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qemu.20361
0360-sm501-Shorten-long-variable-names-i.patch
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File 0360-sm501-Shorten-long-variable-names-i.patch of Package qemu.20361
From: BALATON Zoltan <balaton@eik.bme.hu> Date: Thu, 21 May 2020 21:39:44 +0200 Subject: sm501: Shorten long variable names in sm501_2d_operation Git-commit: 6f8183b5dc5b309378687830a25e85ea8fb860ea References: bsc#1172385, CVE-2020-12829 This increases readability and cleans up some confusing naming. Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu> Message-id: b9b67b94c46e945252a73c77dfd117132c63c4fb.1590089984.git.balaton@eik.bme.hu Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Bruce Rogers <brogers@suse.com> --- hw/display/sm501.c | 59 +++++++++++++++++++++++----------------------- 1 file changed, 30 insertions(+), 29 deletions(-) diff --git a/hw/display/sm501.c b/hw/display/sm501.c index a5322df7a2add530c398472be640..9ee86ab368dcfe694036a56bbae6 100644 --- a/hw/display/sm501.c +++ b/hw/display/sm501.c @@ -666,17 +666,16 @@ static inline void hwc_invalidate(SM501State *s, int crt) static void sm501_2d_operation(SM501State * s) { /* obtain operation parameters */ - int operation = (s->twoD_control >> 16) & 0x1f; + int cmd = (s->twoD_control >> 16) & 0x1F; int rtl = s->twoD_control & 0x8000000; int src_x = (s->twoD_source >> 16) & 0x01FFF; int src_y = s->twoD_source & 0xFFFF; int dst_x = (s->twoD_destination >> 16) & 0x01FFF; int dst_y = s->twoD_destination & 0xFFFF; - int operation_width = (s->twoD_dimension >> 16) & 0x1FFF; - int operation_height = s->twoD_dimension & 0xFFFF; + int width = (s->twoD_dimension >> 16) & 0x1FFF; + int height = s->twoD_dimension & 0xFFFF; uint32_t color = s->twoD_foreground; - int format_flags = (s->twoD_stretch >> 20) & 0x3; - int addressing = (s->twoD_stretch >> 16) & 0xF; + int format = (s->twoD_stretch >> 20) & 0x3; int rop_mode = (s->twoD_control >> 15) & 0x1; /* 1 for rop2, else rop3 */ /* 1 if rop2 source is the pattern, otherwise the source is the bitmap */ int rop2_source_is_pattern = (s->twoD_control >> 14) & 0x1; @@ -687,12 +686,12 @@ static void sm501_2d_operation(SM501State * s) /* get frame buffer info */ uint8_t *src = s->local_mem + src_base; uint8_t *dst = s->local_mem + dst_base; - int src_width = s->twoD_pitch & 0x1FFF; - int dst_width = (s->twoD_pitch >> 16) & 0x1FFF; + int src_pitch = s->twoD_pitch & 0x1FFF; + int dst_pitch = (s->twoD_pitch >> 16) & 0x1FFF; int crt = (s->dc_crt_control & SM501_DC_CRT_CONTROL_SEL) ? 1 : 0; int fb_len = get_width(s, crt) * get_height(s, crt) * get_bpp(s, crt); - if (addressing != 0x0) { + if ((s->twoD_stretch >> 16) & 0xF) { qemu_log_mask(LOG_UNIMP, "sm501: only XY addressing is supported.\n"); return; } @@ -724,19 +723,21 @@ static void sm501_2d_operation(SM501State * s) return; } - switch (operation) { + switch (cmd) { case 0x00: /* copy area */ -#define COPY_AREA(_bpp, _pixel_type, rtl) { \ - int y, x, index_d, index_s; \ - for (y = 0; y < operation_height; y++) { \ - for (x = 0; x < operation_width; x++) { \ - if (rtl) { \ - index_s = ((src_y - y) * src_width + src_x - x) * _bpp; \ - index_d = ((dst_y - y) * dst_width + dst_x - x) * _bpp; \ - } else { \ - index_s = ((src_y + y) * src_width + src_x + x) * _bpp; \ - index_d = ((dst_y + y) * dst_width + dst_x + x) * _bpp; \ - } \ +#define COPY_AREA(_bpp, _pixel_type, rtl) { \ + int y, x, index_d, index_s; \ + for (y = 0; y < height; y++) { \ + for (x = 0; x < width; x++) { \ + _pixel_type val; \ + \ + if (rtl) { \ + index_s = ((src_y - y) * src_pitch + src_x - x) * _bpp; \ + index_d = ((dst_y - y) * dst_pitch + dst_x - x) * _bpp; \ + } else { \ + index_s = ((src_y + y) * src_pitch + src_x + x) * _bpp; \ + index_d = ((dst_y + y) * dst_pitch + dst_x + x) * _bpp; \ + } \ if (rop_mode == 1 && rop == 5) { \ /* Invert dest */ \ val = ~*(_pixel_type *)&dst[index_d]; \ @@ -747,7 +748,7 @@ static void sm501_2d_operation(SM501State * s) } \ } \ } - switch (format_flags) { + switch (format) { case 0: COPY_AREA(1, uint8_t, rtl); break; @@ -763,15 +764,15 @@ static void sm501_2d_operation(SM501State * s) case 0x01: /* fill rectangle */ #define FILL_RECT(_bpp, _pixel_type) { \ int y, x; \ - for (y = 0; y < operation_height; y++) { \ - for (x = 0; x < operation_width; x++) { \ - int index = ((dst_y + y) * dst_width + dst_x + x) * _bpp; \ - *(_pixel_type*)&dst[index] = (_pixel_type)color; \ + for (y = 0; y < height; y++) { \ + for (x = 0; x < width; x++) { \ + int index = ((dst_y + y) * dst_pitch + dst_x + x) * _bpp; \ + *(_pixel_type *)&dst[index] = (_pixel_type)color; \ } \ } \ } - switch (format_flags) { + switch (format) { case 0: FILL_RECT(1, uint8_t); break; @@ -788,14 +789,14 @@ static void sm501_2d_operation(SM501State * s) default: qemu_log_mask(LOG_UNIMP, "sm501: not implemented 2D operation: %d\n", - operation); + cmd); return; } if (dst_base >= get_fb_addr(s, crt) && dst_base <= get_fb_addr(s, crt) + fb_len) { - int dst_len = MIN(fb_len, ((dst_y + operation_height - 1) * dst_width + - dst_x + operation_width) * (1 << format_flags)); + int dst_len = MIN(fb_len, ((dst_y + height - 1) * dst_pitch + + dst_x + width) * (1 << format)); if (dst_len) { memory_region_set_dirty(&s->local_mem_region, dst_base, dst_len); }
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