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Allow non-aligned PSTR() #7275

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merged 5 commits into from
May 18, 2020
Merged

Allow non-aligned PSTR() #7275

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6aa7c1d
Allow non-aligned PSTR()
s-hadinger May 6, 2020
f5c67d9
Merge branch 'master' into patch-2
devyte May 7, 2020
5b60cae
Add PSTR4() macro to first 4-bytes aligned PSTR
s-hadinger May 8, 2020
66b006c
Merge branch 'master' of https://github.com/esp8266/Arduino into patch-2
s-hadinger May 18, 2020
1e384b1
Merge branch 'master' into patch-2
devyte May 18, 2020
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10 changes: 7 additions & 3 deletions tools/sdk/libc/xtensa-lx106-elf/include/sys/pgmspace.h
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Original file line number Diff line number Diff line change
Expand Up @@ -31,12 +31,16 @@ extern "C" {
#define PGM_VOID_P const void *
#endif

// PSTR() macro modified to start on a 32-bit boundary. This adds on average
// 1.5 bytes/string, but in return memcpy_P and strcpy_P will work 4~8x faster
#ifndef PSTR_ALIGN
// PSTR() macro starts by default on a 32-bit boundary. This adds on average
// 1.5 bytes/string, but in return memcpy_P and strcpy_P will work 4~8x faster
// Allow users to override the alignment with PSTR_ALIGN
#define PSTR_ALIGN 4
#endif
#ifndef PSTR
// Adapted from AVR-specific code at https://forum.arduino.cc/index.php?topic=194603.0
// Uses C attribute section instead of ASM block to allow for C language string concatenation ("x" "y" === "xy")
#define PSTR(s) (__extension__({static const char __c[] __attribute__((__aligned__(4))) __attribute__((section( "\".irom0.pstr." __FILE__ "." __STRINGIZE(__LINE__) "." __STRINGIZE(__COUNTER__) "\", \"aSM\", @progbits, 1 #"))) = (s); &__c[0];}))
#define PSTR(s) (__extension__({static const char __c[] __attribute__((__aligned__(PSTR_ALIGN))) __attribute__((section( "\".irom0.pstr." __FILE__ "." __STRINGIZE(__LINE__) "." __STRINGIZE(__COUNTER__) "\", \"aSM\", @progbits, 1 #"))) = (s); &__c[0];}))
#endif

// Flash memory must be read using 32 bit aligned addresses else a processor
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