop:
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l32i a7, a5, 0
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l32i a4, a5, 4
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s32i a7, a6, 0
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s32i a4, a6, 4
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l32i a7, a5, 8
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l32i a4, a5, 12
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s32i a7, a6, 8
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s32i a4, a6, 12
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addi a5, a5, 16
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addi a6, a6, 16
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blt a6, a8, .Lljloop
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.Lendlj:
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/* The 4 words saved from the register save area at the target's
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sp are copied back to the target procedure's save area. The
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only point of this is to prevent a catastrophic failure in
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case the contents were moved by an alloca after calling
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setjmp. This is a bit paranoid but it doesn't cost much. */
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l32i a7, a2, 4 // load the target stack pointer
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addi a7, a7, -16 // find the destination save area
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l32i a4, a2, 48
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l32i a5, a2, 52
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s32i a4, a7, 0
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s32i a5, a7, 4
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l32i a4, a2, 56
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l32i a5, a2, 60
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s32i a4, a7, 8
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s32i a5, a7, 12
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/* Return val ? val : 1. */
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movi a2, 1
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movnez a2, a3, a3
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retw
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.size __wrap_longjmp, . - __wrap_longjmp
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#endif /* CONFIG_IDF_TARGET_ESP32S3 */
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